You searched for subject:(Thermal management).
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Texas A&M University
1.
Yeo, In Choon.
Design and Analysis of Dynamic Thermal Management in Chip Multiprocessors (CMPs).
Degree: PhD, Computer Science, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7596 
► Chip Multiprocessors (CMPs) have been prevailing in the modern microprocessor market. As the significant heat is converted by the ever-increasing power density and current leakage,…
(more)
▼ Chip Multiprocessors (CMPs) have been prevailing in the modern microprocessor
market. As the significant heat is converted by the ever-increasing power density and
current leakage, the raised operating temperature in a chip has already threatened
the system?s reliability and led the
thermal control to be one of the most important
issues needed to be addressed immediately in chip designs. Due to the cost and
complexity of designing
thermal packaging, many Dynamic
Thermal Management
(DTM) schemes have been widely adopted in modern processors.
In this study, we focus on developing a simple and accurate
thermal model,
which provides a scheduling decision for running tasks. And we show how to design
an efficient DTM scheme with negligible performance overhead. First, we propose an
efficient DTM scheme for multimedia applications that tackles the
thermal control
problem in a unified manner. A DTM scheme for multimedia applications makes soft
realtime scheduling decisions based on statistical characteristics of multimedia applications.
Specifically, we model application execution characteristics as the probability
distribution of the number of cycles required to decode frames. Our DTM scheme
for multimedia applications has been implemented on Linux in two mobile processors
providing variable clock frequencies in an Intel Pentium-M processor and an Intel Atom processor. In order to evaluate the performance of the proposed DTM scheme,
we exploit two major codecs, MPEG-4 and H.264/AVC based on various frame resolutions.
Our results show that our DTM scheme for multimedia applications lowers
the overall temperature by 4 degrees C and the peak temperature by 6 degrees C (up to 10 degrees C),
while maintaining frame drop ratio under 5% compared to existing DTM schemes
for multimedia applications. Second, we propose a lightweight online workload estimation
using the cumulative distribution function and architectural information via
Performance Monitoring Counters (PMC) to observe the processes dynamic workload
behaviors. We also present an accurate
thermal model for CMP architectures to analyze
the
thermal correlation effects by profiling the
thermal impacts from neighboring
cores under the specific workload. Hence, according to the estimated workload characteristics
and
thermal correlation effects, we can estimate the future temperature of
each core more accurately.
We implement a DTM scheme considering workload characteristics and
thermal
correlation effects on real machines, an Intel Quad-Core Q6600 system and Dell
PowerEdge 2950 (dual Intel Xeon E5310 Quad-Core) system, running applications
ranging from multimedia applications to several benchmarks. Experiments results
show that our DTM scheme reduces the peak temperature by 8% with 0.54% performance
overhead compared to Linux Standard Scheduler, while existing DTM schemes
reduce peak temperature by 4% with up to 50% performance overhead.
Advisors/Committee Members: Kim, Eun Jung (advisor), Taylor, Valerie E. (committee member), Walker, Hank (committee member), Li, Peng (committee member).
Subjects/Keywords: Dynamic Thermal Management
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APA (6th Edition):
Yeo, I. C. (2011). Design and Analysis of Dynamic Thermal Management in Chip Multiprocessors (CMPs). (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7596
Chicago Manual of Style (16th Edition):
Yeo, In Choon. “Design and Analysis of Dynamic Thermal Management in Chip Multiprocessors (CMPs).” 2011. Doctoral Dissertation, Texas A&M University. Accessed January 22, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7596.
MLA Handbook (7th Edition):
Yeo, In Choon. “Design and Analysis of Dynamic Thermal Management in Chip Multiprocessors (CMPs).” 2011. Web. 22 Jan 2021.
Vancouver:
Yeo IC. Design and Analysis of Dynamic Thermal Management in Chip Multiprocessors (CMPs). [Internet] [Doctoral dissertation]. Texas A&M University; 2011. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7596.
Council of Science Editors:
Yeo IC. Design and Analysis of Dynamic Thermal Management in Chip Multiprocessors (CMPs). [Doctoral Dissertation]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7596
2.
Cochran, Ryan James.
Techniques for Adaptive Power and Thermal Sensing and
Management of Multi-core Processors.
Degree: PhD, Electrical Science and Computer
Engineering, 2013, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:320477/
► In the past decade, power consumption has become the primary factor in overall microprocessor design complexity due to ideal geometric scaling and non-ideal electrical scaling.…
(more)
▼ In the past decade, power consumption has become the
primary factor in overall microprocessor design complexity due to
ideal geometric scaling and non-ideal electrical scaling. Nearly
all modern microprocessors are equipped with power “control knobs”
and manage the tradeoff between performance and power via dynamic
power
management (DPM) and dynamic
thermal management (DTM). This
thesis is concerned with two primary questions: (1) How can the
system supply accurate power and
thermal measurements to DPM and
DTM controllers using a limited number of sensors? And (2) How can
the system perform adaptive workload-sensitive DPM and DTM using
the measurements available at runtime?
With respect to the first question, we show that the problem
formulation for
thermal sensor placement is NP-hard and accordingly
we propose a heuristic solution composed of a constructive and
iterative phase. We demonstrate improved
thermal estimation
accuracy over sensor placement techniques proposed in the
literature. We then propose two soft sensing techniques with
different tradeoffs that combine the measurements of physical
sensors to estimate the temperatures at remote die locations, thus
enhancing
thermal estimation accuracy. All verification is
performed on a real microprocessor using our state-of-the-art
thermal imaging system.
With respect to the second question, we devise Pack &
Cap, which is a novel control technique designed to make adaptive
dynamic voltage frequency (DVFS) and thread packing control
decisions for multithreaded workloads such that performance is
maximized within an individual server power cap. We compare three
proposed modeling techniques to a baseline feedback technique and
demonstrate up to 10% reduction in average runtime and up to 53%
improvement in average power cap accuracy.
We then introduce a novel technique for estimating the
temperature control response that uses the concept of workload
phases to automatically capture the nonlinearities that are
inherent to
thermal modeling. We demonstrate this technique in
proactive DTM on a real system using DVFS. We compare to
state-of-the-art model predictive control (MPC) techniques in the
literature and show 5.8% improvement in instruction throughput with
the same number of
thermal violations.
Advisors/Committee Members: Reda, Sherief (Director), Bahar, Ruth (Reader), Felzenszwalb, Pedro (Reader).
Subjects/Keywords: dynamic thermal management
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APA (6th Edition):
Cochran, R. J. (2013). Techniques for Adaptive Power and Thermal Sensing and
Management of Multi-core Processors. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:320477/
Chicago Manual of Style (16th Edition):
Cochran, Ryan James. “Techniques for Adaptive Power and Thermal Sensing and
Management of Multi-core Processors.” 2013. Doctoral Dissertation, Brown University. Accessed January 22, 2021.
https://repository.library.brown.edu/studio/item/bdr:320477/.
MLA Handbook (7th Edition):
Cochran, Ryan James. “Techniques for Adaptive Power and Thermal Sensing and
Management of Multi-core Processors.” 2013. Web. 22 Jan 2021.
Vancouver:
Cochran RJ. Techniques for Adaptive Power and Thermal Sensing and
Management of Multi-core Processors. [Internet] [Doctoral dissertation]. Brown University; 2013. [cited 2021 Jan 22].
Available from: https://repository.library.brown.edu/studio/item/bdr:320477/.
Council of Science Editors:
Cochran RJ. Techniques for Adaptive Power and Thermal Sensing and
Management of Multi-core Processors. [Doctoral Dissertation]. Brown University; 2013. Available from: https://repository.library.brown.edu/studio/item/bdr:320477/
Delft University of Technology
3.
van Wees, Tim (author).
Thermal Modelling & Analysis of the Deployable Space Telescope.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:f698fca7-205b-487d-b521-83d7f85e6fef
► The Deployable Space Telescope (DST) project aims at producing a competitive telescope by using segmented deployable light weighted optics which reduces launch volume and mass,…
(more)
▼ The Deployable Space Telescope (DST) project aims at producing a competitive telescope by using segmented deployable light weighted optics which reduces launch volume and mass, and thus launch costs. Due to the criticality of heat
management to the performance of the telescope, a
thermal model had to be built in order to determine the expected temperatures throughout the telescope in orbit. Further, the premature baffle design required a supportive
thermal analysis such that its critical parameters could be determined.
Advisors/Committee Members: Kuiper, Hans (mentor), Zandbergen, Barry (graduation committee), Naeije, Marc (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Thermal; Thermal analysis; Thermal management; Thermal control; Space telescope; ESATAN TMS
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APA (6th Edition):
van Wees, T. (. (2019). Thermal Modelling & Analysis of the Deployable Space Telescope. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f698fca7-205b-487d-b521-83d7f85e6fef
Chicago Manual of Style (16th Edition):
van Wees, Tim (author). “Thermal Modelling & Analysis of the Deployable Space Telescope.” 2019. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:f698fca7-205b-487d-b521-83d7f85e6fef.
MLA Handbook (7th Edition):
van Wees, Tim (author). “Thermal Modelling & Analysis of the Deployable Space Telescope.” 2019. Web. 22 Jan 2021.
Vancouver:
van Wees T(. Thermal Modelling & Analysis of the Deployable Space Telescope. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:f698fca7-205b-487d-b521-83d7f85e6fef.
Council of Science Editors:
van Wees T(. Thermal Modelling & Analysis of the Deployable Space Telescope. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:f698fca7-205b-487d-b521-83d7f85e6fef
Georgia Tech
4.
VanDerheyden, Andrew Louis.
Characterization of thermal coupling in chip multiprocessors.
Degree: MS, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/51892
► For semiconductor processors temperature increases leakage current, which in turn in- creases the temperature of the processor. This increase in heat is seen by other…
(more)
▼ For semiconductor processors temperature increases leakage current, which in turn in- creases the temperature of the processor. This increase in heat is seen by other parts of the processor since heat is diffusive across a processor die. In this way, cores are thermally coupled to one another such that when the temperature of one core increases, the temperatures of all cores on the same die can also increase. This increase in temperature and power consumption is not accompanied by any increase in performance. Cores on a chip can also be performance coupled to one another since cores can share data between them. These interactions between cores present new challenges to microarchitects who seek to optimize the energy consumption of a chip multiprocessor (CMP) comprised of multiple symmetric or asymmetric processing cores. This thesis seeks to understand and model the impact of
thermal coupling effects between adjacent cores in a chip multiprocessor starting with measurements with a commercial multi-core processor. The hypothesis is that the
thermal coupling of compute cores will be influenced by the adjacent core’s performance characteristics. Specifically, we expect
thermal coupling is related to the nature of the workloads, e.g. compute intensive workloads will increase coupling over memory intensive workloads. However, we find that simpler parameters such as frequency of operation have more impact on coupling behaviors than the workload behaviors such as memory intensity or instruction retirement rates. A model is developed to capture
thermal coupling effects and enable schemes to mitigate its impact.
Advisors/Committee Members: Yalamanchili, Sudhakar (advisor), Mukhopadhyay, Saibal (committee member), Conte, Thomas (committee member).
Subjects/Keywords: Thermal management; Thermal characterization; Thermal coupling; High performance processors; Thermal analysis
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APA (6th Edition):
VanDerheyden, A. L. (2014). Characterization of thermal coupling in chip multiprocessors. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/51892
Chicago Manual of Style (16th Edition):
VanDerheyden, Andrew Louis. “Characterization of thermal coupling in chip multiprocessors.” 2014. Masters Thesis, Georgia Tech. Accessed January 22, 2021.
http://hdl.handle.net/1853/51892.
MLA Handbook (7th Edition):
VanDerheyden, Andrew Louis. “Characterization of thermal coupling in chip multiprocessors.” 2014. Web. 22 Jan 2021.
Vancouver:
VanDerheyden AL. Characterization of thermal coupling in chip multiprocessors. [Internet] [Masters thesis]. Georgia Tech; 2014. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1853/51892.
Council of Science Editors:
VanDerheyden AL. Characterization of thermal coupling in chip multiprocessors. [Masters Thesis]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/51892
University of Toronto
5.
Cho, Hai Jun.
Thermal conductivity of bulk electrodeposited metal-diamond composite materials for thermal management applications.
