You searched for subject:(Cooling).
Showing records 1 – 30 of
2586 total matches.
◁ [1] [2] [3] [4] [5] … [87] ▶
Baylor University
1.
[No author].
Experimental investigation of full coverage combustor film cooling and airfoil film cooling for advanced gas turbines engines.
Degree: 2017, Baylor University
URL: http://hdl.handle.net/2104/10081 
► Film cooling in modern gas turbine engines uses coolant from the compressor to protect the surface of the combustor lining and turbine airfoils from the…
(more)
▼ Film
cooling in modern gas turbine engines uses coolant from the compressor to protect the surface of the combustor lining and turbine airfoils from the hot mainstream gas. Pressure sensitive paint (PSP) is used to evaluate the effects of effusion
cooling and hole shape for combustion film
cooling. Results show that increasing row interaction increases superposition and lateral spreading of the coolant. PSP and stereoscopic particle image velocimetry (S-PIV) are used to investigate the effect of favorable pressure gradients and hole shape for turbine airfoil film
cooling. Three-dimensional velocity and vorticity distributions obtained with S-PIV are coupled with the film
cooling effectiveness distributions determined with PSP for six film
cooling geometries. Results show that a favorable pressure gradient reduces jet separation and increases lateral spreading of coolant. Furthermore, adding contours to the hole shape can generate additional anti-kidney vortices and adding a racetrack shaped inlet improved film
cooling effectiveness.
Advisors/Committee Members: Wright, Lesley Mae (advisor).
Subjects/Keywords: Film cooling.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
author], [. (2017). Experimental investigation of full coverage combustor film cooling and airfoil film cooling for advanced gas turbines engines.
(Thesis). Baylor University. Retrieved from http://hdl.handle.net/2104/10081
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. “Experimental investigation of full coverage combustor film cooling and airfoil film cooling for advanced gas turbines engines.
” 2017. Thesis, Baylor University. Accessed February 18, 2020.
http://hdl.handle.net/2104/10081.
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. “Experimental investigation of full coverage combustor film cooling and airfoil film cooling for advanced gas turbines engines.
” 2017. Web. 18 Feb 2020.
Vancouver:
author] [. Experimental investigation of full coverage combustor film cooling and airfoil film cooling for advanced gas turbines engines.
[Internet] [Thesis]. Baylor University; 2017. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/2104/10081.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
author] [. Experimental investigation of full coverage combustor film cooling and airfoil film cooling for advanced gas turbines engines.
[Thesis]. Baylor University; 2017. Available from: http://hdl.handle.net/2104/10081
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Baylor University
2.
[No author].
Effect of inlet hole geometry on surface film cooling effectiveness from compound angle, shaped holes.
Degree: 2018, Baylor University
URL: http://hdl.handle.net/2104/10370
► The gas turbine engine operates at temperatures that far exceed the melting point of the metals from which they are made. Cooling air from the…
(more)
▼ The gas turbine engine operates at temperatures that far exceed the melting point of the metals from which they are made.
Cooling air from the high pressure compressor must be used to cool the components in the hot sections of the turbine engines. Coolant must be used as effectively as possible in order to increase engine efficiency. The Pressure Sensitive Paint technique (PSP) is used to evaluate the effects of both compound angles and advanced shapes on the film
cooling effectiveness. Most current film
cooling geometries are orientated streamwise, with mainstream flow, and the addition of the compound angle has shown to both positive and negative effects on
cooling effectiveness. These changes are seen based on the type of inlet,
cooling geometry, and expansion of the outlet geometry onto the surface.
Advisors/Committee Members: Wright, Lesley Mae (advisor).
Subjects/Keywords: Film cooling.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
author], [. (2018). Effect of inlet hole geometry on surface film cooling effectiveness from compound angle, shaped holes.
(Thesis). Baylor University. Retrieved from http://hdl.handle.net/2104/10370
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. “Effect of inlet hole geometry on surface film cooling effectiveness from compound angle, shaped holes.
” 2018. Thesis, Baylor University. Accessed February 18, 2020.
http://hdl.handle.net/2104/10370.
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. “Effect of inlet hole geometry on surface film cooling effectiveness from compound angle, shaped holes.
” 2018. Web. 18 Feb 2020.
Vancouver:
author] [. Effect of inlet hole geometry on surface film cooling effectiveness from compound angle, shaped holes.
[Internet] [Thesis]. Baylor University; 2018. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/2104/10370.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
author] [. Effect of inlet hole geometry on surface film cooling effectiveness from compound angle, shaped holes.
[Thesis]. Baylor University; 2018. Available from: http://hdl.handle.net/2104/10370
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Halmstad University
3.
Åhlund, Anton.
Solar Cooling : -A study of two thermal systems.
Degree: Energy Science, 2015, Halmstad University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28454
► Electricity-driven air-conditioning is energy-intensive and puts a strain to many grids during hot periods in warm climates. Solar thermal cooling could be an alternative…
(more)
▼ Electricity-driven air-conditioning is energy-intensive and puts a strain to many grids during hot periods in warm climates. Solar thermal cooling could be an alternative to conventional cooling, using a renewable energy source and supplying the most energy during peak demand periods with insignificant effect to the electric grid. Office buildings in warm climates have high cooling loads, naturally peaking during daytime because of occupancy and ambient temperature. Thus, office buildings have a seemingly advantageous relationship between the possible supply of solar thermal energy and cooling demand. With this background, solar cooling systems for two office buildings with the same dimensions are investigated, placed in a tropical- and a sub-tropical location. There are great differences in the design conditions for solar cooling systems in the tropics and the sub-tropics, between the chosen locations Manila and Abu Dhabi more specifically. Manila has a quite evenly distributed cooling load while Abu Dhabi has a strongly pronounced summer season with very high maximum cooling loads, while the winter temperatures are relatively low. The prior described conditions creates a big difference between loads throughout the year, making a thermal chiller less effective in this aspect. However Abu Dhabi is expected to have an overall smoother- and ultimately a more high performance solar cooling system due to lower humidity, which facilitates the important cooling of the chiller. Evacuated tube collectors were used at both sites, where the collectors in Manila needs to be larger relative to the chiller cooling capacity, in order to compensate for the irregularity of direct solar radiation. The electricity price in Abu Dhabi is too low for the solar cooling system to be economically feasible compared to a conventional system, where the net values over 20 years are 163 000 € and 127 000 €, respectively. Manila has on its hand a very high price for electricity, making the 20-year net values for both the solar cooling- and the conventional system approximately 170 000 €.
Subjects/Keywords: solar cooling; thermal cooling; absorption cooling; adsorption cooling; tropics; sub-tropics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Åhlund, A. (2015). Solar Cooling : -A study of two thermal systems. (Thesis). Halmstad University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28454
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):
Åhlund, Anton. “Solar Cooling : -A study of two thermal systems.” 2015. Thesis, Halmstad University. Accessed February 18, 2020.
http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28454.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Åhlund, Anton. “Solar Cooling : -A study of two thermal systems.” 2015. Web. 18 Feb 2020.
Vancouver:
Åhlund A. Solar Cooling : -A study of two thermal systems. [Internet] [Thesis]. Halmstad University; 2015. [cited 2020 Feb 18].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28454.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Åhlund A. Solar Cooling : -A study of two thermal systems. [Thesis]. Halmstad University; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28454
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
4.
Korniliou, Sofia.
Ébullition dans les micro canaux : influence du rapport d'aspect sur le transfert thermique local : Local heat transfer measurements and aspect ratio influence during flow boiling in microscale.
Degree: Docteur es, Mécanique. Énergétique, matériaux, 2018, Valenciennes; University of Edinburgh
URL: http://www.theses.fr/2018VALE0002
► L’ébullition en micros canaux est une technique de refroidissement très prometteuse pour les composants en microélectronique. Ces derniers, de plus en plus miniaturisés, nécessitent souvent…
(more)
▼ L’ébullition en micros canaux est une technique de refroidissement très prometteuse pour les composants en microélectronique. Ces derniers, de plus en plus miniaturisés, nécessitent souvent la dissipation de densités de flux importantes, pouvant atteindre quelques MW m-2 pour maintenir des températures acceptables. L’objet de cette étude est de mieux comprendre les instabilités des écoulements, le transfert thermique par changement de phase tout comme l’effet des rapports de forme (a) sur l’apparition de sites de nucléation à la surface de micro canaux. L’analyse des échanges convectifs locaux lors de l’ébullition a été réalisée dans le cas de micro canaux de rapport de forme allant de 0.3 à 3 et de diamètres hydrauliques allant de 50 à 150 μm. Le banc d’essai a été instrumenté de manière à pourvoir mesurer simultanément les températures de surface à l’aide capteurs en film mince de nickel, de capteurs de pressions instantanées et de caméra rapide pour la visualisation du phénomène d’ébullition. Le chauffage du fluide a été réalisé à l’aide du dépôt en couche mince d’un film résistif en aluminium directement appliqué à la surface des micro canaux. L’étude expérimentale a permis d’analyser les phénomènes de changement de phase par ébullition, du transfert thermique local ainsi que la chute de pression de l’écoulement. En particulier, le travail expérimental a permis de mettre en évidence les effets sur le transfert, du rapport de forma a, de la température de sous refroidissement du fluide à l’entrée des canaux et de la dynamique de formation et de grossissement des bulles. Des fluctuations importantes de pression et de températures ont été enregistrées pour des températures de surfaces avoisinant les 250 °C. Les micro canaux avec a= 1.5 et Dh =120 μm, correspondent à la configuration la plus performante. Les mesures par thermographie infrarouge (IR) combinées à la visualisation par caméra rapide et aux mesures des fluctuations de pressions par capteurs piézoresitifs, ont été réalisées dans le cas de canaux en Polydimethylsiloxane (PDMS) de grand rapport de forme (a = 22) et de diamètre hydraulique Dh =192 μm. L’objectif était d’identifier des cartographies bidimensionnelles et instationnaires de coefficients d’échanges convectifs dans le cas d’un micro canal utilisant un fluide diélectrique le FC -72. La double visualisation par thermographie infrarouge et par caméra CCD rapide a permis de corréler la dynamique de l’ébullition, et notamment le grossissement des bulles, l’asséchement et ou le mouillage des parois, aux coefficients d’échanges convectifs locaux.
Flow boiling in microchannels is a promising technology for cooling of small-scale devices such as electronic chips, power rectifiers, radar arrays, chemical microreactors that require dissipating heat fluxes of several MW m-2 while maintaining constant temperature at the surface. Although flow boiling in macroscale provides higher performance than single-phase or pool boiling heat transfer, the advantages in microscale have not been yet completely justified.…
Advisors/Committee Members: Harmand, Souad (thesis director), Sefiane, Khellil (thesis director).