Degree: PhD, 2018, University of Toronto
URL: http://hdl.handle.net/1807/89817
► This Ph.D research examined the feasibility of using the electrodeposition approach for the fabrication of metal-diamond heat sink materials, which can potentially be more economical…
(more)
▼ This Ph.D research examined the feasibility of using the electrodeposition approach for the fabrication of metal-diamond heat sink materials, which can potentially be more economical compared to conventional high-temperature-high-pressure(HTHP) methods. This research also explored the heat exchange between metal and diamond, which have different major heat carriers. Initially, the
thermal properties of electrodeposited metal-diamond composite materials as well as the implementation of structure-induced strengthening were of interest in this research. For this reason, the effect of the matrix grain size on the
thermal and electrical conductivity of electrodeposited nickel was explored. The
thermal conductivity of nickel monotonically decreased from 75W/mK to 67W/mK when the grain size changed from 47nm to 28nm. In the same grain size range, the electrical conductivity also decreased from 10.6 MS/m to 9.8 MS/m. The overall conductivity reductions are attributed to the additional scattering events at the grain boundaries. However, the grain boundary effect did not change the Lorenz numbers of the nanocrystalline nickel materials, which were ~2.35x10
-8W.Ohm/K
2. This agrees with the Wiedemann-Franz law and implies that the electrons are the major heat carriers in nanocrystalline nickel. Secondly, 66 um sized diamond particles were incorporated in the nickel matrix.
Thermal conductivity enhancements were observed in polycrystalline(~600nm) nickel from 89W/mK to 129W/mK at 35.4 vol.% diamond, and 77W/mK to 200W/mK at 59.8 vol.% diamond for
nanocrystalline nickel(~40nm), which provided the proof of concept in this research. Analysis of these data with the differential effective medium(DEM) model showed that the
thermal boundary conductance of the polycrystalline nickel-diamond interface(7.5 MW/m
2K) was higher than the nanocrystalline nickel-diamond interface(6.6 MW/m
2K). This is likely related to the phonon transmission probability
reduction due to extra grain boundary scattering. Lastly, the diamond particles were incorporated in electroplated copper matrix for achieving high
thermal conductivity. Two different sized diamond particles were used: 66um and 420um. Surprisingly, only the 420um sized diamond particles exhibited an increase in the
thermal conductivity, reaching 454W/mK at 68.2 vol.%. With TiC coated 394um sized diamond particles and electrodeposition process optimization, the conductivity was further increased to 557W/mK at 34.8 diamond vol.%, which is comparable with current commercial HTHP metal-diamond composite heat sinks.
Advisors/Committee Members: Uwe, Erb, Materials Science and Engineering.
Subjects/Keywords: Composite materials; Thermal conductivity; Thermal management; 0537
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APA (6th Edition):
Cho, H. J. (2018). Thermal conductivity of bulk electrodeposited metal-diamond composite materials for thermal management applications. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/89817
Chicago Manual of Style (16th Edition):
Cho, Hai Jun. “Thermal conductivity of bulk electrodeposited metal-diamond composite materials for thermal management applications.” 2018. Doctoral Dissertation, University of Toronto. Accessed January 22, 2021.
http://hdl.handle.net/1807/89817.
MLA Handbook (7th Edition):
Cho, Hai Jun. “Thermal conductivity of bulk electrodeposited metal-diamond composite materials for thermal management applications.” 2018. Web. 22 Jan 2021.
Vancouver:
Cho HJ. Thermal conductivity of bulk electrodeposited metal-diamond composite materials for thermal management applications. [Internet] [Doctoral dissertation]. University of Toronto; 2018. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1807/89817.
Council of Science Editors:
Cho HJ. Thermal conductivity of bulk electrodeposited metal-diamond composite materials for thermal management applications. [Doctoral Dissertation]. University of Toronto; 2018. Available from: http://hdl.handle.net/1807/89817
University of New Mexico
6.
Shaffer, Ryan.
Assessing Topside Thermal Solutions for Hot Spot Management of Micro-Scale Electronics.
Degree: Mechanical Engineering, 2016, University of New Mexico
URL: http://hdl.handle.net/1928/31693
► "'Thermal limitations are an increasing issue in micro-electronic performance and reliability. This study looks to address a subcategory of the issue, termed "hot spots", which…
(more)
▼ "'
Thermal limitations are an increasing issue in micro-electronic performance and reliability. This study looks to address a subcategory of the issue, termed "hot spots", which stems from large power densities contained within increasingly smaller electronic components. Topside chip integrated
thermal solutions are proposed as an approach for
thermal management of these hot spots, where carbon materials are expected to perform exceptionally well. These proposals are assessed via finite element analysis simulations, which are partially verified through electrical thermometry and infrared thermography. The simulations investigate two scenarios: (1) where a single body of material is placed atop the device to spread heat away from the electronic component, effectively cooling it. (2) where said heat-spreader is also in contact with the device package (i.e.,
thermal ground). The simulations indicate that while scenario 2 is optimal, a thick heat-spreader is of greatest consequence. A second aspect of the thesis looks into volumetric averaging in infrared thermography measurements. The approach simulates the physics of the temperature mapping technique in order to highlight the source and severity of the volumetric average based on stack
thermal emission and optical analysis. These simulations provide a means of removing the measurement averages via a bottom up approach of comparing the inputted temperature profile to the simulated temperature value. We perform these simulations on FEA model inputs, material stack dimensions, and optical properties, to produce a series of temperatures which show good agreement with the infrared thermography measurement.'"
Advisors/Committee Members: Shen, Yu-Lin, Mammoli, Andrea, Beechem, Thomas.
Subjects/Keywords: Microelectronics; Thermal Management; Infrared Thermography; Thermal Modeling
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APA (6th Edition):
Shaffer, R. (2016). Assessing Topside Thermal Solutions for Hot Spot Management of Micro-Scale Electronics. (Masters Thesis). University of New Mexico. Retrieved from http://hdl.handle.net/1928/31693
Chicago Manual of Style (16th Edition):
Shaffer, Ryan. “Assessing Topside Thermal Solutions for Hot Spot Management of Micro-Scale Electronics.” 2016. Masters Thesis, University of New Mexico. Accessed January 22, 2021.
http://hdl.handle.net/1928/31693.
MLA Handbook (7th Edition):
Shaffer, Ryan. “Assessing Topside Thermal Solutions for Hot Spot Management of Micro-Scale Electronics.” 2016. Web. 22 Jan 2021.
Vancouver:
Shaffer R. Assessing Topside Thermal Solutions for Hot Spot Management of Micro-Scale Electronics. [Internet] [Masters thesis]. University of New Mexico; 2016. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1928/31693.
Council of Science Editors:
Shaffer R. Assessing Topside Thermal Solutions for Hot Spot Management of Micro-Scale Electronics. [Masters Thesis]. University of New Mexico; 2016. Available from: http://hdl.handle.net/1928/31693
The Ohio State University
7.
Merical, Kyle I.
Model-Based Control Development for an Advanced Thermal
Management System for Automotive Powertrains.
Degree: MS, Mechanical Engineering, 2013, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1366074069
► Rising fuel prices and tightening vehicle emission regulations have led to a large demand for fuel efficient passenger vehicles. Among several design improvements and technical…
(more)
▼ Rising fuel prices and tightening vehicle emission
regulations have led to a large demand for fuel efficient passenger
vehicles. Among several design improvements and technical
solutions, advanced
Thermal Management Systems (TMS) have been
recently developed to more efficiently manage the
thermal loads
produced by internal combustion engines and thereby reduce fuel
consumption. Advanced TMS include complex networks of coolant, oil
and transmission fluid lines, heat exchangers, recuperators,
variable speed pumps and fans, as well as active fluid flow control
devices that allows for a greatly improved freedom to manage the
heat rejection and
thermal management of the engine and
transmission components. This control authority can be exploited,
for instance, to rapidly warm the powertrain fluids during vehicle
cold-starts, and then maintain them at elevated temperatures.
Increasing the temperatures of the engine oil and transmission
fluid decreases their viscosity, ultimately leading to a reduction
of the engine and transmission frictional losses, and improved fuel
economy. On the other hand, robust and accurate TMS controllers
must be developed in order to take full advantage of the additional
degrees of freedom provided by the available actuators and system
hardware configuration.To this extent, this work focuses on
developing model-based TMS controls for a prototype light-duty
automotive powertrain during fully warmed-up vehicle operation. The
design of the models and control algorithms is conducted in
parallel with the development of a prototype TMS, hence realizing a
co-design of the TMS hardware and control system. In order to
achieve this goal, first-principle models are created to
characterize the
thermal dynamics of the TMS components, and
calibrated on specific components' data. The submodels are then
integrated into a complete TMS model predicting the temperature
dynamics of the powertrain fluids in response to commands to the
available system actuators as well as operating and boundary
conditions.The developed model is then used as a tool for
model-based system analysis, optimization and control design.
Specifically, a proof-of-concept control design is conducted to
verify the feasibility of the TMS in maintaining the temperatures
of the powertrain fluids within the recommended range. In
particular, a model-based optimization is conducted to define the
open-loop actuator positions for various engine operating
conditions that maintain the coolant temperature at the desired
set-points. The open-loop strategy is then combined with a feedback
control loop that combines rule-based and PI controllers to
regulate the actuator position based on coolant temperature
tracking error, compensating for disturbances and modeling
errors.The prototype TMS controller developed in this work is shown
to be effective in reducing the fluctuations in the coolant
temperatures during the FTP driving cycle, compared to a baseline
rule-based controller. Based on the preliminary results obtained,
indications on the design of a…
Advisors/Committee Members: Canova, Marcello (Advisor).
Subjects/Keywords: Automotive Engineering; thermal management systems; thermal system control; automotive thermal management; thermal system modeling
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APA (6th Edition):
Merical, K. I. (2013). Model-Based Control Development for an Advanced Thermal
Management System for Automotive Powertrains. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1366074069
Chicago Manual of Style (16th Edition):
Merical, Kyle I. “Model-Based Control Development for an Advanced Thermal
Management System for Automotive Powertrains.” 2013. Masters Thesis, The Ohio State University. Accessed January 22, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1366074069.
MLA Handbook (7th Edition):
Merical, Kyle I. “Model-Based Control Development for an Advanced Thermal
Management System for Automotive Powertrains.” 2013. Web. 22 Jan 2021.
Vancouver:
Merical KI. Model-Based Control Development for an Advanced Thermal
Management System for Automotive Powertrains. [Internet] [Masters thesis]. The Ohio State University; 2013. [cited 2021 Jan 22].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1366074069.
Council of Science Editors:
Merical KI. Model-Based Control Development for an Advanced Thermal
Management System for Automotive Powertrains. [Masters Thesis]. The Ohio State University; 2013. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1366074069
University of Colorado
8.
Thiagarajan, Suraj Joottu.
Enhancement of Heat Transfer in Pool and Spray Boiling with Microporous Coatings.
Degree: PhD, Mechanical Engineering, 2015, University of Colorado
URL: https://scholar.colorado.edu/mcen_gradetds/100
► The relentless increase in the heat flux dissipation levels in electronic devices has necessitated development of new thermal management methods that can handle such…
(more)
▼ The relentless increase in the heat flux dissipation levels in electronic devices has necessitated development of new
thermal management methods that can handle such heat flux levels, while maintaining a low device temperature. Direct cooling of the electronic components using dielectric liquid coolants, along with phase-change heat transfer, has the potential to achieve this. In this work, the enhancement of boiling heat transfer by the use of a thermally conductive copper microporous coating with a dielectric coolant (3M Novec HFE-7100) under two configurations is studied: passive pool boiling, and spray impingement boiling.
Pool boiling experiments were performed on microporous surfaces and plain surfaces. The microporous surfaces, with coating thicknesses in the range 100 to 700 μm, and porosity of ~57%, showed a significantly lower boiling incipience temperature, enhanced the heat transfer coefficient by 50 – 270%, and enhanced the critical heat fluxes (CHF) by 33 – 60%, when compared to the plain surface. At low heat flux levels, the surface with a thicker microporous coating showed better performance than the thinner one. However, the thinner microporous coating resulted in higher CHF than the thicker surface. High-speed visualization was used to measure the nucleation site density, bubble diameter at departure, and bubble departure frequency. Based on a simple heat flux partition model, neglecting the heat transfer effects due to bubble coalescence, the individual modes of heat transfer (evaporative and single-phase) were computed. Reasonably good agreement between the partition model and the experimental data was obtained. On the plain surfaces, the evaporative and single-phase components were approximately equal, while on the microporous surfaces, the evaporative component was found to be significantly higher.