Subjects/Keywords: Refroidissement; Cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Korniliou, S. (2018). Ébullition dans les micro canaux : influence du rapport d'aspect sur le transfert thermique local : Local heat transfer measurements and aspect ratio influence during flow boiling in microscale. (Doctoral Dissertation). Valenciennes; University of Edinburgh. Retrieved from http://www.theses.fr/2018VALE0002
Chicago Manual of Style (16th Edition):
Korniliou, Sofia. “Ébullition dans les micro canaux : influence du rapport d'aspect sur le transfert thermique local : Local heat transfer measurements and aspect ratio influence during flow boiling in microscale.” 2018. Doctoral Dissertation, Valenciennes; University of Edinburgh. Accessed February 18, 2020.
http://www.theses.fr/2018VALE0002.
MLA Handbook (7th Edition):
Korniliou, Sofia. “Ébullition dans les micro canaux : influence du rapport d'aspect sur le transfert thermique local : Local heat transfer measurements and aspect ratio influence during flow boiling in microscale.” 2018. Web. 18 Feb 2020.
Vancouver:
Korniliou S. Ébullition dans les micro canaux : influence du rapport d'aspect sur le transfert thermique local : Local heat transfer measurements and aspect ratio influence during flow boiling in microscale. [Internet] [Doctoral dissertation]. Valenciennes; University of Edinburgh; 2018. [cited 2020 Feb 18].
Available from: http://www.theses.fr/2018VALE0002.
Council of Science Editors:
Korniliou S. Ébullition dans les micro canaux : influence du rapport d'aspect sur le transfert thermique local : Local heat transfer measurements and aspect ratio influence during flow boiling in microscale. [Doctoral Dissertation]. Valenciennes; University of Edinburgh; 2018. Available from: http://www.theses.fr/2018VALE0002
Baylor University
5.
Harmon, Weston V.
An experimental investigation of round and racetrack shaped jets for leading edge region cooling of gas turbine blades.
Degree: Mechanical Engineering., 2014, Baylor University
URL: http://hdl.handle.net/2104/9158
► Jet impingement is often utilized in the leading edge of actively cooled turbine airfoils to protect the blades from the extreme heat loads encountered within…
(more)
▼ Jet impingement is often utilized in the leading edge of actively cooled turbine airfoils to protect the blades from the extreme heat loads encountered within the engine. This thesis will discuss two experimental investigations that employ a traditional, steady state, copper plate technique to obtain regionally averaged Nusselt numbers on a concave surface, which models the leading edge of a turbine blade. The first experiment will investigate the effect of jet shape, orifice edge condition, jet-to-jet spacing, and relative jet length. The effect of inlet supply condition will also be investigated by implementing a radial bypass. The second experiment investigates the effect of rotation on both round and racetrack shaped impinging jets. Results show that racetrack shaped jets generally outperform circular jets both in a stationary test section, and under rotating conditions. Further, the effects of non-square edge conditions and radial bypass prove to be detrimental to heat transfer.
Advisors/Committee Members: Wright, Lesley Mae (advisor).
Subjects/Keywords: Impingement cooling.;
Gas turbine cooling.;
Rotating impingement.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Harmon, W. V. (2014). An experimental investigation of round and racetrack shaped jets for leading edge region cooling of gas turbine blades.
(Thesis). Baylor University. Retrieved from http://hdl.handle.net/2104/9158
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):
Harmon, Weston V. “An experimental investigation of round and racetrack shaped jets for leading edge region cooling of gas turbine blades.
” 2014. Thesis, Baylor University. Accessed February 18, 2020.
http://hdl.handle.net/2104/9158.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Harmon, Weston V. “An experimental investigation of round and racetrack shaped jets for leading edge region cooling of gas turbine blades.
” 2014. Web. 18 Feb 2020.
Vancouver:
Harmon WV. An experimental investigation of round and racetrack shaped jets for leading edge region cooling of gas turbine blades.
[Internet] [Thesis]. Baylor University; 2014. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/2104/9158.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Harmon WV. An experimental investigation of round and racetrack shaped jets for leading edge region cooling of gas turbine blades.
[Thesis]. Baylor University; 2014. Available from: http://hdl.handle.net/2104/9158
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
The Ohio State University
6.
Kheniser, Issam E.
Film Cooling Experiments in a Medium Duration Blowdown
Facility.
Degree: MS, Mechanical Engineering, 2010, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1276540410
► As gas turbine engines are driven to be more efficient, quiet, and to produce less pollutant the turbine inlet temperature has a tendency to…
(more)
▼ As gas turbine engines are driven to be more
efficient, quiet, and to produce less pollutant the turbine inlet
temperature has a tendency to be driven upwards. The life of a
turbine engine component decreases dramatically as the metal
temperature increases. Because film
cooling of high-pressure
turbine airfoils has become common practice, improving the ability
to predict film-
cooling effectiveness is a critical problem of
interest. Finding better, more efficient ways to use the
cooling
air is far preferable to using more of it. However, even if a given
cooling-hole configuration proves to be effective in a flat-plate
environment (which is the test article of interest in this thesis),
it may not be effective on a turbine blade that is exposed to
dynamic conditions that cannot be easily
replicated. The goal of the experiment reported
here is to measure the film effectiveness for a blowing ratio,
temperature ratio and free stream Mach number, all similar to those
experienced by the pressure surface of a rotating blade turbine
blade with the same
cooling-hole configuration, but for the
flat-plate test article noted above. The
cooling gas flow will be
initiated earlier than the main flow to allow for proper setup of
the
cooling flow. This data will be used as a comparison to
simulation results obtained using the CFD code Fine TURBO. It is
shown in this work that the
cooling-gas supply system interaction
with the external gas supply associated with the blowdown facility
process is not simple, and the current model used to design the
experiment is not as good as it could have been. The effect of
cooling was observed and the data closely resembled the simulations
done using the CFD code Fine TURBO. Unfortunately, due to problems
with the double-sided Kapton heat-flux gauges, heat flux data was
not obtained in the immediate vicinity of the
cooling holes.
Solutions to the problems encountered in this experiment are
relatively straightforward and are
presented.
Advisors/Committee Members: Dunn, Michael (Advisor).
Subjects/Keywords: Mechanical Engineering; Blowdown; Film; cooling; film-cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kheniser, I. E. (2010). Film Cooling Experiments in a Medium Duration Blowdown
Facility. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1276540410
Chicago Manual of Style (16th Edition):
Kheniser, Issam E. “Film Cooling Experiments in a Medium Duration Blowdown
Facility.” 2010. Masters Thesis, The Ohio State University. Accessed February 18, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1276540410.
MLA Handbook (7th Edition):
Kheniser, Issam E. “Film Cooling Experiments in a Medium Duration Blowdown
Facility.” 2010. Web. 18 Feb 2020.
Vancouver:
Kheniser IE. Film Cooling Experiments in a Medium Duration Blowdown
Facility. [Internet] [Masters thesis]. The Ohio State University; 2010. [cited 2020 Feb 18].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1276540410.
Council of Science Editors:
Kheniser IE. Film Cooling Experiments in a Medium Duration Blowdown
Facility. [Masters Thesis]. The Ohio State University; 2010. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1276540410
Virginia Tech
7.
Leblanc, Christopher N.
Design, Analysis, and Development of a Tripod Film Cooling Hole Design for Reduced Coolant Usage.
Degree: PhD, Mechanical Engineering, 2012, Virginia Tech
URL: http://hdl.handle.net/10919/19206
► This research has a small portion focused on interior serpentine channels, with the primary focus on improving the effectiveness of the film cooling technique through…
(more)
▼ This research has a small portion focused on interior serpentine channels, with the primary focus on improving the effectiveness of the film
cooling technique through the use of a new approach to film
cooling. This new approach uses a set of three holes sharing the same inlet and diverging from the central hole to form a three-legged, or tripod, design. The tripod design is examined in depth, in terms of geometric variations, through the use of flat plate and cascade rigs, with both transient and steady-state experiments. The flat plate tests provide a simplified setting in which to test the design in comparison to other geometries, and establish a baseline performance in a simple flow field that does not have the complications of surface curvature or mainstream pressure gradients. Cascade tests allow for testing of the design in a more realistic setting with curved surfaces and mainstream pressure gradients, providing important information about the performance of the design on suction and pressure surfaces of airfoils. Additionally, the cascade tests allow for an investigation into the aerodynamic penalties associated with the injection hole designs at various flow rates. Through this procedure the current state of film
cooling technology may be improved, with more effective surface coverage achieved with reduced coolant usage, and with reduced performance penalties for the engine as a whole. This research has developed a new film hole design that is manufacturable and durable, and provides a detailed analysis of its performance under a variety of flow conditions. This
cooling hole design provides 40% higher
cooling effectiveness while using 50% less coolant mass flow. The interior serpentine channel research provides comparisons between correlations and experiments for internal passages with realistic cross sections.
Advisors/Committee Members: Ekkad, Srinath V. (committeechair), Roy, Christopher John (committee member), Tafti, Danesh K. (committee member), Diller, Thomas E. (committee member), Ng, Wing Fai (committee member).
Subjects/Keywords: Heat Transfer; Gas Turbine Cooling; Film Cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Leblanc, C. N. (2012). Design, Analysis, and Development of a Tripod Film Cooling Hole Design for Reduced Coolant Usage. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/19206
Chicago Manual of Style (16th Edition):
Leblanc, Christopher N. “Design, Analysis, and Development of a Tripod Film Cooling Hole Design for Reduced Coolant Usage.” 2012. Doctoral Dissertation, Virginia Tech. Accessed February 18, 2020.
http://hdl.handle.net/10919/19206.
MLA Handbook (7th Edition):
Leblanc, Christopher N. “Design, Analysis, and Development of a Tripod Film Cooling Hole Design for Reduced Coolant Usage.” 2012. Web. 18 Feb 2020.
Vancouver:
Leblanc CN. Design, Analysis, and Development of a Tripod Film Cooling Hole Design for Reduced Coolant Usage. [Internet] [Doctoral dissertation]. Virginia Tech; 2012. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/10919/19206.
Council of Science Editors:
Leblanc CN. Design, Analysis, and Development of a Tripod Film Cooling Hole Design for Reduced Coolant Usage. [Doctoral Dissertation]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/19206
University of Arizona
8.
Rupper, Greg.
Theory of Semiconductor Laser Cooling
.
Degree: 2010, University of Arizona
URL: http://hdl.handle.net/10150/194520
► Recently laser cooling of semiconductors has received renewed attention, with the hope that a semiconductor cooler might be able to achieve cryogenic temperatures. In order…
(more)
▼ Recently laser
cooling of semiconductors has received renewed attention, with the hope that a semiconductor cooler might be able to achieve cryogenic temperatures. In order to study semiconductor laser
cooling at cryogenic temperatures, it is crucial that the theory include both the effects of excitons and the electron-hole plasma. In this dissertation, I present a theoreticalanalysis of laser
cooling of bulk GaAs based on a microscopic many-particle theory of absorptionand luminescence of a partially ionized electron-hole plasma.This theory has been analyzed from a temperature 10K to 500K. It is shown that at high temperatures (above 300K),
cooling can be modeled using older models with a few parameter changes. Below 200K, band filling effects dominate over Auger recombination. Below 30K excitonic effects are essential for laser
cooling. In all cases, excitonic effects make
cooling easier then predicted by a free carrier model.The initial
cooling model is based on the assumption of a homogeneous undoped semiconductor. This model has been systematically modified to include effects that are present in real laser
cooling experiments. The following modifications have been performed. 1) Propagation and polariton effects have been included. 2) The effect of p-doping has been included. (n-doping can be modeled in a similar fashion.) 3) In experiments, a passivation layer is required to minimize non-radiative recombination. The passivation results in a npn heterostructure. The effect of the npn heterostructure on
cooling has been analyzed. 4) The effect of a Gaussian pump beam was analyzed and 5) Some of the parameters in the
cooling model have a large uncertainty. The effect of modifying these parameters has been analyzed.Most of the extensions to the original theory have only had a modest effect on the overall results. However we find that the current passivation technique may not be sufficient to allow
cooling. The passivation technique currently used appears to be very good at low densities, but loses some of it's effectiveness at the moderately high densities required for laser
cooling. We suggest one possible solution that might enable laser
cooling. If the sample can be properly passivated, then we expect laser
cooling to be possible.
Advisors/Committee Members: Binder, Rolf (advisor), Binder, Rolf (committeemember), Wright, Ewan M (committeemember), Pau, Stanley K H (committeemember).
Subjects/Keywords: Absorption;
GaAs;
laser cooling;
luminescence;
Semiconductor cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rupper, G. (2010). Theory of Semiconductor Laser Cooling
. (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/194520
Chicago Manual of Style (16th Edition):
Rupper, Greg. “Theory of Semiconductor Laser Cooling
.” 2010. Doctoral Dissertation, University of Arizona. Accessed February 18, 2020.
http://hdl.handle.net/10150/194520.
MLA Handbook (7th Edition):
Rupper, Greg. “Theory of Semiconductor Laser Cooling
.” 2010. Web. 18 Feb 2020.
Vancouver:
Rupper G. Theory of Semiconductor Laser Cooling
. [Internet] [Doctoral dissertation]. University of Arizona; 2010. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/10150/194520.
Council of Science Editors:
Rupper G. Theory of Semiconductor Laser Cooling
. [Doctoral Dissertation]. University of Arizona; 2010. Available from: http://hdl.handle.net/10150/194520
University of Ottawa
9.
Yang, Yifan.
Personal-portable Cooling Garment Based on Adsorption Vacuum Membrane Evaporative Cooling
.
Degree: 2011, University of Ottawa
URL: http://hdl.handle.net/10393/19835
► A cutting edge man-portable AVMEC cooling garment was demonstrated to be able to provide sufficient cooling for personnel working at mediate activity loads. Studies were…
(more)
▼ A cutting edge man-portable AVMEC cooling garment was demonstrated to be able to provide sufficient cooling for personnel working at mediate activity loads. Studies were first carried out in a well controlled vacuum desiccator at room temperature to elucidate the effects of several key parameters on the performance of an AVEC device, which was similar to AVMEC except that membrane was not involved. Under the best condition, an average cooling capacity of 179 W/M2 was achieved in a period of four hours and cooling continued at a slowly declining rate for another four hours afterward. The temperature of water was maintained at approximately 12.5 °C after the pseudo steady state was established. Then, it was shown that the AVMEC cooling pads were able to provide a cooling capacity of 277.4 W/m2 in a 37 °C ambient environment (incubator). The temperature of the cooling core surface was maintained in a range of 20 – 21.8 °C in the one-hour test period. No power supply was required except for the initialization stage, which took 5 minutes. Furthermore, human subject tests with or without wearing NWBC (Nuclear Warfare Biological and Chemical) suit demonstrated that, a AVMEC garment composed of 12 cooling pads were able to maintain the core body temperature of the subjects below 38.5 °C for up to 90 minutes while the subject was walking on a treadmill at a speed of 2 miles per hour in an environment of 40 °C and 50% RH (relative humidity). These results indicate that the AVMEC garment is a promising man-portable personal cooling technology.
Subjects/Keywords: adsorption;
evaporative cooling;
personal microclimate cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yang, Y. (2011). Personal-portable Cooling Garment Based on Adsorption Vacuum Membrane Evaporative Cooling
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/19835
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):
Yang, Yifan. “Personal-portable Cooling Garment Based on Adsorption Vacuum Membrane Evaporative Cooling
.” 2011. Thesis, University of Ottawa. Accessed February 18, 2020.
http://hdl.handle.net/10393/19835.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yang, Yifan. “Personal-portable Cooling Garment Based on Adsorption Vacuum Membrane Evaporative Cooling
.” 2011. Web. 18 Feb 2020.
Vancouver:
Yang Y. Personal-portable Cooling Garment Based on Adsorption Vacuum Membrane Evaporative Cooling
. [Internet] [Thesis]. University of Ottawa; 2011. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/10393/19835.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yang Y. Personal-portable Cooling Garment Based on Adsorption Vacuum Membrane Evaporative Cooling
. [Thesis]. University of Ottawa; 2011. Available from: http://hdl.handle.net/10393/19835
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
KTH
10.
Johansson, Eric.
Optimization of Ground Source Cooling Combined with Free Cooling for Protected Sites.
Degree: Applied Thermodynamics and Refrigeration, 2012, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98657
► Ground source cooling is commonly used for cooling of electronics in protected sites. Sometimes the boreholes are combined with free cooling from the air…
(more)
▼ Ground source cooling is commonly used for cooling of electronics in protected sites. Sometimes the boreholes are combined with free cooling from the air using a dry cooler to reduce the amount and length of the boreholes, which is the biggest part of the costs. The dry cooler can have two different running modes. In unloading mode the dry cooler is started at a certain temperature and the fans are slowed down at low temperatures so that the cooling power never exceeds the cooling demand. The extracted cooling is used to unload the boreholes. In recharging mode the dry cooler is started at a certain temperature and is operating at full capacity below this temperature. The excess cooling that is extracted in this mode is used to recharge the boreholes. The numerical simulation tool COMSOL Multiphysics was used to evaluate the borehole performance. The software can simulate tilted boreholes with good accuracy and makes it possible to adjust the geometry in any desired way. In this thesis, the performance of a 100 kW ground source cooling system is evaluated for a number of cases both with and without dry coolers in different running modes and sizes. The best solution in respect to life cycle cost, technical feasibility and environmental impact is chosen to be an unloading case with a dry cooler with 100 kW capacity at 8 °C. Using only boreholes gives less carbon dioxide emissions but much higher costs.
Subjects/Keywords: Cooling; Borehole; Ground Source; Free Cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Johansson, E. (2012). Optimization of Ground Source Cooling Combined with Free Cooling for Protected Sites. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98657
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):
Johansson, Eric. “Optimization of Ground Source Cooling Combined with Free Cooling for Protected Sites.” 2012. Thesis, KTH. Accessed February 18, 2020.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98657.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Johansson, Eric. “Optimization of Ground Source Cooling Combined with Free Cooling for Protected Sites.” 2012. Web. 18 Feb 2020.
Vancouver:
Johansson E. Optimization of Ground Source Cooling Combined with Free Cooling for Protected Sites. [Internet] [Thesis]. KTH; 2012. [cited 2020 Feb 18].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98657.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Johansson E. Optimization of Ground Source Cooling Combined with Free Cooling for Protected Sites. [Thesis]. KTH; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98657
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Anna University
11.
Anbazhaghan N.
Studies on biomass assisted Absorption cooling
systems;.
Degree: Studies on biomass assisted Absorption cooling
systems, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/28532
► India stands among the top five countries in fruits and vegetables newlineProduction However due to poor availability of power in rural areas only newline2 of…
(more)
▼ India stands among the top five countries in fruits
and vegetables newlineProduction However due to poor availability
of power in rural areas only newline2 of the produced vegetables is
preserved with the conventional type cold newlineStorages This
leads to loss of rural economy The conventional vapour
newlinecompression type cold storages require electrical mechanical
work for their newlineoperation and use working fluids which are
harmful to the environment In newlinethis context the vapour
absorption refrigeration type cold storages could be
newlineconsidered Since the vapour absorption refrigeration systems
are heat newlineoperated the required thermal energy could be
obtained from either waste newlineheat or renewable energy sources
newlineSince the production of fruits and vegetables is rural area
based newlinerenewable energy based heat operated absorption
systems find its applications newlineto overcome the drawbacks
mentioned earlier The biomass as the source of newlinefuel among
the renewable energy sources attracts significant attention due to
newlineits abundant availability and cost effective energy
harnessing techniques newline newline
appendix p195-235. reference
p236-244.
Advisors/Committee Members: Renganarayanan S.
Subjects/Keywords: Absorption cooling systems
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
N, A. (2014). Studies on biomass assisted Absorption cooling
systems;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/28532
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):
N, Anbazhaghan. “Studies on biomass assisted Absorption cooling
systems;.” 2014. Thesis, Anna University. Accessed February 18, 2020.
http://shodhganga.inflibnet.ac.in/handle/10603/28532.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
N, Anbazhaghan. “Studies on biomass assisted Absorption cooling
systems;.” 2014. Web. 18 Feb 2020.
Vancouver:
N A. Studies on biomass assisted Absorption cooling
systems;. [Internet] [Thesis]. Anna University; 2014. [cited 2020 Feb 18].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/28532.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
N A. Studies on biomass assisted Absorption cooling
systems;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/28532
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Baylor University
12.
Elston, Cassius A., III.
Numerical prediction and correlation of leading edge jet impingement with varying jet shapes and flow conditions for gas turbine cooling.