We also investigated spray boiling heat transfer performance on the microporous copper surface. Heat transfer data was measured using two full-cone spray nozzles spanning a range of volumetric flow rate from 1.1 cm
3/s to 15.8 cm
3/s, and liquid subcooling levels from 30 °C to 0 °C. The microporous surface showed an enhancement of 300% – 600% in the heat transfer coefficient at a given wall superheat compared the plain surface. The CHF also increased by up to 80%. Counterintuitively, we observed that the liquid spray at near-saturated temperature (0 °C subcooling) had higher heat transfer coefficient and CHF than the subcooled spray, on both surfaces. This likely results from the limited residence time of the liquid droplets in contact with the heater surface and the much higher efficiency of phase change heat transfer. The near-saturated spray undergoes phase change much faster than the subcooled liquid, removing heat more efficiently than the subcooled liquid. New correlations are proposed for predicting the CHF of spray impingement boiling on both plain and enhanced surfaces.
Advisors/Committee Members: Ronggui Yang, Sreekant Narumanchi, Yung-Cheng Lee, Julie Steinbrenner, Kurt Maute.
Subjects/Keywords: Thermal management; Mechanical Engineering
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APA (6th Edition):
Thiagarajan, S. J. (2015). Enhancement of Heat Transfer in Pool and Spray Boiling with Microporous Coatings. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/mcen_gradetds/100
Chicago Manual of Style (16th Edition):
Thiagarajan, Suraj Joottu. “Enhancement of Heat Transfer in Pool and Spray Boiling with Microporous Coatings.” 2015. Doctoral Dissertation, University of Colorado. Accessed January 22, 2021.
https://scholar.colorado.edu/mcen_gradetds/100.
MLA Handbook (7th Edition):
Thiagarajan, Suraj Joottu. “Enhancement of Heat Transfer in Pool and Spray Boiling with Microporous Coatings.” 2015. Web. 22 Jan 2021.
Vancouver:
Thiagarajan SJ. Enhancement of Heat Transfer in Pool and Spray Boiling with Microporous Coatings. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2021 Jan 22].
Available from: https://scholar.colorado.edu/mcen_gradetds/100.
Council of Science Editors:
Thiagarajan SJ. Enhancement of Heat Transfer in Pool and Spray Boiling with Microporous Coatings. [Doctoral Dissertation]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/mcen_gradetds/100
University of Exeter
9.
Sharma, Shivangi.
Performance enhancement of building-integrated concentrator photovoltaic system using phase change materials.
Degree: PhD, 2017, University of Exeter
URL: http://hdl.handle.net/10871/33859
► Building-integrated Concentrator Photovoltaic (BICPV) technology produces noiseless and pollution free electricity at the point of use. With a potential to contribute immensely to the increasing…
(more)
▼ Building-integrated Concentrator Photovoltaic (BICPV) technology produces noiseless and pollution free electricity at the point of use. With a potential to contribute immensely to the increasing global need for a sustainable and low carbon energy, the primary challenges such as thermal management of the panels are overwhelming. Although significant progress has been made in the solar cell efficiency increase, the concentrator photovoltaic industry has still to go a long way before it becomes competitive and economically viable. Experiencing great losses in their electrical efficiencies at high temperatures that may eventually lead to permanent degradation over time, affects the market potential severely. With a global PV installed capacity of 303 GW, a nominal 10 °C decrease in their average temperatures could theoretically lead to a 5 % electricity efficiency improvement resulting in 15 GW increase in electricity production worldwide. However, due to a gap in the research knowledge concerning the effectiveness of the available passive thermal regulation techniques both individually and working in tandem, this lucrative potential is yet to be realised. The work presented in this thesis has been focussed on incremental performance improvement of BICPV by developing innovative solutions for passive cooling of the low concentrator based BICPV. Passive cooling approaches are selected as they are generally simpler, more cost-effective and considered more reliable than active cooling. Phase Change Materials (PCM) have been considered as the primary means to achieve this. The design, fabrication and the characterisation of four different types of BIPCV-PCM assemblies are described. The experimental investigations were conducted indoors under the standard test conditions. In general, for all the fabricated and assembled BICPV-PCM systems, the electrical power output showed an increase of 2 %-17 % with the use of PCM depending on the PCM type and irradiance. The occurrence of hot spots due to thermal disequilibrium in the PV has been a cause of high degradation rates for the modules. With the use of PCM, a more uniform temperature within the module could be realised, which has the potential to extend the lifetime of the BICPV in the long-term. Consequentially, this may minimise the intensive energy required for the production of the PV cells and mitigate the associated environmental impacts. Following a parallel secondary approach to the challenge, the design of a micro-finned back plate integrated with a PCM containment has been proposed. This containment was 3D printed to save manufacturing costs and time and for reducing the PCM leakage. An organic PCM dispersed with high thermal conductivity nanomaterial was successfully tested. The cost-benefit analysis indicated that the cost per degree temperature reduction (£/°C) with the sole use of micro-fins was the highest at 1.54, followed by micro-fins + PCM at 0.23 and micro-fins + n-PCM at 0.19. The proposed use of PCM and application of micro-finned surfaces for BICPV heat…
Subjects/Keywords: 333.79; BICPV; PCM; Thermal management
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APA (6th Edition):
Sharma, S. (2017). Performance enhancement of building-integrated concentrator photovoltaic system using phase change materials. (Doctoral Dissertation). University of Exeter. Retrieved from http://hdl.handle.net/10871/33859
Chicago Manual of Style (16th Edition):
Sharma, Shivangi. “Performance enhancement of building-integrated concentrator photovoltaic system using phase change materials.” 2017. Doctoral Dissertation, University of Exeter. Accessed January 22, 2021.
http://hdl.handle.net/10871/33859.
MLA Handbook (7th Edition):
Sharma, Shivangi. “Performance enhancement of building-integrated concentrator photovoltaic system using phase change materials.” 2017. Web. 22 Jan 2021.
Vancouver:
Sharma S. Performance enhancement of building-integrated concentrator photovoltaic system using phase change materials. [Internet] [Doctoral dissertation]. University of Exeter; 2017. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10871/33859.
Council of Science Editors:
Sharma S. Performance enhancement of building-integrated concentrator photovoltaic system using phase change materials. [Doctoral Dissertation]. University of Exeter; 2017. Available from: http://hdl.handle.net/10871/33859
University of Missouri – Columbia
10.
Tessler, Bradley.
Modeling and evaluation of EML rail cooling methods through finite element analysis.
Degree: 2012, University of Missouri – Columbia
URL: http://hdl.handle.net/10355/36777
► Future naval tactical Electromagnetic Launchers (i.e. Railguns) will need to be capable of repeatedly firing six to twelve rounds per minute. Due to the 1…
(more)
▼ Future naval tactical Electromagnetic Launchers (i.e. Railguns) will need to be capable of repeatedly firing six to twelve rounds per minute. Due to the 1 - 6 MA of current flowing through the rails, an intense active cooling system must be implemented in order thermally manage the gun. To accurately account for the necessary amount of heat to be removed, a 3D Electromagnetic-
Thermal-Dynamic model in Comsol was created to solve for the
thermal loading. Integrating this software with MatLab, various models, including an axial FP-OHP, spray/forced convection, cooling channel, and control model were tested for a repeatedly fired gun system. Finally, a 2D structural optimization within Comsol and MatLab was created to evaluate the feasibility and optimization of an axial FP-OHP design.
Advisors/Committee Members: Smith, Douglas E. (advisor).
Subjects/Keywords: electromagnetic launchers; thermal management
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APA (6th Edition):
Tessler, B. (2012). Modeling and evaluation of EML rail cooling methods through finite element analysis. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/36777
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tessler, Bradley. “Modeling and evaluation of EML rail cooling methods through finite element analysis.” 2012. Thesis, University of Missouri – Columbia. Accessed January 22, 2021.
http://hdl.handle.net/10355/36777.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tessler, Bradley. “Modeling and evaluation of EML rail cooling methods through finite element analysis.” 2012. Web. 22 Jan 2021.
Vancouver:
Tessler B. Modeling and evaluation of EML rail cooling methods through finite element analysis. [Internet] [Thesis]. University of Missouri – Columbia; 2012. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10355/36777.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tessler B. Modeling and evaluation of EML rail cooling methods through finite element analysis. [Thesis]. University of Missouri – Columbia; 2012. Available from: http://hdl.handle.net/10355/36777
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Loughborough University
11.
Jones, Andy.
Component-led integrative optimisation methodology for avionic thermal management.
Degree: PhD, 2017, Loughborough University
URL: http://hdl.handle.net/2134/24785
► The modern military aircraft can be defined as a System of Systems (SoS); several distinct systems operating simultaneously across boundary interfaces. As the on-board subsystems…
(more)
▼ The modern military aircraft can be defined as a System of Systems (SoS); several distinct systems operating simultaneously across boundary interfaces. As the on-board subsystems have become more complex and diverse, the development process has become more isolated. When considering thermal management of distributed heat loads, the aircraft has become a collection of individually optimised components and subsystems, rather than the implementation of a single system to perform a given task. Avionic thermal management is quickly becoming a limiting factor of aircraft performance, reliability and effectiveness. The challenge of avionic thermal management is growing with the increasing complexity and power density of avionic packages. The aircraft relies on a heat rejection growth capacity to accommodate the additional through-life avionic heat loads. Growth capacity is defined as an allowable thermal loading growth designed into the system by the underutilisation of spatial and cooling supply at aircraft introduction; however, this is a limited resource and aircraft subsystem cooling capability is reaching a critical point. The depleted growth capacity coupled with increased avionic power demands has led to component thermal failure. However, due to the poor resolution of existing data acquisition, experimental facilities or thermodynamic modeling, the exact inflight-operating conditions remain relatively unknown. The knowledge gap identified in this work is the lack of definitive methodology to generate high fidelity data of in-flight thermal conditions of fast-jet subsystems and provide evidence towards effective future thermal management technologies. It is shown that, through the development of a new methodology, the knowledge gap can be reduced and as an output of this approach the unknown system behaviour can be defined. A multidisciplinary approach to the replication, analysis and optimisation of a fast-jet TMS is detailed. The development of a new Ground Test Facility (GTF) allows previously unidentified system thermal behaviour to be evaluated at component, subsystem and system level. The development of new data to characterise current thermal performance of a fast jet TMS allows recommendations of several new technologies to be implemented through a component led integrative system optimisation. This approach is to consider the TMS as a single system to achieve a single goal of component thermal management. Three technologies are implemented to optimise avionic conditions through the minimisation of bleed air consumption, improve avionic reliability through increased avionic component isothermalisation and increase growth capacity through improved avionic heat exchanger fin utilisation. These component level technologies improved system level performance. A reduction in TMS bleed air consumption from 1225kg to 510kg was found to complete a typical flight profile. A peak predicted aircraft specific fuel consumption saving of 1.23% is seen at a cruise flight condition because of this approach to avionic thermal…
Subjects/Keywords: 629.135; Avionic thermal management; Fast-jet military aircraft; Environmental control System; Thermal modelling; Ground test facilities; Thermal management systems; Thermal technologies
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APA ·
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MLA ·
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CSE |
Export
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APA (6th Edition):
Jones, A. (2017). Component-led integrative optimisation methodology for avionic thermal management. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/24785
Chicago Manual of Style (16th Edition):
Jones, Andy. “Component-led integrative optimisation methodology for avionic thermal management.” 2017. Doctoral Dissertation, Loughborough University. Accessed January 22, 2021.
http://hdl.handle.net/2134/24785.
MLA Handbook (7th Edition):
Jones, Andy. “Component-led integrative optimisation methodology for avionic thermal management.” 2017. Web. 22 Jan 2021.
Vancouver:
Jones A. Component-led integrative optimisation methodology for avionic thermal management. [Internet] [Doctoral dissertation]. Loughborough University; 2017. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/2134/24785.
Council of Science Editors:
Jones A. Component-led integrative optimisation methodology for avionic thermal management. [Doctoral Dissertation]. Loughborough University; 2017. Available from: http://hdl.handle.net/2134/24785
Carnegie Mellon University
12.
Wei, William Lien Chin.
New Studies on Thermal Transport in Metal Additive Manufacturing Processes and Products.
Degree: 2017, Carnegie Mellon University
URL: http://repository.cmu.edu/dissertations/1057
► Additive manufacturing (AM) is a manufacturing technique that adds material, such as polymers, ceramics, and metals, in patterned layers to build three-dimensional parts for applications…
(more)
▼ Additive manufacturing (AM) is a manufacturing technique that adds material, such as polymers, ceramics, and metals, in patterned layers to build three-dimensional parts for applications related to medicine, aviation, and energy. AM processes for metals like selective laser melting (SLM) hold the unique advantage of fabricating metal parts with complex architectures that cannot be produced by conventional manufacturing techniques. Thermal transport can be a focal point of unique AM products and is likewise important to metal AM processes. This dissertation investigates AM metal meshes with spatially varied thermal conductivities that can be used to maximize the charge and discharge rates for thermal energy storage and thermal management by phase change materials (PCMs). Further, manufacturing these meshes demands excellent thermal control in the metal powder bed for SLM processes. Since the thermal conductivities of metal powders specific to AM were previously unknown, we made pioneering measurements of such powders as a function of gas infiltration. In the past, thermal transport was improved in phase change materials for energy storage by adding spatially homogeneous metal foams or particles into PCMs to create composites with uniformly-enhanced (UE) thermal conductivity. Spatial variation can now be realized due to the emergence of metal AM processes whereby graded AM meshes are inserted into PCMs to create PCM composites with spatially-enhanced (SE) thermal conductivity. As yet, there have been no studies on what kind of spatial variation in thermal conductivity can further improve charge and discharge rates of the PCM. Making such mesh structures, which exhibit unsupported overhangs that limit heat dissipation pathways during SLM processes, demands understanding of heat diffusion within the surrounding powder bed. This inevitably relies on the precise knowledge of the thermal conductivity of AM metal powders. Currently, no measurements of thermal conductivity of AM powders have been made for the SLM process. In chapter 2 and 3, we pioneer and optimize the spatial variation of metal meshes to maximize charge and discharge rates in PCMs. Chapter 2 defines and analytically determines an enhancement ratio of charge rates using spatially-linear thermal conductivities in Cartesian and cylindrical coordinates with a focus on thermal energy storage. Chapter 3 further generalizes thermal conductivity as a polynomial function in space and numerically optimizes the enhancement ratio in spherical coordinates with a focus on thermal management of electronics. Both of our studies find that higher thermal conductivities of SE composites near to the heat source outperform those of UE composites. For selected spherical systems, the enhancement ratio reaches more than 800% relative to existing uniform foams. In chapter 4, the thermal conductivities of five metal powders for the SLM process were measured using the transient hot wire method. These measurements were conducted with three infiltrating gases (He, N2, and Ar) within a…
Subjects/Keywords: Additive Manufacturing; Phase Change Materials; Spatial Enhancement; Thermal Conductivity; Thermal Management; Thermal Transport
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APA (6th Edition):
Wei, W. L. C. (2017). New Studies on Thermal Transport in Metal Additive Manufacturing Processes and Products. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/1057
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wei, William Lien Chin. “New Studies on Thermal Transport in Metal Additive Manufacturing Processes and Products.” 2017. Thesis, Carnegie Mellon University. Accessed January 22, 2021.
http://repository.cmu.edu/dissertations/1057.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wei, William Lien Chin. “New Studies on Thermal Transport in Metal Additive Manufacturing Processes and Products.” 2017. Web. 22 Jan 2021.
Vancouver:
Wei WLC. New Studies on Thermal Transport in Metal Additive Manufacturing Processes and Products. [Internet] [Thesis]. Carnegie Mellon University; 2017. [cited 2021 Jan 22].
Available from: http://repository.cmu.edu/dissertations/1057.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wei WLC. New Studies on Thermal Transport in Metal Additive Manufacturing Processes and Products. [Thesis]. Carnegie Mellon University; 2017. Available from: http://repository.cmu.edu/dissertations/1057
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manchester
13.
Liu, Shuran.
Reliability Evaluation of Electric Power Systems
Integrating Cable Design and Ageing.
Degree: 2019, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318158
► The restructuring of the electricity sector forces utilities to operate their existing power networks with increasing flexibility and efficiency. Alternative cable rating methods, such as…
(more)
▼ The restructuring of the electricity sector forces
utilities to operate their existing power networks with increasing
flexibility and efficiency. Alternative cable rating methods, such
as emergency and dynamic ratings, improve the utilisation of
existing network cables, and provide cable-based networks with
additional flexibility and resilience against uncertainties.
However, such approaches may pose more stress on network cables and
increase the risk of
thermal overloading and ageing. This thesis
advances the existing power system reliability assessment
methodology by integrating a detailed cable system
thermal-ageing
model that considers cable design properties and environmental
conditions into a traditional sequential Monte Carlo simulation.
The main outcome of this integration was the comprehensive
probabilistic evaluation of cable networks’ reliability, together
with each individual cable’s
thermal performance and ageing risk.
The methodological framework integrating cable design and ageing
provides operators with the additional tools to identify key
network cables based on a quantified ageing index in order to
perform optimised cable replacement and maintenance strategies. The
framework has also helped utilities and operators to propose
alternative cable operating practices to increase the loadability
and flexibility of cable-based networks for better network
performance, but also to avoid excessive risk of cable ageing. The
methodological framework was applied on four test networks for four
specific case studies. The first study presented an innovative
methodology to capture the additional risk of cable failure and
ageing when cables are operated beyond their limits. The second
study further quantified the network reliability benefits and cable
ageing risks when extended durations and increased ampacity of the
emergency ratings are implemented. These two studies will inform
the utilities of the benefits and risks of implementing emergency
rating of UGCs and to help them to make decisions related to
optimising their operational flexibility. The third study proposed
an alternative flexible cable current rating method to optimise the
loading capability of existing cable tie lines between wind farms
and host utilities. It allows the wind farm developers to increase
their generation capacities without upgrading their existing cable
tie circuits and risking the cable lifetime. The last study
evaluated the benefits and potential risks of emergency ratings of
UGCs could give in a distribution cable network with EV
connections. The proposed emergency rating approach enables for a
higher penetration level of EVs while an acceptable level of cable
ageing is generated.
Advisors/Committee Members: DUROVIC, SINISA S, Kopsidas, Konstantinos, Durovic, Sinisa.
Subjects/Keywords: Power System Reliability; Power Cables; Asset Management; Thermal Ageing; Thermal Modelling; Thermal Rating; Reliability Assessment
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Manager
APA (6th Edition):
Liu, S. (2019). Reliability Evaluation of Electric Power Systems
Integrating Cable Design and Ageing. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318158
Chicago Manual of Style (16th Edition):
Liu, Shuran. “Reliability Evaluation of Electric Power Systems
Integrating Cable Design and Ageing.” 2019. Doctoral Dissertation, University of Manchester. Accessed January 22, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318158.
MLA Handbook (7th Edition):
Liu, Shuran. “Reliability Evaluation of Electric Power Systems
Integrating Cable Design and Ageing.” 2019. Web. 22 Jan 2021.
Vancouver:
Liu S. Reliability Evaluation of Electric Power Systems
Integrating Cable Design and Ageing. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Jan 22].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318158.
Council of Science Editors:
Liu S. Reliability Evaluation of Electric Power Systems
Integrating Cable Design and Ageing. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318158
Rochester Institute of Technology
14.
Merkel, Cory.
Thermal profiling in CMOS/memristor hybrid architectures.
Degree: Computer Engineering, 2011, Rochester Institute of Technology
URL: https://scholarworks.rit.edu/theses/3171
► CMOS/memristor hybrid architectures combine conventional CMOS processing elements with thin-film memristor-based crossbar circuits for high-density reconfigurable systems. These architectures have received an explosive growth in…
(more)
▼ CMOS/memristor hybrid architectures combine conventional CMOS processing elements with thin-film memristor-based crossbar circuits for high-density reconfigurable systems. These architectures have received an explosive growth in research over the past few years due to the first practical demonstration of a thin-film memristor in 2008. The reliability and lifetimes of both the CMOS and memristor partitions of these architectures are severely affected by temperature variations across the chip. Therefore, it is expected that dynamic
thermal management (DTM) mechanisms will be needed to improve their reliability and lifetime.
This thesis explores one aspect of DTM –
thermal profiling – in a CMOS/memristor memory architecture. A temperature sensing resistive random access memory (TSRRAM) was designed. Temperature information is extracted from the TSRRAM by measuring the write time of thin-film memristors. Active and passive sensing mechanisms are also introduced as means for DTM algorithms to determine the
thermal profile of the chip. Crosstherm, a simulation framework, was developed to analyze the effects of temperature variations in CMOS/memristor architectures.
The TSRRAM design was simulated using the Crosstherm framework for four CMOS processor benchmarks. Passive sensing produced a mean absolute sensor error across all benchmarks of 2.14 K. The size of the DTM unit's memory was also shown to have a significant impact on the accuracy of extracted
thermal data during passive sensing. Active sensing was also demonstrated to show the effect of dynamic adjustment of sensor resolution on the accuracy of hotspot temperature estimations.
Advisors/Committee Members: Kudithipudi, Dhireesha.
Subjects/Keywords: Crossbar; Dynamic thermal management; Hybrid architecture; Memristor; RRAM; Thermal profiling
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APA (6th Edition):
Merkel, C. (2011). Thermal profiling in CMOS/memristor hybrid architectures. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/3171
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Merkel, Cory. “Thermal profiling in CMOS/memristor hybrid architectures.” 2011. Thesis, Rochester Institute of Technology. Accessed January 22, 2021.
https://scholarworks.rit.edu/theses/3171.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Merkel, Cory. “Thermal profiling in CMOS/memristor hybrid architectures.” 2011. Web. 22 Jan 2021.
Vancouver:
Merkel C. Thermal profiling in CMOS/memristor hybrid architectures. [Internet] [Thesis]. Rochester Institute of Technology; 2011. [cited 2021 Jan 22].
Available from: https://scholarworks.rit.edu/theses/3171.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Merkel C. Thermal profiling in CMOS/memristor hybrid architectures. [Thesis]. Rochester Institute of Technology; 2011. Available from: https://scholarworks.rit.edu/theses/3171
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
15.
Lopez, Carlos F.
Modeling and Experimental Study of Lithium-Ion Battery Thermal Behavior.
Degree: MS, Mechanical Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155281
► While the popularity of lithium-ion batteries (LIBs) has increased significantly in recent years, safety concerns due to the high thermal instability of LIBs limit their…
(more)
▼ While the popularity of lithium-ion batteries (LIBs) has increased significantly in recent years, safety concerns due to the high
thermal instability of LIBs limit their use in applications with zero tolerance for failure. A safety issue of particular interest is a scenario called
thermal runaway in which several exothermic side-reactions occur at elevated temperature ranges and release heat, which can then trigger the next reaction. This matter worsens when multiple cells are installed in close proximity to each other as the released heat from an abused cell can activate the chain of reactions in a neighboring cell, causing an entire module to heat rapidly and vent or ignite. This body of work aims to study LIB
thermal behavior using both modeling and experiments to determine design practices that improve the safety of LIB modules. Based on the results of single cell abuse testing, a numerical model of the side-reactions that occur during
thermal runaway was developed. The results showed that cell form factor and ambient conditions influence abuse behavior significantly. These abuse tests were extended to multi-cell modules to determine the effect of cell spacing, electrical configuration, and protection materials on the propagation of
thermal runaway from an abused cell to a surrounding one. Lastly, an electrochemically coupled
thermal model of battery
thermal management systems of various configurations was created. An optimum
thermal management design was found that utilized both active and passive methods of cooling to keep cell temperatures and
thermal gradients within safe limits. The work described herein is expected to provide insight into safe battery design practices.
Advisors/Committee Members: Mukherjee, Partha P (advisor), Jeevarajan, Judith (committee member), Banerjee, Debjyoti (committee member), Bhattacharya, Raktim (committee member).
Subjects/Keywords: Lithium-ion batteries; thermal runaway; thermal management; safety
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APA (6th Edition):
Lopez, C. F. (2015). Modeling and Experimental Study of Lithium-Ion Battery Thermal Behavior. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155281
Chicago Manual of Style (16th Edition):
Lopez, Carlos F. “Modeling and Experimental Study of Lithium-Ion Battery Thermal Behavior.” 2015. Masters Thesis, Texas A&M University. Accessed January 22, 2021.
http://hdl.handle.net/1969.1/155281.
MLA Handbook (7th Edition):
Lopez, Carlos F. “Modeling and Experimental Study of Lithium-Ion Battery Thermal Behavior.” 2015. Web. 22 Jan 2021.
Vancouver:
Lopez CF. Modeling and Experimental Study of Lithium-Ion Battery Thermal Behavior. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1969.1/155281.
Council of Science Editors:
Lopez CF. Modeling and Experimental Study of Lithium-Ion Battery Thermal Behavior. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155281
University of Ontario Institute of Technology
16.
Ramotar, Lokendra.
Full vehicle simulation and exploration of a range extended electric vehicle battery pack and thermal management system in diurnal operating environments.