Degree: Mechanical Engineering., 2013, Baylor University
URL: http://hdl.handle.net/2104/8827
► To increase the core power of gas turbine engines, the combustion temperature is elevated above the metallurgical limits of the internal components. As a consequence,…
(more)
▼ To increase the core power of gas turbine engines, the combustion temperature is elevated above the metallurgical limits of the internal components. As a consequence, active
cooling schemes are required to prevent the blades from melting. In this study, a numerical investigation of leading edge impingement
cooling was performed. The effects of jet Reynolds number, jet-to-target surface spacing, jet-to-jet spacing, target surface curvature, and jet aspect ratio on the target surface Nusselt numbers were quantified. In all cases, the jets were equally spaced and had fully filleted edges. The numerical results were utilized to develop an empirical correlation for the surface average Nusselt number. The correlation enables engine designers to accurately predict the heat flux on the blade wall, as well as identify the optimal leading edge geometry to minimize the amount of
cooling air required; thus, increasing the thermal efficiency of the gas turbine engine.
Advisors/Committee Members: Wright, Lesley Mae (advisor).
Subjects/Keywords: Gas turbine cooling.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Elston, Cassius A., I. (2013). Numerical prediction and correlation of leading edge jet impingement with varying jet shapes and flow conditions for gas turbine cooling.
(Thesis). Baylor University. Retrieved from http://hdl.handle.net/2104/8827
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):
Elston, Cassius A., III. “Numerical prediction and correlation of leading edge jet impingement with varying jet shapes and flow conditions for gas turbine cooling.
” 2013. Thesis, Baylor University. Accessed February 18, 2020.
http://hdl.handle.net/2104/8827.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Elston, Cassius A., III. “Numerical prediction and correlation of leading edge jet impingement with varying jet shapes and flow conditions for gas turbine cooling.
” 2013. Web. 18 Feb 2020.
Vancouver:
Elston, Cassius A. I. Numerical prediction and correlation of leading edge jet impingement with varying jet shapes and flow conditions for gas turbine cooling.
[Internet] [Thesis]. Baylor University; 2013. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/2104/8827.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Elston, Cassius A. I. Numerical prediction and correlation of leading edge jet impingement with varying jet shapes and flow conditions for gas turbine cooling.
[Thesis]. Baylor University; 2013. Available from: http://hdl.handle.net/2104/8827
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
13.
Anwarulla, Mohammad.
Experimental and theoretical investigation on the effect
of geometric parameters in electronic component cooling using jet
impingement.
Degree: Mechanical Engineering, 2011, Jawaharlal Nehru Technological University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/3483
► The present work deals with experimental and theoretical investigation on the effect of geometric parameters on the cooling of electronic components and sub assemblies in…
(more)
▼ The present work deals with experimental and
theoretical investigation on the effect of geometric parameters on
the cooling of electronic components and sub assemblies in an air
jet impingement cooling. To begin with an extensive literature
survey has been conducted from the published literature and
critically reviewed. In the process of literature review more than
100 relevant research papers are collected and a critical review is
carried out to understand the state of the art in chosen field of
investigation. Gaps in the published scientific literature are
identified and the lacuna is high lighted. The present experimental
investigation is an attempt to bridge some of the identified lacuna
in the literature. As a part of the present experimental
investigation a test rig has been designed, developed, fabricated,
tested and commissioned keeping in view of the functional and
operational requirements. Heat transfer coefficient have been
determined in the temperature range of 30 to 1000 C of component
temperature and in the range of Reynolds numbers from 5850 to 85000
of the jet. The geometric parameters like diameter of the jet and
the distance between the nozzle exit and the target have been
varied between 2 to 10. Three different geometric shapes of the
nozzle, viz., circular, square and rectangular, have been
investigated in the present work. The measured values of heat
transfer coefficient are non-XII dimensionlised. Variations of non
dimensional heat transfer coefficient have been represented as a
function of geometric and flow parameters. New correlations are
proposed based on the present experimental investigation. Results
of the present work are compared with the published literature and
discussed. Effect of nozzle aspect ratio on heat transfer rates
decrease as the nozzle to electronic component spacing increases.
The effect of nozzle aspect ratio on heat transfer is practically
independent of the jet Reynolds number. The experimental results of
the present investigation provide a good under standing of the
fluid flow and heat transfer characteristics of air impinging jets.
Uncertainty analysis has been conducted and typical range of
uncertainty is also presented. Finally the scope for extension of
present work is also identified.
List of publications p. xvii, Annexure p. 149-155,
References p. 156-171
Advisors/Committee Members: Rao, Vasudeva V, Sharma, K V.
Subjects/Keywords: Jet Impingement Cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Anwarulla, M. (2011). Experimental and theoretical investigation on the effect
of geometric parameters in electronic component cooling using jet
impingement. (Thesis). Jawaharlal Nehru Technological University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/3483
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):
Anwarulla, Mohammad. “Experimental and theoretical investigation on the effect
of geometric parameters in electronic component cooling using jet
impingement.” 2011. Thesis, Jawaharlal Nehru Technological University. Accessed February 18, 2020.
http://shodhganga.inflibnet.ac.in/handle/10603/3483.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Anwarulla, Mohammad. “Experimental and theoretical investigation on the effect
of geometric parameters in electronic component cooling using jet
impingement.” 2011. Web. 18 Feb 2020.
Vancouver:
Anwarulla M. Experimental and theoretical investigation on the effect
of geometric parameters in electronic component cooling using jet
impingement. [Internet] [Thesis]. Jawaharlal Nehru Technological University; 2011. [cited 2020 Feb 18].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/3483.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Anwarulla M. Experimental and theoretical investigation on the effect
of geometric parameters in electronic component cooling using jet
impingement. [Thesis]. Jawaharlal Nehru Technological University; 2011. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/3483
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
California State University – Sacramento
14.
Verduzco, Manuel L.
Solar thermal energy feasibility in a commercial building in Sacramento.
Degree: MS, Mechanical Engineering, 2014, California State University – Sacramento
URL: http://hdl.handle.net/10211.3/122216
► In recent years, the demand for air conditioning systems due to the demand of higher comfort conditions has led to a significant increase for primary…
(more)
▼ In recent years, the demand for air conditioning systems due to the demand of higher comfort conditions has led to a significant increase for primary energy resources such as solar energy for
cooling. Solar
cooling (SC) is getting more and more readily available and cost effective. SC is environmentally friendly and decreases ???CO???
2 emissions thus reducing the greenhouse effect. Currently, one of the most frequently used solar
cooling systems is the water absorption chillers. Most traditional air conditioning systems use compression technology for their chillers. The absorption chillers used for SC usually combine with flat plate or an evacuated tube collectors. These types of SC are relatively young and are still being developed. In this paper, a two story building that has an area of 2796 square meters and a max
cooling load of about 211 kWh (60 RTh) is analyzed. Case Study 1 uses three of these buildings, Case Study 2 uses six buildings, and Case Study 3 uses 8 buildings. Given the different case studies, different chillers were chosen and the number of evacuated tube collectors and storage tanks are either increased or decreased given the number of buildings. The building???s design and
cooling loads were developed with conjunction with the ASHRAE Example Building for Chapter 30, Nonresidential
Cooling and Heating Load Calculations, of the 2005 ASHRAE Handbook-Fundamentals [1]. For the
cooling and heating load calculations the radiant time series (RTS) method was used. From the
cooling loads, the collector area and the volume of the storage tank were determined. In each of these three case studies, a cost analysis was made to compare the solar absorption system versus the tradition compression chiller. This analysis is made to see if this relatively new type of SC is even feasible in the Sacramento area.
Only in Case Study 1, the solar absorption system (796,663) is more economical than the vapor compression system (901,624) after 20 years. The cost of Case Study 2 is 1,703,456 for the solar absorption system and 1,681,408 for the vapor compression system after 20 years. Finally, for Case Study 3, which included 8 buildings, the solar absorption system cost is 2,240,643 and the cost for vapor compression system is 2,194,774 after 20 years.
Advisors/Committee Members: Marbach, Timothy.
Subjects/Keywords: Solar; Cooling; Absorption
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Verduzco, M. L. (2014). Solar thermal energy feasibility in a commercial building in Sacramento. (Masters Thesis). California State University – Sacramento. Retrieved from http://hdl.handle.net/10211.3/122216
Chicago Manual of Style (16th Edition):
Verduzco, Manuel L. “Solar thermal energy feasibility in a commercial building in Sacramento.” 2014. Masters Thesis, California State University – Sacramento. Accessed February 18, 2020.
http://hdl.handle.net/10211.3/122216.
MLA Handbook (7th Edition):
Verduzco, Manuel L. “Solar thermal energy feasibility in a commercial building in Sacramento.” 2014. Web. 18 Feb 2020.
Vancouver:
Verduzco ML. Solar thermal energy feasibility in a commercial building in Sacramento. [Internet] [Masters thesis]. California State University – Sacramento; 2014. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/10211.3/122216.
Council of Science Editors:
Verduzco ML. Solar thermal energy feasibility in a commercial building in Sacramento. [Masters Thesis]. California State University – Sacramento; 2014. Available from: http://hdl.handle.net/10211.3/122216
Oregon State University
15.
Asumpinpong, Kasidid.
Development of a microchannel device for adsorption cooling application.
Degree: MS, Chemical Engineering, 2009, Oregon State University
URL: http://hdl.handle.net/1957/10672
► Single-layer and three-layer microchannel adsorption devices were fabricated by procedure that was newly developed. Aluminum was chosen for metal housing while the adsorption pair was…
(more)
▼ Single-layer and three-layer microchannel adsorption devices were fabricated by
procedure that was newly developed. Aluminum was chosen for metal housing while
the adsorption pair was silica gel and water. Each adsorption layer contained two
layers of 250 μm-thick silica gel. Both silica gel layers opened to the same layer of
adsorption channels. The layers of air flow channels were placed between two
adsorption layers, including over the top and below the bottom adsorption layers. Each
layer of adsorption channels and air flow channels contained array of six
microchannels. Each microchannel was 400 μm tall, 5.8 mm wide and 4.4 cm long.
The device was bonded by B-staged epoxy thin film at moderate temperature of
120°C. The overall dimensions of the fabricated device were 5 cm x 5 cm x 10.2 mm
for the three-layer device. A maximum coefficient of performance (COP) of 0.506 was
achieved at the evaporator temperature of 22°C, adsorption temperature of 23°C and
desorption temperature of 50°C. The highest specific
cooling power (SCP) obtained
was 601 W/kg silica gel when desorption temperature was increased to 70°C The
overall performance of the device improved slightly when the air flow rate was
increased. The COP increased by a factor of 2.4 when the number of adsorption layers
increased from 1 to 3. The results from simulation model agreed with the experimental
results and also showed that both COP and SCP decreased drastically when evaporator
temperature was far below the adsorption temperature.