Degree: 2018, University of Ontario Institute of Technology
URL: http://hdl.handle.net/10155/1008
► A full vehicle model is created in Autonomie to represent a production extended range electric vehicle (EREV), specifically including the high voltage battery pack which…
(more)
▼ A full vehicle model is created in Autonomie to represent a production extended range electric vehicle (EREV), specifically including the high voltage battery pack which is validated in dynamic operation against experimental data. Vehicle data is utilized as comparative input to a
thermal equivalent circuit model developed analytically which aims to capture and understand the heat propagation from the cells through the entire pack, to and from the environment. The inclusion of production hardware and the liquid battery
thermal management system components into the physical model considers detail geometric properties to calculate
thermal resistances of components (conduction, convection and radiation) along with their associated
thermal capacitances. Analog equivalent circuit simulations using PSPICE are compared to experimental results in order to validate internal temperature nodes and the heat rate through various elements with heat flux sensors; all used to refine the model. The solar data, diurnal temperature and terrain are included in the simulations to model the effects of gradient, convection and road radiation on the battery pack; both stationary and through drive cycles.
The
thermal equivalent circuit accurately quantifies the heat flow dynamics of the battery. Convection and radiation sources primarily influenced the baseplate and underbody shield components whereas cell heat propagation was closely linked to cell retention frame hardware details. The distribution of cooling indicated close to 90% was directed to the cell while the remaining 10% went to the surrounding hardware. Modeling a quiescent background cooling showed the ability to reduce the diurnal temperature effects on the battery pack at the 50 watt level. The addition of insulation in key areas delineated the ability to reduce initial cell temperatures for all drive cycles, while a miniscule amount added between the cell and retention frame interface showed increased cooling capacity directed towards the cells nearing 100%. The models developed incorporated many elements which were neglected or highly simplified in all previous works and the methodology developed highlights an ability to generate accurate dynamic results with little computational power. This is a prerequisite to enable predictive controls and accurate onboard system diagnostics to extend the pack???s operational life.
Advisors/Committee Members: Rohrauer, Greg.
Subjects/Keywords: Battery thermal management; EV; HEV; Thermal network; Vehicle simulations
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APA (6th Edition):
Ramotar, L. (2018). Full vehicle simulation and exploration of a range extended electric vehicle battery pack and thermal management system in diurnal operating environments. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/1008
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ramotar, Lokendra. “Full vehicle simulation and exploration of a range extended electric vehicle battery pack and thermal management system in diurnal operating environments.” 2018. Thesis, University of Ontario Institute of Technology. Accessed January 22, 2021.
http://hdl.handle.net/10155/1008.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ramotar, Lokendra. “Full vehicle simulation and exploration of a range extended electric vehicle battery pack and thermal management system in diurnal operating environments.” 2018. Web. 22 Jan 2021.
Vancouver:
Ramotar L. Full vehicle simulation and exploration of a range extended electric vehicle battery pack and thermal management system in diurnal operating environments. [Internet] [Thesis]. University of Ontario Institute of Technology; 2018. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10155/1008.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ramotar L. Full vehicle simulation and exploration of a range extended electric vehicle battery pack and thermal management system in diurnal operating environments. [Thesis]. University of Ontario Institute of Technology; 2018. Available from: http://hdl.handle.net/10155/1008
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toronto
17.
Feng, Chen.
Fabrication of Thermal Management Devices using Thermal Spray Technology.
Degree: PhD, 2019, University of Toronto
URL: http://hdl.handle.net/1807/97425
► Thermal spray coating processes have been employed to create a composite finned heat sink and a flat vapor chamber featuring structured porous coating wicks, for…
(more)
▼ Thermal spray coating processes have been employed to create a composite finned heat sink and a flat vapor chamber featuring structured porous coating wicks, for
thermal management application. Three composite heat sinks in the shape of a disk, a cylinder, and a cylinder with vertically projecting fins were made by applying a thin (0.4 – 0.7 mm) zinc layer onto ABS polymer cores using wire-arc spraying. An analytical model of the heat conduction in an annular fin was developed, and the model was found to agree well with the temperature distribution along the disk-shaped heat sink measured using an infra-red camera. The calculated temperatures at the base of the heat sink also agreed with measured values as heater power was varied. The model was used to examine the effect of fin radius and coating thickness on fin efficiency. A flat copper vapor chamber was fabricated by depositing structured porous coatings on the evaporator using flame spraying. The porous copper coatings act as wicks of the vapor chamber for liquid transport due to the capillary effect. Channels to enhance liquid flow were made in the porous copper coatings. Coated samples were made with porosity varying from 2 to 44 %, and groove width ranging from 0.16 to 0.53 mm. The capillary performance of the coatings was evaluated experimentally by measuring the rate-of-rise of ethanol in the coatings. The capillary performance parameter ∆Pcap∙k increases with coating porosity and channel size. The rate of ethanol evaporation on the vertically placed coated samples was investigated. Increasing the effective porosity of the coating enhanced the maximum mass flow rate through it. The flat vapor chamber charged with water operated successfully, and in the heat spreader test it achieved an overall
thermal resistance of 0.13 K/W at a maximum heating power of 162 W. The structured porous wicks demonstrated a greater capillary performance than sintered powder wicks, which extends the heat flux up to 140 W/cm2 without reaching the capillary limit. The effective radial conductivity ranges from 1200 to 7000 W/m∙K, depending on the applied power.
Advisors/Committee Members: Chandra, Sanjeev, Mechanical and Industrial Engineering.
Subjects/Keywords: Analytical modelling; Heat transfer; Thermal management devices; Thermal spraying; 0537
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APA (6th Edition):
Feng, C. (2019). Fabrication of Thermal Management Devices using Thermal Spray Technology. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/97425
Chicago Manual of Style (16th Edition):
Feng, Chen. “Fabrication of Thermal Management Devices using Thermal Spray Technology.” 2019. Doctoral Dissertation, University of Toronto. Accessed January 22, 2021.
http://hdl.handle.net/1807/97425.
MLA Handbook (7th Edition):
Feng, Chen. “Fabrication of Thermal Management Devices using Thermal Spray Technology.” 2019. Web. 22 Jan 2021.
Vancouver:
Feng C. Fabrication of Thermal Management Devices using Thermal Spray Technology. [Internet] [Doctoral dissertation]. University of Toronto; 2019. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1807/97425.
Council of Science Editors:
Feng C. Fabrication of Thermal Management Devices using Thermal Spray Technology. [Doctoral Dissertation]. University of Toronto; 2019. Available from: http://hdl.handle.net/1807/97425
University of Windsor
18.
De Medio, Federico.
Impact on new aerodynamic solutions for the front-end on the engine bay thermal performance.
Degree: MA, Mechanical, Automotive, and Materials Engineering, 2014, University of Windsor
URL: https://scholar.uwindsor.ca/etd/5220
► This work investigates the impact of an innovative aerodynamic solution for the front-end of a vehicle on the engine bay thermal performance. Starting from…
(more)
▼ This work investigates the impact of an innovative aerodynamic solution for the front-end of a vehicle on the engine bay
thermal performance. Starting from a production series automobile, an alternative aerodynamic configuration was studied, with the aim of improving the overall aerodynamic behavior without excessively penalizing the
thermal aspect, and by keeping into account all the involved constraints. The aero-
thermal performances were evaluated through a co-simulation approach which exploits a CFD and a
thermal computational solver. The main driver for this research was the increasing demand for fuel efficient vehicles. Nowadays, in order to comply with more and more severe regulations, the car manufacturers are trying to study solutions able to guarantee the achievement of emissions and fuel consumption targets mandated by law. This thesis focuses on one possible way to achieve such targets in the short term on a model already in production.
Advisors/Committee Members: Carriveau, Rupp.
Subjects/Keywords: Aerodynamics; Aero-thermal; Automotive; CFD; Simulation; Thermal management
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APA (6th Edition):
De Medio, F. (2014). Impact on new aerodynamic solutions for the front-end on the engine bay thermal performance. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5220
Chicago Manual of Style (16th Edition):
De Medio, Federico. “Impact on new aerodynamic solutions for the front-end on the engine bay thermal performance.” 2014. Masters Thesis, University of Windsor. Accessed January 22, 2021.
https://scholar.uwindsor.ca/etd/5220.
MLA Handbook (7th Edition):
De Medio, Federico. “Impact on new aerodynamic solutions for the front-end on the engine bay thermal performance.” 2014. Web. 22 Jan 2021.
Vancouver:
De Medio F. Impact on new aerodynamic solutions for the front-end on the engine bay thermal performance. [Internet] [Masters thesis]. University of Windsor; 2014. [cited 2021 Jan 22].
Available from: https://scholar.uwindsor.ca/etd/5220.
Council of Science Editors:
De Medio F. Impact on new aerodynamic solutions for the front-end on the engine bay thermal performance. [Masters Thesis]. University of Windsor; 2014. Available from: https://scholar.uwindsor.ca/etd/5220
Universidad de Navarra
19.
[No author].
A model Based Desing of a Thermal Management System for a High Power Lithium-Ion Battery Pack.
Degree: 2014, Universidad de Navarra
URL: http://hdl.handle.net/10171/37125
► In the present thesis an improved design methodology is proposed for TMSs (Thermal Management Systems) for high power lithium-ion battery packs used in traction applications.…
(more)
▼ In the present thesis an improved design methodology is proposed for TMSs
(
Thermal Management Systems) for high power lithium-ion battery packs used
in traction applications. The methodology involves the development of
different mathematical models for heat generation, transmission, and
dissipation and their coupling and integration in the battery pack design
methodology in order to improve overall safety and performance. The
sequence of steps to be followed according to the proposed methodology are
described throughout the chapters of this thesis.
Thermal issues associated with battery packs are identified and solved.
In order to do this, first an in-depth characterization of three different lithiumion
cells is performed in order to better understand their
thermal behavior.
The characterization tests include battery electric and calorimetric
experiments, which provide the information required for the development of a
heat generation model.
Battery models that integrate the heat generation model are then
developed using the finite volume method, and they provide the basis for the
thermal management system´s design. Various model approaches that shorten
simulation times in order to perform simulations in a wide range of operating
conditions within a reasonable computational time are analyzed. Results from
the simulations are used to obtain information, evaluate designs, and provide
solutions for battery
thermal issues, such as the proper temperature control of
the cells that made up the battery pack.
The validity of the different assumptions made for the development of
the
thermal CFD (Computational Fluid Dynamics) models is proved by means of
heat transfer and fluid flow experiments on a battery module prototype. Once
validated, the CFD models are used to check the suitability of the proposed
thermal management system design for a real traction application, which
proves the effectiveness of a
thermal management system design process
based on numerical modeling.
Although in the present work the steps of the method used to
systematically design and evaluate TMSs for battery systems are applied to a
particular case of liquid cooling, the steps are also likely to be of use to battery
designers who have to deal with different types of cooling arrangements and
applications.
Advisors/Committee Members: Blanco Barro, F.J. (Francisco Javier) (advisor), Ramos-González, J. (Juan Carlos) (advisor).
Subjects/Keywords: Thermal modeling.;
Thermal management system.;
Lithium-ion battery pack.;
Transpor application.
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APA (6th Edition):
author], [. (2014). A model Based Desing of a Thermal Management System for a High Power Lithium-Ion Battery Pack.
(Thesis). Universidad de Navarra. Retrieved from http://hdl.handle.net/10171/37125
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
author], [No. “A model Based Desing of a Thermal Management System for a High Power Lithium-Ion Battery Pack.
” 2014. Thesis, Universidad de Navarra. Accessed January 22, 2021.
http://hdl.handle.net/10171/37125.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
author], [No. “A model Based Desing of a Thermal Management System for a High Power Lithium-Ion Battery Pack.
” 2014. Web. 22 Jan 2021.
Vancouver:
author] [. A model Based Desing of a Thermal Management System for a High Power Lithium-Ion Battery Pack.
[Internet] [Thesis]. Universidad de Navarra; 2014. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10171/37125.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
author] [. A model Based Desing of a Thermal Management System for a High Power Lithium-Ion Battery Pack.
[Thesis]. Universidad de Navarra; 2014. Available from: http://hdl.handle.net/10171/37125
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
20.
Huang, Haoxiang.
Investigation of phonon transport and thermal boundary conductance at the interface of functionalized SWCNT and poly (ether-ketone).