Advisors/Committee Members: Rorrer, Gregory L. (advisor), Chang, Chih-hung (committee member).
Subjects/Keywords: Microchannel; Microelectronics – Cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Asumpinpong, K. (2009). Development of a microchannel device for adsorption cooling application. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/10672
Chicago Manual of Style (16th Edition):
Asumpinpong, Kasidid. “Development of a microchannel device for adsorption cooling application.” 2009. Masters Thesis, Oregon State University. Accessed February 18, 2020.
http://hdl.handle.net/1957/10672.
MLA Handbook (7th Edition):
Asumpinpong, Kasidid. “Development of a microchannel device for adsorption cooling application.” 2009. Web. 18 Feb 2020.
Vancouver:
Asumpinpong K. Development of a microchannel device for adsorption cooling application. [Internet] [Masters thesis]. Oregon State University; 2009. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/1957/10672.
Council of Science Editors:
Asumpinpong K. Development of a microchannel device for adsorption cooling application. [Masters Thesis]. Oregon State University; 2009. Available from: http://hdl.handle.net/1957/10672
Georgia Tech
16.
Hesse, Danielle.
Passive thermal management of distribution grid assets.
Degree: MS, Mechanical Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/54329
► This thesis presents a comprehensive study into the passive thermal management of high-voltage power electronics converters for use in augmented grid assets capable of performing…
(more)
▼ This thesis presents a comprehensive study into the passive thermal management of high-voltage power electronics converters for use in augmented grid assets capable of performing power routing on the electricity grid. The work has focused on the thermal transport of single-phase closed thermosiphon systems incorporating a secondary parallel flow path for
cooling an additional, typically smaller, thermal load associated with the power electronics converters. Dual-loop thermosiphon passive thermal management systems were incorporated into a grounded compact dynamic phase angle regulator (GCD-PAR) that aimed to facilitate power routing and reduce line losses on the power grid. The power router utilizes power electronics that reject heat to a planar area, or cold plate, which must be cooled by an entirely passive system to comply with the minimum 30 year mean time between failures (MTBF) consistent with grid reliability requirements. This design includes a secondary-loop
cooling path that utilizes the
cooling oil already present in the transformer to also cool the power router. An analytical multi-physics thermosiphon model is developed that couples existing fluid dynamic and heat transfer correlations to create a description of the steady state operation of a specific cylindrical 50 kVA transformer augmented with a thermosiphon. The model is validated experimentally and found to solve for steady state baseplate temperatures under maximum load within 2°C in 0.1 seconds. The model is then modified for a specific rectilinear 1 MVA transformer augmented with three thermosiphons. The 1 MVA model is validated experimentally and found to solve for steady state baseplate temperatures under maximum load within 4 °C in 0.2 seconds. The analytical model proves to be accurate and solve quickly with various geometric configurations and thermal loads.
Advisors/Committee Members: Mayor, Rhett J. (advisor), Ghiaasiaan, Mostafa S. (committee member), Jeter, Sheldon (committee member).
Subjects/Keywords: Thermosiphon; Passive cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hesse, D. (2015). Passive thermal management of distribution grid assets. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54329
Chicago Manual of Style (16th Edition):
Hesse, Danielle. “Passive thermal management of distribution grid assets.” 2015. Masters Thesis, Georgia Tech. Accessed February 18, 2020.
http://hdl.handle.net/1853/54329.
MLA Handbook (7th Edition):
Hesse, Danielle. “Passive thermal management of distribution grid assets.” 2015. Web. 18 Feb 2020.
Vancouver:
Hesse D. Passive thermal management of distribution grid assets. [Internet] [Masters thesis]. Georgia Tech; 2015. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/1853/54329.
Council of Science Editors:
Hesse D. Passive thermal management of distribution grid assets. [Masters Thesis]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/54329
Anna University
17.
Arulselvan A.
Investigations on water heat pipe under various modes of
condenser cooling;.
Degree: Water heat pipe under various modes of condenser
cooling, 2013, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/11308
► The heat pipe is a device, which does not require any external power to transport heat over a large distance, with minimal temperature difference. The…
(more)
▼ The heat pipe is a device, which does not require
any external power to transport heat over a large distance, with
minimal temperature difference. The simplicity of design, and ease
of manufacture and maintenance of heat pipes have made them
applicable in various fields of industry, such as energy conversion
systems, cooling of nuclear and isotope reactors, cooling of
electronic equipment, and high performance space applications. In
the present work, three heat pipes of the same dimensions of 1 m
length and 0.031m outer diameter were constructed with some
modifications in the condenser section, in order to provide three
different modes of cooling, viz, air cooling, water cooling and
cooling with extended surfaces in the condenser section.
Experiments are conducted to determine the surface and vapor
temperature distribution, at steady and transient conditions for
all the above said three modes of cooling in the condenser section.
A CFD analysis was also carried out, and the results under steady
state conditions are compared with the results obtained from the
experiments and reported. The performance of the heat pipe depends
on the type of cooling, and also the temperature at which the
cooling medium is available. In the cases of fin cooling and water
cooling in the condenser side, it is possible to maintain the
temperature of the vapor and the surface of the evaporator section
close to the saturation temperature, corresponding to the vapor
pressure maintained inside the heat pipe at the start of the
experiment. The effective thermal conductivity has been increased
approximately by 40 % to 45 %. Further, a material saving of 400 %
is achieved due to the hollow configuration made for the flow of
the heat transfer fluid. The CFD results are in reasonable
agreement with the results obtained from the experimental
investigation. The CFD analysis will be useful to extend the
analysis for other geometrical and dynamic parametric conditions.
newline
Appendices 1 and 2; pp. 81-83
Advisors/Committee Members: Velraj, R..
Subjects/Keywords: Water heat pipe; condenser cooling; air cooling; water
cooling; CFD analysis
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
A, A. (2013). Investigations on water heat pipe under various modes of
condenser cooling;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/11308
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):
A, Arulselvan. “Investigations on water heat pipe under various modes of
condenser cooling;.” 2013. Thesis, Anna University. Accessed February 18, 2020.
http://shodhganga.inflibnet.ac.in/handle/10603/11308.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
A, Arulselvan. “Investigations on water heat pipe under various modes of
condenser cooling;.” 2013. Web. 18 Feb 2020.
Vancouver:
A A. Investigations on water heat pipe under various modes of
condenser cooling;. [Internet] [Thesis]. Anna University; 2013. [cited 2020 Feb 18].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/11308.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
A A. Investigations on water heat pipe under various modes of
condenser cooling;. [Thesis]. Anna University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/11308
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Louisiana State University
18.
Drewes, Christopher Michael.
The Design, Fabrication, and Validation of a Film Cooled Rotating Turbine Cascade with an Actively Cooled Shroud in a Closed Loop Wind Tunnel.
Degree: MSME, Mechanical Engineering, 2016, Louisiana State University
URL: etd-04072016-074848
;
https://digitalcommons.lsu.edu/gradschool_theses/2030
► To test shroud and blade cooling effectiveness, a closed loop, heated wind tunnel housing a film cooled rotating turbine cascade with prescribed blade and vane…
(more)
▼ To test shroud and blade cooling effectiveness, a closed loop, heated wind tunnel housing a film cooled rotating turbine cascade with prescribed blade and vane geometry surrounded by a fully cooled shroud with a leading edge gap were designed and assembled on Louisiana State University’s campus. Heat transfer coefficients and film cooling effectiveness results were computed using a 1-D semi-infinite solid conduction analysis of material temperatures obtained with liquid crystal thermography. Proper analysis required a step change in air temperature; so a bypass loop provided mainstream air heating while maintaining the shroud and blades at ambient temperature. Also, analysis required hollow tip film cooled turbine blades constructed of low thermal conductivity material, resulting in fabrication by 3-D plastic printing. An analytical stress model and finite element analysis validated plastic blade structural base design. Static-structural and dynamic fatigue loading analyses determined rotor shaft size. Heat transfer and pressure loss calculations verified the system’s required blade and shroud cooling characteristics. Finally, velocity vector measurements at the nozzle guide vane leading edge and recorded pressures in a nozzle guide vane passageway upstream of the turbine cascade location validated incoming freestream flow properties for the design condition at which heat transfer measurements were recorded. A total pressure loss analysis for varying rotor speed and blowing ratio was conducted with the development of total pressure contours downstream of the exit guide vanes to understand losses in the nozzle-rotor passage. Loss structures were found at the tip and root of the exit guide vane, attributed to the shed vortex and tip leakage vortex developed from the rotor blade. Total pressure loss decreased as blowing ratio increased due to energy added to the mainstream flow through the film cooling air. Rotor speed was varied from 55 to 655 RPM. Total pressure losses were lowest at 55 RPM, increased with increasing rotor speed past the 355 RPM design speed, and decreased as rotor speed approached 655 RPM. These results could be attributed to the introduction or extraction of shaft work in the rotating system along with aerodynamic losses associated with changes from the incidence angle design.
Subjects/Keywords: shroud cooling; tip cooling; heat transfer; gas turbine; film cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Drewes, C. M. (2016). The Design, Fabrication, and Validation of a Film Cooled Rotating Turbine Cascade with an Actively Cooled Shroud in a Closed Loop Wind Tunnel. (Masters Thesis). Louisiana State University. Retrieved from etd-04072016-074848 ; https://digitalcommons.lsu.edu/gradschool_theses/2030
Chicago Manual of Style (16th Edition):
Drewes, Christopher Michael. “The Design, Fabrication, and Validation of a Film Cooled Rotating Turbine Cascade with an Actively Cooled Shroud in a Closed Loop Wind Tunnel.” 2016. Masters Thesis, Louisiana State University. Accessed February 18, 2020.
etd-04072016-074848 ; https://digitalcommons.lsu.edu/gradschool_theses/2030.
MLA Handbook (7th Edition):
Drewes, Christopher Michael. “The Design, Fabrication, and Validation of a Film Cooled Rotating Turbine Cascade with an Actively Cooled Shroud in a Closed Loop Wind Tunnel.” 2016. Web. 18 Feb 2020.
Vancouver:
Drewes CM. The Design, Fabrication, and Validation of a Film Cooled Rotating Turbine Cascade with an Actively Cooled Shroud in a Closed Loop Wind Tunnel. [Internet] [Masters thesis]. Louisiana State University; 2016. [cited 2020 Feb 18].
Available from: etd-04072016-074848 ; https://digitalcommons.lsu.edu/gradschool_theses/2030.
Council of Science Editors:
Drewes CM. The Design, Fabrication, and Validation of a Film Cooled Rotating Turbine Cascade with an Actively Cooled Shroud in a Closed Loop Wind Tunnel. [Masters Thesis]. Louisiana State University; 2016. Available from: etd-04072016-074848 ; https://digitalcommons.lsu.edu/gradschool_theses/2030
Virginia Tech
19.
Lamont, Justin Andrew.
Heat Transfer in Stationary and Rotating Coolant Channels Using a Transient Liquid Crystal Technique.
Degree: PhD, Mechanical Engineering, 2012, Virginia Tech
URL: http://hdl.handle.net/10919/19192
► Heat transfer inside rotating coolant channels have a significant impact in design of gas turbine airfoils and other rotating components such as generator windings. The…
(more)
▼ Heat transfer inside rotating coolant channels have a significant impact in design of gas turbine airfoils and other rotating components such as generator windings. The effects of the Coriolis acceleration and centrifugal buoyancy have a significant impact on heat transfer behavior inside such rotating coolant channels due to the complex flow patterns of coolant. Detailed heat transfer knowledge greatly enhances the designersábility to validate numerical models of newly designed channels. A rotating experimental rig was designed and built to model scaled up coolant channels at speeds up to 750 rotations per minute (rpm). A camera is mounted onto the rotating test section and a transient liquid crystal technique is used to measure detailed heat transfer coefficients on a surface of interest. The experimental set-up is innovative, as it involves no surface heating of the test section, very little instrumentation beyond a few thermocouples and a spray coating of thermochromic liquid crystals on the test surface. To validate the test rig and the experimental method, multipass coolant channels with rib turbulators, large diameter radially outward channels with rib turbulators, and jet impingement
cooling schemes are studied during rotation. 90deg, W, and M-shaped rib enhancements are studied and detailed heat transfer measurements clearly capture the heat transfer enhancement mechanisms with and without rotation. Jet impingement schemes with single and double rows, normal and off-angle jets, and a cross flow outlet condition are all studied under rotation. Non-rotating studies are also performed for baseline comparisons to rotating conditions. Large aspect ratio, diverging channels with dimple and rib turbulators are studied in a stationary condition. Results for all different test geometries show good comparisons with published studies indicating that the rotating rig and experimental method are valid. Jet impingement schemes produce higher heat transfer compared to the two-pass channels with ribs, however pressure losses are significantly higher. The fewer the jets and H/d=1 produces the highest pressure losses with no significant gain in heat transfer. Off angle jets at H/d=1 produces very high pressure losses with no heat transfer advantage. A final study with radially outward coolant channels is performed with the highest rotation speeds. The structure, test section, and camera are thoroughly designed to withstand the exceptional g-forces. Heat transfer in the radial channels with and without rotation show very little effect of rotation due to the small rotation number.
Advisors/Committee Members: Ekkad, Srinath V. (committeechair), Tafti, Danesh K. (committee member), Roy, Christopher John (committee member), Ng, Wing Fai (committee member), Stern, Curtis H. (committee member).
Subjects/Keywords: Heat Transfer; Gas Turbine Cooling; Stator Winding Cooling; Rotor Winding Cooling; Liquid Crystal Thermography
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lamont, J. A. (2012). Heat Transfer in Stationary and Rotating Coolant Channels Using a Transient Liquid Crystal Technique. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/19192
Chicago Manual of Style (16th Edition):
Lamont, Justin Andrew. “Heat Transfer in Stationary and Rotating Coolant Channels Using a Transient Liquid Crystal Technique.” 2012. Doctoral Dissertation, Virginia Tech. Accessed February 18, 2020.
http://hdl.handle.net/10919/19192.
MLA Handbook (7th Edition):
Lamont, Justin Andrew. “Heat Transfer in Stationary and Rotating Coolant Channels Using a Transient Liquid Crystal Technique.” 2012. Web. 18 Feb 2020.
Vancouver:
Lamont JA. Heat Transfer in Stationary and Rotating Coolant Channels Using a Transient Liquid Crystal Technique. [Internet] [Doctoral dissertation]. Virginia Tech; 2012. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/10919/19192.
Council of Science Editors:
Lamont JA. Heat Transfer in Stationary and Rotating Coolant Channels Using a Transient Liquid Crystal Technique. [Doctoral Dissertation]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/19192
University of Kansas
20.
Underwood, Sean Christopher.
Aerothermodynamics of Impingement and Film Cooling in a Gas Turbine Blade.
Degree: PhD, Aerospace Engineering, 2018, University of Kansas
URL: http://hdl.handle.net/1808/27605
► The service life of gas turbine engine turbine blades depends on the blade’s material, service temperature and total stress. In high-performance gas turbines, film cooling…
(more)
▼ The service life of gas turbine engine turbine blades depends on the blade’s material, service temperature and total stress. In high-performance gas turbines, film
cooling is widely used to reduce the blade service temperature. Often impingement
cooling is also employed to target the stagnation point heat transfer for internally-cooled gas turbine blades. A novel thermal wind tunnel was designed to study the combined effect of the impingement and film
cooling on blunt airfoils. The hot exhaust plume of a micro-jet is used as the source of high-temperature gas flow in the thermal wind tunnel. An ejector nozzle was designed and integrated with the hot jet to provide a thermally controlled test section environment in the research facility. Measurements of freestream parameters such as gas speed, turbulence intensity and gas temperature were made. An airfoil that utilizes leading-edge (internal) impingement as well as film
cooling holes on its suction surface was designed and fabricated. A
cooling sleeve is used inside the airfoil to guide the impingement jets on the leading edge and to supply the coolant to the film holes. The surface temperature distribution is measured by an array of eight thermocouples flush-mounted on the airfoil surface downstream of the film holes. The initial ranges of blowing parameters (Mb) investigated were between 5 and 6. Numerical simulation using a commercially available Reynolds-Averaged Navier-Stokes (RANS) software was used and validated by the experimental measurements. The numerical simulations for the airfoil consisted of two thermal wall boundary conditions, the adiabatic and conjugate heat transfer (CHT) models. The adiabatic model focuses on the effect of film
cooling on an adiabatic wall. The conjugate heat transfer model represents the solid and fluid heat transfer exchange, conduction and convection. Verification and validation was completed to ensure accurate aerothermodynamic simulations. The experimental and numerical data showed a close comparison for the suction surface temperatures and
cooling effectiveness. A broader range of characteristic parameters (blowing parameter, turbulence intensity (Tu) and density ratio) were studied to show their impact on film
cooling effectiveness parameter. The effects from the blowing parameter are reported for different Mb of 0.53 to 5.95 with two turbulent intensities, 5% and 20%. The adiabatic film effectiveness parameter showed two unique trends: low Mb with low Tu or high Mb with high Tu both exhibited improved film
cooling effectiveness. Jet detachment is also detected at Mb ~ 1.5 for the current film
cooling set up. The study of turbulence intensity effects was completed in the range of 5% to 25 % for two density ratios of 1.65 and 1.99. The turbulence intensity study showed that higher Tu caused the adiabatic film effectiveness to decrease by an average 18%. The density ratio (DR) in the film
cooling is studied to explore the real turbine environment. The velocity ratio and turbulence intensity is held at a constant of 0.64 and…
Advisors/Committee Members: Taghavi, Ray (advisor), Farokhi, Saeed (advisor), Wu, Huixuan (cmtemember), Keshmiri, Shawn (cmtemember), Medina, Mario (cmtemember).
Subjects/Keywords: Aerospace engineering; Mechanical engineering; Aerothermodynamics; Film Cooling; Gas Turbine; Impingement Cooling; Propulsion; Turbine Blade Cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Underwood, S. C. (2018). Aerothermodynamics of Impingement and Film Cooling in a Gas Turbine Blade. (Doctoral Dissertation). University of Kansas. Retrieved from http://hdl.handle.net/1808/27605
Chicago Manual of Style (16th Edition):
Underwood, Sean Christopher. “Aerothermodynamics of Impingement and Film Cooling in a Gas Turbine Blade.” 2018. Doctoral Dissertation, University of Kansas. Accessed February 18, 2020.
http://hdl.handle.net/1808/27605.
MLA Handbook (7th Edition):
Underwood, Sean Christopher. “Aerothermodynamics of Impingement and Film Cooling in a Gas Turbine Blade.” 2018. Web. 18 Feb 2020.
Vancouver:
Underwood SC. Aerothermodynamics of Impingement and Film Cooling in a Gas Turbine Blade. [Internet] [Doctoral dissertation]. University of Kansas; 2018. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/1808/27605.
Council of Science Editors:
Underwood SC. Aerothermodynamics of Impingement and Film Cooling in a Gas Turbine Blade. [Doctoral Dissertation]. University of Kansas; 2018. Available from: http://hdl.handle.net/1808/27605
Cranfield University
21.
Chen, Jing Ping.
Thermo-mechanical behaviour of heavy-duty disc brake systems.
Degree: PhD, 2001, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/10701
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391557
► In heavy-duty disc brake systems, braking is a transient, non-linear and asymmetrical thermo-mechanical process. Surface cracking, rather than wear, is the major factor limiting the…
(more)
▼ In heavy-duty disc brake systems, braking is a transient, non-linear and asymmetrical thermo-mechanical process. Surface cracking, rather than wear, is the major factor limiting the brake disc's life. The disc material (cast-iron), heat transfer boundary conditions and pad-disc frictional reactions are characteristically non-linear and asymmetrical during the friction process. Non-uniform deformation and surface cracks in brake discs result from the accumulation of excessive residual stress/strain. During braking processes, many factors affect the distributions of the residual stress and strain in discs, and hence the propagation of the surface cracks. The disc material, structure and boundary conditions are three of the crucial aspects. From the structure, a brake disc could be either solid or ventilated. In practice, solid structures always have higher anti-cracking performance than the same class of ventilated designs. However solid discs cost more material and have lower cooling efficiency. This thesis presents an improved finite element analysis for heavy-duty disc brakes and identifies design improvements. As the friction pads slide against the disc's surfaces continuously, the thermal and mechanical loads are functions of time and spatial coordinates. A 3-D asymmetrical finite element model was developed to achieve more accurate simulations of the thermo-mechanical behaviour of brake discs during braking processes. A non-linear inelastic material model for cast-iron was employed in the FE model. Permanent plastic stress and strain fields were predicted and analysed for multi-stop drag operations. The residual stress/strain fields in the discs are investigated to understand the differences between solid and ventilated discs in terms of the cracking resistance ability. Several engineering solutions are recommended for optimising the performance of the disc brake system. _ The thesis is organized in five chapters. Chapter One introduces the background concepts about the commercial disc brake system. In this part, the brake structure, material and previous researches are reviewed. The goals for this investigation are also summarised at the end of this chapter. Chapter Two introduces the general finite element modelling knowledge, procedures and the modelling boundary conditions and material models. Chapter Three presents an analysis of the disc brakes thermo-mechanical behaviour and the affecting factors. Chapter Four is focused on the residual stress field prediction and cracking behaviour analysis. The project conclusions and further research recommendations are presented in Chapter Five.