Degree: MS, Mechanical Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/58623
► The thermal and electrical applications of many polymers commonly used in commercial and defense applications are scarce due to their low conductivities. The fillers of…
(more)
▼ The
thermal and electrical applications of many polymers commonly used in commercial and defense applications are scarce due to their low conductivities. The fillers of carbon nano-structures such as single-walled carbon nanotubes (SWCNTs) in the polymer matrix can lead to significant improvement in the
thermal and electrical properties of the resulting nano-composite. An exceptional improvement in the electrical and
thermal conductivity of fibers made by poly (ether) ketone (PEK) grafted few walled carbon nanotube has been observed in the experiments. However, the
thermal interaction of SWCNT and PEK molecules has not been understood yet. In this study, the SWCNT is covalently bonded to PEK molecules using crosslinking methodology and the interfacial
thermal boundary conductance between SWCNT and PEK are estimated using molecular dynamics methods, non-equilibrium/direct method. The phonon transport at the interface of SWCNT and PEK is investigated by computing the spectral energy density and the decay of spectral temperature in different frequency bands of SWCNT for different number of covalent bonds between SWCNT and PEK. The analysis elucidate that covalent bond between the SWCNT and PEK significantly enhances the
thermal coupling at the interface compared to non-bonded SWCNT, but the
thermal transport saturates after a certain number of covalent bonds between SWCNT and PEK.
Advisors/Committee Members: Kumar, Satish (advisor), Zhang, Zhuomin (committee member), Kumar, Satish (committee member).
Subjects/Keywords: Thermal science; Nano-heat transfer; Thermal management; Nano-composite
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APA (6th Edition):
Huang, H. (2016). Investigation of phonon transport and thermal boundary conductance at the interface of functionalized SWCNT and poly (ether-ketone). (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/58623
Chicago Manual of Style (16th Edition):
Huang, Haoxiang. “Investigation of phonon transport and thermal boundary conductance at the interface of functionalized SWCNT and poly (ether-ketone).” 2016. Masters Thesis, Georgia Tech. Accessed January 22, 2021.
http://hdl.handle.net/1853/58623.
MLA Handbook (7th Edition):
Huang, Haoxiang. “Investigation of phonon transport and thermal boundary conductance at the interface of functionalized SWCNT and poly (ether-ketone).” 2016. Web. 22 Jan 2021.
Vancouver:
Huang H. Investigation of phonon transport and thermal boundary conductance at the interface of functionalized SWCNT and poly (ether-ketone). [Internet] [Masters thesis]. Georgia Tech; 2016. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1853/58623.
Council of Science Editors:
Huang H. Investigation of phonon transport and thermal boundary conductance at the interface of functionalized SWCNT and poly (ether-ketone). [Masters Thesis]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/58623
De Montfort University
21.
Glover, James.
The design and thermal measurement of III-V integrated micro-coolers for thermal management of microwave devices.
Degree: PhD, 2016, De Montfort University
URL: http://hdl.handle.net/2086/13299
► Modern high frequency electronic devices are continually becoming smaller in area but capable of generating higher RF power, thereby increasing the dissipated power density. For…
(more)
▼ Modern high frequency electronic devices are continually becoming smaller in area but capable of generating higher RF power, thereby increasing the dissipated power density. For many microwave devices, for example the planar Gunn diode, standard thermal management may no longer be sufficient to effectively remove the increasing dissipated power. The work has looked at the design and development of an active micro-cooler, which could be fully integrated with the planar Gunn diode at wafer level as a monolithic microwave integrated circuit (MMIC). The work also resulted in the further development of novel thermal measurement techniques, using micro-particle sensors with infra-red (IR) thermal microscopy and for the first time to measure thermal profiles along the channel of the planar Gunn diode. To integrate the gallium arsenide (GaAs) based planar Gunn diode and micro-cooler, it was first necessary to design and fabricate individual GaAs based planar Gunn diodes and micro-coolers for thermal and electrical characterisation. To obtain very small area micro-coolers, superlattice structures were investigated to improve the ratio between the electrical and thermal conductivities of the micro-cooler. To measure the specific contact resistivity of the superlattice based micro-cooler contacts, the Reeves & Harrison TLM (transmission line method) was used as it included both horizontal and vertical components of the contact resistance. It was found, for the GaAs based micro-cooler, only small amounts of cooling (< 0.4 °C) could be obtained, therefore the novel temperature measurement method using micro-particle sensors placed on both the anode and cathode contacts was utilised. The bias probes used to supply DC power to the micro-coolers were found to thermally load these very small structures, which led to anomalously high measured cooling temperatures of > 1°C. A novel approach of determining if the measured cooling temperature was due to cooling or probe loading was developed. A 1D model for the integrated micro-cooler was developed and the results indicated that when the micro-cooler was used as a cooling element in a monolithic microwave integrated circuit, the supporting substrate thickness was very important. Simulation showed to obtain cooling the substrate thickness had to be very thin (< 50 μm), which may preclude the use of GaAs micro-coolers as part of a monolithic microwave integrated circuit.
Subjects/Keywords: 621.5; thermal measurement; thermal management; planar Gunn diode; thermoelectric; micro-cooler
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APA (6th Edition):
Glover, J. (2016). The design and thermal measurement of III-V integrated micro-coolers for thermal management of microwave devices. (Doctoral Dissertation). De Montfort University. Retrieved from http://hdl.handle.net/2086/13299
Chicago Manual of Style (16th Edition):
Glover, James. “The design and thermal measurement of III-V integrated micro-coolers for thermal management of microwave devices.” 2016. Doctoral Dissertation, De Montfort University. Accessed January 22, 2021.
http://hdl.handle.net/2086/13299.
MLA Handbook (7th Edition):
Glover, James. “The design and thermal measurement of III-V integrated micro-coolers for thermal management of microwave devices.” 2016. Web. 22 Jan 2021.
Vancouver:
Glover J. The design and thermal measurement of III-V integrated micro-coolers for thermal management of microwave devices. [Internet] [Doctoral dissertation]. De Montfort University; 2016. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/2086/13299.
Council of Science Editors:
Glover J. The design and thermal measurement of III-V integrated micro-coolers for thermal management of microwave devices. [Doctoral Dissertation]. De Montfort University; 2016. Available from: http://hdl.handle.net/2086/13299
University of Maryland
22.
Fish, Michael Christopher.
Thermal Isolation of High Power Devices in Heterogeneous Integration.
Degree: Mechanical Engineering, 2017, University of Maryland
URL: http://hdl.handle.net/1903/20428
► Heterogeneous integration (HI) technologies present an important development in the pursuit of higher performance and reduced size, weight, power and cost of electronic systems (SWAP-C).…
(more)
▼ Heterogeneous integration (HI) technologies present an important development in the pursuit of higher performance and reduced size, weight, power and cost of electronic systems (SWAP-C). HI systems, however, pose additional challenges for
thermal management due to the disparate operating conditions of the devices. If the
thermal coupling between devices can be reduced through a strategy of
thermal isolation, then the SWAP-C of the accompanying
thermal solution can also be reduced. This is in contrast to the alternative scenario of cooling the entire package to the maximum reliable temperature of the most sensitive devices. This isolation strategy must be implemented without a significant increase in device interconnect distances.
A counter-intuitive approach is to seek packaging materials of low
thermal conductivity – e.g. glass – and enhance them with arrays of metallic through-layer vias. This dissertation describes the first ever demonstration of integrating such via-enhanced interposers with microfluidic cooling, a
thermal solution key to the high power applications for which HI was developed. Among the interposers tested, the best performing were shown to exhibit lower
thermal coupling than bulk silicon in selective regions, validating their ability to provide
thermal isolation.
In the course of the study, the via-enhanced interposer is modeled as a
thermal metamaterial with desirable, highly-anisotropic properties. Missing from the supporting
literature is an accurate treatment of these interposers under such novel environments as microfluidic cooling. This dissertation identifies a new phenomenon,
thermal microspreading, which governs how heat couples into a conductive via array from its surroundings. Both finite element analysis (FEA) and a new analytic solution of the associated boundary value problem (BVP) are used to develop a model for describing microspreading. This improves the ability to correctly predict the
thermal behavior of via-enhanced interposers under diverse conditions.
Advisors/Committee Members: McCluskey, Patrick (advisor), Bar-Cohen, Avram (advisor).
Subjects/Keywords: Mechanical engineering; Heterogeneous Integration; Microfluidic; Microspreading; Thermal Isolation; Thermal Management
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Manager
APA (6th Edition):
Fish, M. C. (2017). Thermal Isolation of High Power Devices in Heterogeneous Integration. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/20428
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fish, Michael Christopher. “Thermal Isolation of High Power Devices in Heterogeneous Integration.” 2017. Thesis, University of Maryland. Accessed January 22, 2021.
http://hdl.handle.net/1903/20428.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fish, Michael Christopher. “Thermal Isolation of High Power Devices in Heterogeneous Integration.” 2017. Web. 22 Jan 2021.
Vancouver:
Fish MC. Thermal Isolation of High Power Devices in Heterogeneous Integration. [Internet] [Thesis]. University of Maryland; 2017. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1903/20428.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fish MC. Thermal Isolation of High Power Devices in Heterogeneous Integration. [Thesis]. University of Maryland; 2017. Available from: http://hdl.handle.net/1903/20428
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
23.
Reed, William Cody.
Comparison of Heat Exchanger Designs for Aircraft Thermal Management Systems.
Degree: MS, Aerospace Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/75142
► Thermal management has become a major concern in the design of current and future more and all electric aircraft (M/AEA). With ever increasing numbers of…
(more)
▼ Thermal management has become a major concern in the design of current and future more and all electric aircraft (M/AEA). With ever increasing numbers of on-board heat sources, higher heat loads, limited and even decreasing numbers of heat sinks, integration of advanced intelligence, surveillance and reconnaissance (ISR) and directed energy weapons, requirements for survivability, the use of composite materials, etc., existing
thermal management systems and their components have been pushed to the limit. To address this issue, more efficient methods of
thermal management must be implemented to ensure that these new M/AEA aircraft do not overheat and prematurely abort their missions. Crucial to this effort is the need to consider advanced heat exchanger concepts, comparing their designs and performance with those of the conventional compact exchangers currently used on-board aircraft
thermal management systems. As a step in this direction, the work presented in this thesis identifies two promising advanced heat exchanger concepts, namely, microchannel and phase change heat exchangers. Detailed conceptual design and performance models for these as well as for a conventional plate-fin compact heat exchanger are developed and their design and performance optimized relative to the criterion of minimum dry weight. Results for these optimizations are presented, comparisons made, conclusions drawn, and recommendations made for future research. These results and comparisons show potential performance benefits for aircraft
thermal management incorporating microchannel and phase change heat exchangers.
Advisors/Committee Members: Raj, Pradeep (committeechair), von Spakovsky, Michael R. (committeechair), Choi, Seongim Sarah (committee member).
Subjects/Keywords: Thermal Management System; Optimization; Aerospace; Heat Exchangers; Thermal Storage
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APA (6th Edition):
Reed, W. C. (2015). Comparison of Heat Exchanger Designs for Aircraft Thermal Management Systems. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/75142
Chicago Manual of Style (16th Edition):
Reed, William Cody. “Comparison of Heat Exchanger Designs for Aircraft Thermal Management Systems.” 2015. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/75142.
MLA Handbook (7th Edition):
Reed, William Cody. “Comparison of Heat Exchanger Designs for Aircraft Thermal Management Systems.” 2015. Web. 22 Jan 2021.
Vancouver:
Reed WC. Comparison of Heat Exchanger Designs for Aircraft Thermal Management Systems. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/75142.
Council of Science Editors:
Reed WC. Comparison of Heat Exchanger Designs for Aircraft Thermal Management Systems. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/75142
Delft University of Technology
24.
de Mooij, Cas (author).