Subjects/Keywords: 621.8; Cooling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, J. P. (2001). Thermo-mechanical behaviour of heavy-duty disc brake systems. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/10701 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391557
Chicago Manual of Style (16th Edition):
Chen, Jing Ping. “Thermo-mechanical behaviour of heavy-duty disc brake systems.” 2001. Doctoral Dissertation, Cranfield University. Accessed February 18, 2020.
http://dspace.lib.cranfield.ac.uk/handle/1826/10701 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391557.
MLA Handbook (7th Edition):
Chen, Jing Ping. “Thermo-mechanical behaviour of heavy-duty disc brake systems.” 2001. Web. 18 Feb 2020.
Vancouver:
Chen JP. Thermo-mechanical behaviour of heavy-duty disc brake systems. [Internet] [Doctoral dissertation]. Cranfield University; 2001. [cited 2020 Feb 18].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/10701 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391557.
Council of Science Editors:
Chen JP. Thermo-mechanical behaviour of heavy-duty disc brake systems. [Doctoral Dissertation]. Cranfield University; 2001. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/10701 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391557
22.
Mohamad Redzuan, Nurul Adila.
Synthesis of molten salt as heat transfer fluid for waste heat recovery application.
Degree: Faculty of Mechanical and Manufacturing Engineering, 2015, UniversitiTun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/7822/
► Basically, various materials such as water, oil heat, ionic liquids and also molten salt are selected to serve as heat transfer fluid. The properties of…
(more)
▼ Basically, various materials such as water, oil heat, ionic liquids and also molten salt are selected to serve as heat transfer fluid. The properties of the different heat transfer fluid determine their performance in any application. The development of nitrate molten salt with different constituent salt are studied to characterize the physical and thermal properties based on low melting point and high thermal stability in order to be considered as heat transfer fluid in waste heat recovery applications. The nitrate based molten salt that has been use in this study consists of binary, ternary and quaternary salt mixture with different weight composition. Molten salt mixture has been dried in the furnace for 12 hours before mixing. After mixing, the salt mixture was heated in furnace at 150 ºC for 4 hours and increased the temperature to 400 ºC for 8 hours for homogenize the salt mixture. The temperature was reduced to 115 ºC for 1 hour before removed from furnace. Thermal analyses were performed using differential thermal analysis (DTA), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). These analyses were conducted to obtain the melting point, thermal stability and heat capacity of molten salt and fulfill the targeted characteristic of a heat transfer fluid. The result shows the melting point for ternary and quaternary mixtures are closely 100 ºC where the value is 92.4 ºC and 98.9 ºC compared than binary mixtures. Thermal stability analyzed in this study shows that the value for all mixture above 500 ºC but quaternary mixture showed the highest thermal stability which the value is 701 ºC. For heat capacity value of all mixture shows a range between 2.5 – 4.7 J/g ºC and quaternary mixture showed the highest value of heat capacity when compared to all mixture with value of 4.7 J/g ºC. For the conclusion, the quaternary salt mixture has fulfilled the targeted characteristic as heat transfer fluid with low melting point, high thermal stability and heat capacity.
Subjects/Keywords: TP363 Heating; drying; cooling; evaporating
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mohamad Redzuan, N. A. (2015). Synthesis of molten salt as heat transfer fluid for waste heat recovery application. (Masters Thesis). UniversitiTun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/7822/
Chicago Manual of Style (16th Edition):
Mohamad Redzuan, Nurul Adila. “Synthesis of molten salt as heat transfer fluid for waste heat recovery application.” 2015. Masters Thesis, UniversitiTun Hussein Onn Malaysia. Accessed February 18, 2020.
http://eprints.uthm.edu.my/7822/.
MLA Handbook (7th Edition):
Mohamad Redzuan, Nurul Adila. “Synthesis of molten salt as heat transfer fluid for waste heat recovery application.” 2015. Web. 18 Feb 2020.
Vancouver:
Mohamad Redzuan NA. Synthesis of molten salt as heat transfer fluid for waste heat recovery application. [Internet] [Masters thesis]. UniversitiTun Hussein Onn Malaysia; 2015. [cited 2020 Feb 18].
Available from: http://eprints.uthm.edu.my/7822/.
Council of Science Editors:
Mohamad Redzuan NA. Synthesis of molten salt as heat transfer fluid for waste heat recovery application. [Masters Thesis]. UniversitiTun Hussein Onn Malaysia; 2015. Available from: http://eprints.uthm.edu.my/7822/
University of Windsor
23.
Arianmehr, Iman.
Turbulence convective heat transfer for cooling the
photovoltaic cells.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2014, University of Windsor
URL: http://scholar.uwindsor.ca/etd/5149
► Solar PV (photovoltaic) is a rapidly advancing renewable energy technology which converts sunlight directly into electricity. One of the outstanding challenges of the current…
(more)
▼ Solar PV (photovoltaic) is a rapidly
advancing renewable energy technology which converts sunlight
directly into electricity. One of the outstanding challenges of the
current PV technology is the reduction in its conversion efficiency
with increasing PV panel temperature, which is closely associated
with the increase in solar intensity and the ambient temperature
surrounding the PV panels. To more effectively capture the
available energy when the sun is most intense, significant efforts
have been invested in active and passive
cooling research over the
last few years. While integrated
cooling systems can lead to the
highest total efficiencies, they are usually neither the most
feasible nor the most cost effective solutions. This work examines
some simple passive means of manipulating the prevailing wind
turbulence to enhance convective heat transfer over a heated plate
in a wind tunnel.
Advisors/Committee Members: Ting, David S-K..
Subjects/Keywords: Applied sciences; Cooling; Photovoltaic; Turbulence
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Arianmehr, I. (2014). Turbulence convective heat transfer for cooling the
photovoltaic cells. (Masters Thesis). University of Windsor. Retrieved from http://scholar.uwindsor.ca/etd/5149
Chicago Manual of Style (16th Edition):
Arianmehr, Iman. “Turbulence convective heat transfer for cooling the
photovoltaic cells.” 2014. Masters Thesis, University of Windsor. Accessed February 18, 2020.
http://scholar.uwindsor.ca/etd/5149.
MLA Handbook (7th Edition):
Arianmehr, Iman. “Turbulence convective heat transfer for cooling the
photovoltaic cells.” 2014. Web. 18 Feb 2020.
Vancouver:
Arianmehr I. Turbulence convective heat transfer for cooling the
photovoltaic cells. [Internet] [Masters thesis]. University of Windsor; 2014. [cited 2020 Feb 18].
Available from: http://scholar.uwindsor.ca/etd/5149.
Council of Science Editors:
Arianmehr I. Turbulence convective heat transfer for cooling the
photovoltaic cells. [Masters Thesis]. University of Windsor; 2014. Available from: http://scholar.uwindsor.ca/etd/5149
Texas A&M University
24.
Mao, Chunliu.
Analysis of Building Peak Cooling Load Calculation Methods for Commercial Buildings in the United States.
Degree: 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/156955
► This study aims to provide valid comparisons of the peak cooling load methods that were published in the ASHRAE Handbook of Fundamentals, including the Heat…
(more)
▼ This study aims to provide valid comparisons of the peak
cooling load methods that were published in the ASHRAE Handbook of Fundamentals, including the Heat Balance Method (HBM), the Radiant Time Series Method (RTSM), the Transfer Function Method (TFM), the Total Equivalent Temperature Difference/ Time Averaging Method (TETD/TA), and the
Cooling Load Temperature Difference/Solar
Cooling Load /
Cooling Load Factor Method (CLTD/SCL/CLF), and propose a new procedure that could be adopted to update the SCL tables in the CLTD/SCL/CLF Method to make the results more accurate.
To accomplish the peak
cooling load method comparisons, three steps were taken.
First, survey and phone interviews were performed on selected field professionals after an IRB approval was obtained. The results showed that the CLTD/SCL/CLF Method was the most popular method used by the HVAC design engineers in the field due to the reduced complexity of applying the method while still providing an acceptable
cooling load prediction accuracy, compared to the other methods.
Next, a base-case comparison analysis was performed using the published data provided with the ASHRAE RP-1117 report. The current study successfully reproduced the HBM results in the RP-1117 report. However, the RTSM
cooling load calculation showed an over-prediction compared to the RTSM results in the report. In addition, analyses of the TFM, the TETD/TA Method and the CLTD/SCL/CLF Method were compared to the base-case
cooling load. The comparisons showed the HBM provided the most accurate analysis compared to the measured data from the RP-1117 research project, and the RTSM performed the best among the simplified methods. The TFM estimated a value very close to the peak
cooling load value compared to the RTSM. The CLTD/SCL/CLF Method behaved the worst among all methods.
Finally, additional case studies were analyzed to further study the impact of fenestration area and glazing type on the peak
cooling load. In these additional comparisons, the HBM was regarded as the baseline for comparison task. Beside the base case, fifteen additional cases were analyzed by assigning different window areas and glazing types. The results of the additional tests showed the RTSM performed well followed by the TFM. The TETD/TA Method behaved somewhere in between the TFM and CLTD/SCL/CLF Method. In a similar fashion as the base-case comparisons, the CLTD/SCL/CLF Method performed the worst among all methods.
Based in part on the results of the survey and interview as well as the comparisons, updates to the SCL tables in the CLTD/SCL/CLF Method were developed that allowed the CLTD/SCL/CLF Method to be more accurate when compared to the HBM. The new updated SCL tables were calculated based on the SHGC fenestration heat gain model instead of the SC and DSA glass coefficients. Three examples were provided that showed the improved analysis with the updated SCL tables. All of the results showed an improved peak
cooling load estimation.