A Spectrally Resolved Model for a PV + PCM System.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:1ae70ca5-8a8e-4f5b-8838-a106de39c18c
► As the world is trying to rely less on fossil fuels for electrical energy. To do this, the alternatives should be as efficient and durable…
(more)
▼ As the world is trying to rely less on fossil fuels for electrical energy. To do this, the alternatives should be as efficient and durable as possible. The alternative that has been growing the fastest in recent years is solar energy. Apart from it’s growth in the market share, the efficiency of photovoltaic (PV) cells has also steadily grown. Recently, this trend has started to stagnate, since most avenues of efficiency improvement have been exhausted. However, the possibilities of
thermal management (i.e. cooling) of PV cells are relatively unexplored. An increase in cell temperature causes a decrease in efficiency, in other words, less sunlight is converted into electrical energy. Moreover, high operating temperatures cause damage in solar cells, reducing their lifetime by months (or even years). One promising technology that can keep cell temperatures low is the Phase Change Material (PCM) based heat sink. A PCM takes a lot of energy to melt and during phase change it remains at a stable temperature. PV + PCM systems have shown to be able to increase cell efficiency by up to 8%. In order to get a better grip on the workings and the potential of PCMs as a heat sink for PV cells, this work presents an implicit, transient, spectrally resolved, MATLABbased model that can simulate module temperature and phase change within the PCM. The model uses SMARTS in combination with irradiance data to create spectral irradiance data. Using this spectral data together with GenPro4 provides the amount of energy absorbed by each layer of the PV cell. The PV part of the model is validated for a summer week in the Netherlands, with a Mean Absolute Error (MAE) of 1.83 and a Mean Bias Error (MBE) of 0.56. For a winter week in January the MAE was 1.76 and the MBE 1.44. When simulating only a PV module (so no PV + PCM system), the model can simulate 45 hours of data per hour, with one minute time step. When validating the PV + PCM model for the same weeks, the MAE was 2.96 and the MBE 1.91 for the summer week and a MAE of 1.37 and MBE of 1.15 for the winter week. When simulating a PV + PCM system the simulation time drops to 18 hours of simulated data per hour, due to a larger mesh and the requirement of several iterations in the PCM model. With this model a wide range of PV + PCM systems (e.g. with different thicknesses and melting temperatures) can be simulated for any location, provided that there is access to the following weather data: temperature, wind speed and irradiance.
Advisors/Committee Members: Isabella, O. (mentor), Ziar, H. (graduation committee), Ortiz Lizcano, J.C. (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: PV-PCM; Thermal modelling; Thermal management; PV System; MATLAB; GenPro4; SMARTS
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APA (6th Edition):
de Mooij, C. (. (2020). A Spectrally Resolved Model for a PV + PCM System. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1ae70ca5-8a8e-4f5b-8838-a106de39c18c
Chicago Manual of Style (16th Edition):
de Mooij, Cas (author). “A Spectrally Resolved Model for a PV + PCM System.” 2020. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:1ae70ca5-8a8e-4f5b-8838-a106de39c18c.
MLA Handbook (7th Edition):
de Mooij, Cas (author). “A Spectrally Resolved Model for a PV + PCM System.” 2020. Web. 22 Jan 2021.
Vancouver:
de Mooij C(. A Spectrally Resolved Model for a PV + PCM System. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:1ae70ca5-8a8e-4f5b-8838-a106de39c18c.
Council of Science Editors:
de Mooij C(. A Spectrally Resolved Model for a PV + PCM System. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:1ae70ca5-8a8e-4f5b-8838-a106de39c18c
University of Alberta
25.
Banaei Khosroushahi, Reza.
PDE Backstepping Boundary Observer Design with Application
to Thermal Management of PCR Process in Lab-on-a-Chip
Devices.
Degree: PhD, Department of Electrical and Computer
Engineering, 2013, University of Alberta
URL: https://era.library.ualberta.ca/files/8g84mn646
► In the past two decades, the idea of Lab-on-a-Chip (LOC) devices has received a growing attention from researchers. A Lab-on-a-Chip device can be thought of…
(more)
▼ In the past two decades, the idea of Lab-on-a-Chip
(LOC) devices has received a growing attention from researchers. A
Lab-on-a-Chip device can be thought of as a miniaturized biological
microchip that integrates several functionalities such as sample
pre-treatment, sample transportation, mixing, reaction, separation
and detection. Among the important functionalities that have been
successfully integrated into a Lab-on-a-Chip device is the
Polymerase chain reaction (PCR) process which enables rapid and
inexpensive genetic analysis. PCR process relies on a thermal
cycling process of repeated heating and cooling to replicate the
DNA to a sufficient amount for detection and analysis. However, the
PCR process requires precise measurement and control of the
reaction temperature that is a challenging problem especially in
the miniaturized LOC environment. The challenges associated with
the thermal control problem of a PCR process in the LOC environment
fall into two categories: first, there is no direct measurement of
the temperature inside the reaction chamber and second, the heat
distribution equation governing the thermal dynamics inside the
microchip naturally leads the modeling and control of the microchip
into the distributed parameter systems framework. This thesis deals
with the estimation of the temperature inside the PCR-LOC
microchip. Our goal in this thesis has two folds: first to
contribute to the backstepping theory for the PDE systems both in
the observer design and controller design stages, and second to use
this theory for our application, PCR-LOC microchip. PDE
Backstepping boundary observer design and its successful
implementation involve several challenges, including: -Solving the
PDE equation for the kernel function of the integral transformation
in the PDE backstepping design and all of the numerical issues that
come along. -Simulation aspects of the coupled PDE system composed
of the PDE observer and the original PDE system. -Verification
aspects, i.e. how to ensure that calibration is correct and the PDE
observer actually presents the temperature inside the chamber. This
thesis presents a number of innovative approaches to exclusively
deal with each of the aforementioned challenges. The successful
implementation of the designed observer and a previously designed
controller is also presented.
Subjects/Keywords: PDE Backstepping; Thermal Management; Boundary Observer
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APA (6th Edition):
Banaei Khosroushahi, R. (2013). PDE Backstepping Boundary Observer Design with Application
to Thermal Management of PCR Process in Lab-on-a-Chip
Devices. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/8g84mn646
Chicago Manual of Style (16th Edition):
Banaei Khosroushahi, Reza. “PDE Backstepping Boundary Observer Design with Application
to Thermal Management of PCR Process in Lab-on-a-Chip
Devices.” 2013. Doctoral Dissertation, University of Alberta. Accessed January 22, 2021.
https://era.library.ualberta.ca/files/8g84mn646.
MLA Handbook (7th Edition):
Banaei Khosroushahi, Reza. “PDE Backstepping Boundary Observer Design with Application
to Thermal Management of PCR Process in Lab-on-a-Chip
Devices.” 2013. Web. 22 Jan 2021.
Vancouver:
Banaei Khosroushahi R. PDE Backstepping Boundary Observer Design with Application
to Thermal Management of PCR Process in Lab-on-a-Chip
Devices. [Internet] [Doctoral dissertation]. University of Alberta; 2013. [cited 2021 Jan 22].
Available from: https://era.library.ualberta.ca/files/8g84mn646.
Council of Science Editors:
Banaei Khosroushahi R. PDE Backstepping Boundary Observer Design with Application
to Thermal Management of PCR Process in Lab-on-a-Chip
Devices. [Doctoral Dissertation]. University of Alberta; 2013. Available from: https://era.library.ualberta.ca/files/8g84mn646
Georgia Tech
26.
Athavale, Jayati Deepak.
Artificial neural network based prediction and cooling energy optimization of data centers.
Degree: PhD, Mechanical Engineering, 2018, Georgia Tech
URL: http://hdl.handle.net/1853/62620
► Thermal management of data centers remains a challenge because of their ever-increasing power densities and decreasing server footprints. Current lack of dynamic control over global…
(more)
▼ Thermal management of data centers remains a challenge because of their ever-increasing power densities and decreasing server footprints. Current lack of dynamic control over global provisioning and local distribution of cooling resources often result in wasteful overcooling. These trends motivate this thesis research, which focuses on the development of a reliable and energy-efficient framework for allocating cooling resources to meet
thermal management requirements, while minimizing energy consumption and adverse environmental impacts. A key component of energy-efficient
thermal management is real-time accurate prediction of temperature distribution in data centers. This first section of this dissertation focuses on development and comparison of four Data Driven Modeling (DDM) methods, namely Artificial Neural Networks (ANN), Support Vector Regression (SVR), Gaussian Process Regression (GPR) and Proper Orthogonal Decomposition (POD). These DDM methods were trained on datasets generated from offline Computational Fluid Dynamics/Heat Transfer (CFD/HT) simulations for real-time prediction of temperature and airflow distributions in a data center. Using CFD simulation results to train DDMs transfers computational complexity from model execution (in CFD) to model setup and development. To generate the training data, a physics-based and experimentally validated room-level CFD/HT model was developed using the commercial software Future Facilities 6Sigma Room. Another key component of the overall framework is a model to estimate the cooling power consumed by a data center. This research developed a model based on thermodynamic analyses of data center cooling equipment, as described here. Finally, development and implementation of a Genetic Algorithm (GA) based optimization framework in a data center lab is presented. The optimization framework employs an ANN based model to predict rack inlet air temperatures and a thermodynamic model to optimize cooling energy consumption. Results from a test run of 7.5 hours in the Data Center Laboratory indicate that implementing this optimization framework for dynamic provisioning of cooling resources reduces cooling power consumption by 20% compared with baseline operation without this optimization.
Advisors/Committee Members: Joshi, Yogendra (advisor), Yoda, Minami (advisor), Kumar, Satish (committee member), Augenbroe, Godfried (committee member), Gavrilovska, Ada (committee member).
Subjects/Keywords: Data center thermal management; Energy optimization
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APA (6th Edition):
Athavale, J. D. (2018). Artificial neural network based prediction and cooling energy optimization of data centers. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62620
Chicago Manual of Style (16th Edition):
Athavale, Jayati Deepak. “Artificial neural network based prediction and cooling energy optimization of data centers.” 2018. Doctoral Dissertation, Georgia Tech. Accessed January 22, 2021.
http://hdl.handle.net/1853/62620.
MLA Handbook (7th Edition):
Athavale, Jayati Deepak. “Artificial neural network based prediction and cooling energy optimization of data centers.” 2018. Web. 22 Jan 2021.
Vancouver:
Athavale JD. Artificial neural network based prediction and cooling energy optimization of data centers. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1853/62620.
Council of Science Editors:
Athavale JD. Artificial neural network based prediction and cooling energy optimization of data centers. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/62620
McMaster University
27.
RUSSEL, MD. KAMRUL.
ON ENHANCING THE PERFORMANCE OF ION DRAG ELECTROHYDRODYNAMIC (EHD) MICROPUMPS.
Degree: PhD, 2016, McMaster University
URL: http://hdl.handle.net/11375/20880
► Electrohydrodynamic (EHD) micropumps have been developed and used in many diverse applications such as in microscale liquid cooling and various microfluidic systems. The objective of…
(more)
▼ Electrohydrodynamic (EHD) micropumps have been developed and used in many diverse applications such as in microscale liquid cooling and various microfluidic systems. The objective of this research is to investigate different methods of enhancing the performance of ion drag EHD micropumps. In particular, the effect of electrode surface topology, applied electric field and doping agent in the dielectric liquid were investigated. The effect of 3D sharp features on the electrodes on charge injection in HFE 7100 as dielectric fluid was studied under an applied DC electric field. Micro and nano-scale features with high aspect ratio were developed on smooth copper electrodes by chemical etching or through electrophoretic deposition of single walled carbon nanotube (SWCNT). The spacing between the electrodes was kept at 250 µm. A reduction factor of 5 was achieved for SWCNT electrodes compared to the smooth case for the onset of charge injection. This study was then extended to determine its effects on the performance of ion drag EHD micropumps with 100 pairs of interdigitated electrodes. The emitter electrodes (20 µm) were half the width of the collector electrodes (40 µm), with one pump having an inter-electrode spacing of 120 µm and the other with 40 µm. Each micropump had a width of 5 mm and a height of 100 µm. SWCNT was deposited on the emitter electrodes of the micropump to generate a maximum static pressure of 4.7 kPa at 900 V, which is a 5 fold increase compared to the pump with smooth electrodes. Flow rate at no back pressure condition was improved by a factor of 3. The effect of Ferrocene as a doping agent in the working fluid HFE 7100 was studied under DC voltages. A maximum static pressure of 6.7 kPa was achieved at 700 V with 0.2% weight based doping agent, 11 times higher than when there was no doping agent at the same applied voltage. When there was no back pressure the pump generated a maximum flow rate of 0.47 mL/min at 700 V with 0.05% doping agent which is 9 times greater than with no doping agent. The effect of pulsed voltage on the performance of ion drag EHD micropump has been studied to exploit the displacement current at the sudden change of applied voltage magnitude. A range of pulse repetition rate and duty cycle were found to significantly enhance the pump performance. Static pressure generation was up to 75% and 88% greater at an optimal pulse repetition rate and duty cycle, respectively, compared to the average of the two DC levels. The effect of external flow on the discharge characteristics of an injection micropump was studied with DC volts. Higher discharge current and lower threshold voltage for the onset of charge injection in case of co-flow compared to the static case was observed. There was an optimum flow rate to generate maximum current for both co and counter-flow cases.
Thesis
Doctor of Philosophy (PhD)
Advisors/Committee Members: Ching, Chan, Selvaganapathy, Ponnambalam, Mechanical Engineering.
Subjects/Keywords: Thermal Management; Liquid Cooling; Micropump; Electrohydrodynamics (EHD)
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APA (6th Edition):
RUSSEL, M. K. (2016). ON ENHANCING THE PERFORMANCE OF ION DRAG ELECTROHYDRODYNAMIC (EHD) MICROPUMPS. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/20880
Chicago Manual of Style (16th Edition):
RUSSEL, MD KAMRUL. “ON ENHANCING THE PERFORMANCE OF ION DRAG ELECTROHYDRODYNAMIC (EHD) MICROPUMPS.” 2016. Doctoral Dissertation, McMaster University. Accessed January 22, 2021.
http://hdl.handle.net/11375/20880.
MLA Handbook (7th Edition):
RUSSEL, MD KAMRUL. “ON ENHANCING THE PERFORMANCE OF ION DRAG ELECTROHYDRODYNAMIC (EHD) MICROPUMPS.” 2016. Web. 22 Jan 2021.
Vancouver:
RUSSEL MK. ON ENHANCING THE PERFORMANCE OF ION DRAG ELECTROHYDRODYNAMIC (EHD) MICROPUMPS. [Internet] [Doctoral dissertation]. McMaster University; 2016. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/11375/20880.
Council of Science Editors:
RUSSEL MK. ON ENHANCING THE PERFORMANCE OF ION DRAG ELECTROHYDRODYNAMIC (EHD) MICROPUMPS. [Doctoral Dissertation]. McMaster University; 2016. Available from: http://hdl.handle.net/11375/20880
University of Limerick
28.
Richardson, Niamh.
The thermal-hydraulic characterisation of a microchannel heat exchanger for use in next generation photonic integrated circuits.
Degree: 2020, University of Limerick
URL: http://hdl.handle.net/10344/9310
► peer-reviewed
The context of this thesis is a microfluidic thermal management solution for a transceiver photonics integrated circuit (PIC), a device that forms the backbone…
(more)
▼ peer-reviewed
The context of this thesis is a microfluidic thermal management solution for a transceiver photonics integrated circuit (PIC), a device that forms the backbone of optical telecommunication networks. The PIC features laser bar arrays which, due to their small footprint, generate heat fluxes of order ~103 W/cm2. Moreover, the lasers must be maintained to within ± 0.1 K of their operating temperature to minimise wavelength changes. To meet increased bandwidth demands, higher laser densities are necessary within transceiver PICs. However, today’s air-cooling technology is limiting development. Macro-thermoelectric coolers and resistive heaters, used to control laser temperature, add to the inefficiency of contemporary technology. In addition, an uneven spreading of heat exists within a laser array due to thermal cross talk. A combination of microthermoelectrics and integrated microfluidics has been proposed, within the EU-funded TIPS consortium, to thermally control laser arrays, enabling higher laser densities and, therefore, higher data throughput within transceiver PIC packages. The overall objective of this thesis is to thermally and hydraulically characterise a rectangular microchannel heat exchanger in order to assess its feasibility as a thermal control solution for next generation transceiver PICs. To examine the thermal conditions within a transceiver PIC in order to obtain a thermal baseline for microfluidic testing, an active III/V laser device was thermally characterised across a range of power dissipations (0 – 375 mW). Silicon microfluidic test chips, with integrated microchannel and heater structures, were thermally and hydraulically characterised to demonstrate the effectiveness of microfluidics as a thermal management solution. The rectangular microchannel heat exchanger, 500 µm x 250 µm in section, was characterised across flow rates ranging from 2 – 20 ml/min (Re = 93 – 931) and under a range of heating conditions. The effect of flow rate on the heater surface temperature was recorded using IR thermography, with flow parameters measured using a flow meter, manometry and thermal sensors. The cooling effect of the fluid on the complete array of heater structures while powered simultaneously was examined. To improve the resolution of the IR thermography, heater power dissipation was increased, and single heaters were thermally characterised at higher heat fluxes. This research found that with an increase in fluid flow rate from 2 – 20 ml/min, heater surface temperature decreased for all heaters and heating conditions, and the change in heater surface temperature due to a variation in flow rate was determined to be largely independent of heater streamwise position and power dissipation. Above a flow rate of 12 ml/min, enhanced convective cooling effects were found to diminish while pumping power requirements continued to increase, indicating towards an optimal flow rate for thermal control and minimised operating costs. Above a flow rate of 12 ml/min, heater surface temperatures were found…
Advisors/Committee Members: Punch, Jeff, Dalton, Eric D., ERC.
Subjects/Keywords: microfluidic thermal management solution; circuits; telecommunication networks
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APA (6th Edition):
Richardson, N. (2020). The thermal-hydraulic characterisation of a microchannel heat exchanger for use in next generation photonic integrated circuits. (Thesis). University of Limerick. Retrieved from http://hdl.handle.net/10344/9310
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Richardson, Niamh. “The thermal-hydraulic characterisation of a microchannel heat exchanger for use in next generation photonic integrated circuits.” 2020. Thesis, University of Limerick. Accessed January 22, 2021.
http://hdl.handle.net/10344/9310.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Richardson, Niamh. “The thermal-hydraulic characterisation of a microchannel heat exchanger for use in next generation photonic integrated circuits.” 2020. Web. 22 Jan 2021.
Vancouver:
Richardson N. The thermal-hydraulic characterisation of a microchannel heat exchanger for use in next generation photonic integrated circuits. [Internet] [Thesis]. University of Limerick; 2020. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10344/9310.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Richardson N. The thermal-hydraulic characterisation of a microchannel heat exchanger for use in next generation photonic integrated circuits. [Thesis]. University of Limerick; 2020. Available from: http://hdl.handle.net/10344/9310
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Ontario Institute of Technology
29.
Sevinchan, Eren.
Investigation of thermal management options for robots.
Degree: 2018, University of Ontario Institute of Technology
URL: http://hdl.handle.net/10155/959
► This thesis research studies the thermal challenges of robots and evaluates the potential thermal management options. In this regard, it aims to develop and analyze…
(more)
▼ This thesis research studies the
thermal challenges of robots and evaluates the potential
thermal management options. In this regard, it aims to develop and analyze various
thermal management options for robotic systems. Ten different
thermal management options are investigated theoretically in this thesis, such as forced air/liquid systems, heat pipes,
thermal interface materials, thermoelectric generators, phase change materials,
thermal insulating materials, etc. Three different
thermal insulating materials (namely stone wool, fiberglass, and extruded polyurethane) and an air heating/cooling
thermal management system are tested at both high and low temperatures. At 40???C, the energy efficiencies for the utilization of these
thermal insulating materials are obtained 47.34% for the stone wool, 48.09% for the fiberglass, and 32% for the extruded polyurethane. At the same temperature, the exergy efficiencies for the utilization of these
thermal insulating materials are 23.66% for the stone wool, 18.19% for the fiberglass, and 20.73% for the extruded polyurethane. At the -25???C, the energy efficiencies are 49.91% for the stone wool, 48.24% for the fiberglass, and 31.31% for the extruded polyurethane, while the exergy efficiencies for the stone wool, fiberglass, and extruded polyurethane are 17.25%, 21%, and 21.12%, respectively. On the other hand, the energy efficiency of the air cooling system is obtained 37.58% at 40???C, while the exergy efficiency is 5.89%. Finally, at -25???C, the energy efficiency of the air heating
thermal management system is 27.32%, and its exergy efficiency becomes 3.60%, respectively.
Advisors/Committee Members: Dincer, Ibrahim, Lang, Haoxiang.
Subjects/Keywords: Robots; Thermal management; Efficiency; Heating; Cooling
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APA (6th Edition):
Sevinchan, E. (2018). Investigation of thermal management options for robots. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/959
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sevinchan, Eren. “Investigation of thermal management options for robots.” 2018. Thesis, University of Ontario Institute of Technology. Accessed January 22, 2021.
http://hdl.handle.net/10155/959.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sevinchan, Eren. “Investigation of thermal management options for robots.” 2018. Web. 22 Jan 2021.
Vancouver:
Sevinchan E. Investigation of thermal management options for robots. [Internet] [Thesis]. University of Ontario Institute of Technology; 2018. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10155/959.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sevinchan E. Investigation of thermal management options for robots. [Thesis]. University of Ontario Institute of Technology; 2018. Available from: http://hdl.handle.net/10155/959
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Clemson University
30.
Tao, Xinran (William).
Design, Modeling and Control of a Thermal Management System for Hybrid Electric Vehicles.
Degree: PhD, Mechanical Engineering, 2016, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/1631
► Hybrid electric vehicle (HEV) technology has evolved in the last two decades to become economically feasible for mass produced automobiles. With the integration of a…
(more)
▼ Hybrid electric vehicle (HEV) technology has evolved in the last two decades to become economically feasible for mass produced automobiles. With the integration of a lithium battery pack and electric motors, HEVs offer a significantly higher fuel efficiency than traditional vehicles that are driven solely by an internal combustion engine. However, the additional HEV components also introduce new challenges for the powertrain
thermal management system design. In addition to the common internal combustion engine, the battery pack, the generator(s), as well as the electric motor(s) are now widely applied in the HEVs and have become new heat sources and they also require proper
thermal management. Conventional cooling systems have been typically equipped with a belt driven water pump and radiator fan, as well as other mechanical actuators such as the thermostat valve. The operation of these components is generally determined by the engine speed. This open-loop cooling strategy has a low efficiency and suffers the risk of over-cooling the coolant and components within the system. In advanced
thermal management systems, the mechanical elements are upgraded by computer controlled actuators including a servo-motor driven pump, variable speed fans, a smart thermostat, and an electric motor driven compressor. These electrified actuators offer the opportunity to improve temperature tracking and reduce parasitic losses. This dissertation investigates a HEV powertrain
thermal management system featuring computer controlled cooling system actuators. A suite of mathematical models have been created to describe the
thermal behaviour of the HEV powertrain components. Model based controllers were developed for the vehicle's cooling systems including the battery pack, electric motors, and internal combustion engine. Optimal control theory has been applied to determine the ideal battery cooling air temperature and the desired heat removal rate on e-motor cooling surface. A model predictive controller(MPC) was developed to regulate the refrigerant compressor and track the battery cooling air temperature. A series of Lyapunov-based nonlinear controllers have been implemented to regulate the coolant pumps and radiator fans in the cooling systems for the engine and e-motors. Representative numerical results are presented and discussed. Overall, the proposed control strategies have demonstrated the effectiveness in improving both the temperature tracking performance and the cooling system power consumption reduction. The peak temperature error in the selected A123 battery core can be tracked within 0.25 C of the target; a 50% reduction of the vapor compression system energy consumption can be obtained by properly designing the cooling air flow structure. Similarly, the cooling system of HEV electric motors shows that the machine internal peak temperature can be tracked to the target value with a maximum error of 3.9 C and an average error of 0.13 C. A 70% to 81% cooling system energy consumption reduction can be…
Advisors/Committee Members: Dr. John R. Wagner, Committee Chair, Dr. Richard S. Miller, Dr. Todd Schweisinger, Dr. Ardalan Vahidi.
Subjects/Keywords: Battery; Controller; Hybrid Electric Vehicle; Thermal Management
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APA (6th Edition):
Tao, X. (. (2016). Design, Modeling and Control of a Thermal Management System for Hybrid Electric Vehicles. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1631
Chicago Manual of Style (16th Edition):
Tao, Xinran (William). “Design, Modeling and Control of a Thermal Management System for Hybrid Electric Vehicles.” 2016. Doctoral Dissertation, Clemson University. Accessed January 22, 2021.
https://tigerprints.clemson.edu/all_dissertations/1631.
MLA Handbook (7th Edition):
Tao, Xinran (William). “Design, Modeling and Control of a Thermal Management System for Hybrid Electric Vehicles.” 2016. Web. 22 Jan 2021.
Vancouver:
Tao X(. Design, Modeling and Control of a Thermal Management System for Hybrid Electric Vehicles. [Internet] [Doctoral dissertation]. Clemson University; 2016. [cited 2021 Jan 22].
Available from: https://tigerprints.clemson.edu/all_dissertations/1631.
Council of Science Editors:
Tao X(. Design, Modeling and Control of a Thermal Management System for Hybrid Electric Vehicles. [Doctoral Dissertation]. Clemson University; 2016. Available from: https://tigerprints.clemson.edu/all_dissertations/1631
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Open Access Theses and Dissertations