Advisors/Committee Members: Haberl, Jeff S (advisor), Baltazar-Cervantes, Juan-Carlos (advisor), Beltran, Liliana (committee member), Claridge, David (committee member).
Subjects/Keywords: peak cooling load; commercial buildings
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mao, C. (2016). Analysis of Building Peak Cooling Load Calculation Methods for Commercial Buildings in the United States. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156955
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):
Mao, Chunliu. “Analysis of Building Peak Cooling Load Calculation Methods for Commercial Buildings in the United States.” 2016. Thesis, Texas A&M University. Accessed February 18, 2020.
http://hdl.handle.net/1969.1/156955.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mao, Chunliu. “Analysis of Building Peak Cooling Load Calculation Methods for Commercial Buildings in the United States.” 2016. Web. 18 Feb 2020.
Vancouver:
Mao C. Analysis of Building Peak Cooling Load Calculation Methods for Commercial Buildings in the United States. [Internet] [Thesis]. Texas A&M University; 2016. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/1969.1/156955.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mao C. Analysis of Building Peak Cooling Load Calculation Methods for Commercial Buildings in the United States. [Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/156955
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
25.
Al-Asad, Dawood Khaled Abdullah.
The design and evaluation of a water delivery system for evaporative cooling of a proton exchange membrane fuel cell.
Degree: 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1814
► An investigation was performed to demonstrate system design for the delivery of water required for evaporative cooling of a proton exchange membrane fuel cell (PEMFC).…
(more)
▼ An investigation was performed to demonstrate system design for the delivery of
water required for evaporative
cooling of a proton exchange membrane fuel cell
(PEMFC). The water delivery system uses spray nozzles capable of injecting water
directly and uniformly to the nickel metal foam flow-field (element for distributing the
reactant gases over the surface of the electrodes) on the anode side from which water can
migrate to the cathode side of the cell via electroosmotic drag. For an effective overall
cooling, water distribution over the surface of the nickel foam has to be uniform to avoid
creation of hotspots within the cell. A prototype PEMFC structure was constructed
modeled after a 35 kW electrical output PEMFC stack. Water was sprayed on the nickel
metal foam flow-field using two types of nozzle spray, giving conical fog type flow and
flat fan type flow. A detailed investigation of the distribution pattern of water over the
surface of the nickel metal flow field was conducted. The motive behind the
investigation was to determine if design parameters such as type of water flow from
nozzles, vertical location of the water nozzles above the flowfield, area of the nozzles, or
operating variables such as reactant gas flow had any effect on water distribution over
the surface of the Ni-metal foam flow field. It was found that the design parameters
(types of flow, area and location of the nozzle) had a direct impact on the distribution of
water in the nickel metal foam. However, the operating variable, reactant gas flow,
showed no effect on the water distribution pattern in the Ni-foam.
Advisors/Committee Members: Appleby, A. J (advisor), Lalk, Thomas R (advisor), Kohutek, Terry L (committee member), Suh, Chii-Der S (committee member).
Subjects/Keywords: Fuel cell; Evaporative cooling; PEMFC
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Al-Asad, D. K. A. (2009). The design and evaluation of a water delivery system for evaporative cooling of a proton exchange membrane fuel cell. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1814
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):
Al-Asad, Dawood Khaled Abdullah. “The design and evaluation of a water delivery system for evaporative cooling of a proton exchange membrane fuel cell.” 2009. Thesis, Texas A&M University. Accessed February 18, 2020.
http://hdl.handle.net/1969.1/ETD-TAMU-1814.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Al-Asad, Dawood Khaled Abdullah. “The design and evaluation of a water delivery system for evaporative cooling of a proton exchange membrane fuel cell.” 2009. Web. 18 Feb 2020.
Vancouver:
Al-Asad DKA. The design and evaluation of a water delivery system for evaporative cooling of a proton exchange membrane fuel cell. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1814.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Al-Asad DKA. The design and evaluation of a water delivery system for evaporative cooling of a proton exchange membrane fuel cell. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1814
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
26.
Liu, Kuo-Chun.
Blowing Ratio Effects on Film Cooling Effectiveness.
Degree: 2010, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-2927
► The research focuses on testing the film cooling effectiveness on a gas turbine blade suction side surface. The test is performed on a five bladed…
(more)
▼ The research focuses on testing the film
cooling effectiveness on a gas turbine
blade suction side surface. The test is performed on a five bladed cascade with a
blow down facility. Four different blowing ratios are used in this study, which are
0.5, 1.0, 1.6, and 2.0; mainstream flow conditions are maintained at exit Mach
number of 0.7, 1.1 and 1.3. Nitrogen is injected as the coolant so that the oxygen
concentration levels can be obtained for the test surface. Based on mass transfer
analogy, film
cooling effectiveness can be computed with pressure sensitive paint
(PSP) technique. The effect of blowing ratio on film
cooling effectiveness is
presented for each testing condition. The spanwise averaged effectiveness for
each case is also presented to compare the blowing ratio and mainstream effect on
film
cooling effectiveness. Results show that due to effects of shock, the optimum
blowing ratio is 1.6 for exit Mach number of 1.1 and 1.3; however; without the
effects of shock, the optimum blowing ratio is 1.0 for exit Mach number of 0.7.
Advisors/Committee Members: Han, Je-Chin (advisor), Wen, Sy-Bor (committee member), Chen, Hamn-Ching (committee member).
Subjects/Keywords: film cooling; blowing ratio
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liu, K. (2010). Blowing Ratio Effects on Film Cooling Effectiveness. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-2927
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):
Liu, Kuo-Chun. “Blowing Ratio Effects on Film Cooling Effectiveness.” 2010. Thesis, Texas A&M University. Accessed February 18, 2020.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-2927.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Liu, Kuo-Chun. “Blowing Ratio Effects on Film Cooling Effectiveness.” 2010. Web. 18 Feb 2020.
Vancouver:
Liu K. Blowing Ratio Effects on Film Cooling Effectiveness. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-2927.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Liu K. Blowing Ratio Effects on Film Cooling Effectiveness. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-2927
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
27.
Herbig, Scott M.
Solubilities of various salts in cooling tower water and a correlation to determine their scaling threshold.
Degree: MS, Chemical Engineering, 1985, Oregon State University
URL: http://hdl.handle.net/1957/41138
Subjects/Keywords: Cooling towers
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Herbig, S. M. (1985). Solubilities of various salts in cooling tower water and a correlation to determine their scaling threshold. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/41138
Chicago Manual of Style (16th Edition):
Herbig, Scott M. “Solubilities of various salts in cooling tower water and a correlation to determine their scaling threshold.” 1985. Masters Thesis, Oregon State University. Accessed February 18, 2020.
http://hdl.handle.net/1957/41138.
MLA Handbook (7th Edition):
Herbig, Scott M. “Solubilities of various salts in cooling tower water and a correlation to determine their scaling threshold.” 1985. Web. 18 Feb 2020.
Vancouver:
Herbig SM. Solubilities of various salts in cooling tower water and a correlation to determine their scaling threshold. [Internet] [Masters thesis]. Oregon State University; 1985. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/1957/41138.
Council of Science Editors:
Herbig SM. Solubilities of various salts in cooling tower water and a correlation to determine their scaling threshold. [Masters Thesis]. Oregon State University; 1985. Available from: http://hdl.handle.net/1957/41138
Oregon State University
28.
Barton, Kathleen Patricia.
Calcium carbonate scaling in a deluged dry cooling system.
Degree: MS, Chemical Engineering, 1982, Oregon State University
URL: http://hdl.handle.net/1957/41640
► Scaling characteristics of calcium carbonate on a heated surface in a deluged dry cooling system were investigated. Bulk temperature of the deluge water was maintained…
(more)
▼ Scaling characteristics of calcium carbonate on a heated surface
in a deluged dry
cooling system were investigated. Bulk temperature
of the deluge water was maintained constant at 90°F. Air flow velocity was maintained constant at 181 cfm., and deluge water flow was
maintained at the minimum level that provided thorough wetting on the
heat transfer surface. The heat flow ranged from 540 Btu/hr-ft² to 1616 Btu/hr-ft². The wall temperatures ranged from 90°F with the
deluge water on, to 120°F to 240°F with the deluge water off. Deluge
water was supplied as city water fortified with dissolved calcium
carbonate. The calcium hardness ranged from 144 ppm CaC0₃ to 177
ppm CaC0₃, and the pH ranged from 7.5 to 8.7. The deluge time
ranged from 20 sec. to 8 min., and the drying time between deluges
was maintained constant at 10 min.
The amount of scale deposited on the horizontal cylindrical
surface was a function of the radial position, with the greatest
amount of fouling occurring at the bottom. The rate of growth of
scale was a function of water chemistry, pH, number of deluge
cycles, and duration of deluge cycle. The fouling resistances after 1500 cycles ranged from 0.2 x 10⁻⁴ hr-ft²-°F/Btu for Langelier Saturation Index (LSI) of -1.2 to 1.3 x 10⁻⁴ hr-ft²-°F/Btu for LSI
of 1.0. The net deposition was dependent on both sensible and
evaporative heat transfer effects. The deposition rate was constant for the first 1500 cycles, and it declined after that. The
amount of data was insufficient to allow determination of the cause
for the decline. It was not determined whether the fouling
resistance had reached an asymptotic value. The heat flux appeared
to have no effect on the fouling rate.
Advisors/Committee Members: Knudsen, James G. (advisor).
Subjects/Keywords: Cooling towers
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Barton, K. P. (1982). Calcium carbonate scaling in a deluged dry cooling system. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/41640
Chicago Manual of Style (16th Edition):
Barton, Kathleen Patricia. “Calcium carbonate scaling in a deluged dry cooling system.” 1982. Masters Thesis, Oregon State University. Accessed February 18, 2020.
http://hdl.handle.net/1957/41640.
MLA Handbook (7th Edition):
Barton, Kathleen Patricia. “Calcium carbonate scaling in a deluged dry cooling system.” 1982. Web. 18 Feb 2020.
Vancouver:
Barton KP. Calcium carbonate scaling in a deluged dry cooling system. [Internet] [Masters thesis]. Oregon State University; 1982. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/1957/41640.
Council of Science Editors:
Barton KP. Calcium carbonate scaling in a deluged dry cooling system. [Masters Thesis]. Oregon State University; 1982. Available from: http://hdl.handle.net/1957/41640
Oregon State University
29.
Lahm, Lawrence.
Effects of water quality and surface temperature on the scaling characteristics of cooling tower water.
Degree: MS, Chemical Engineering, 1982, Oregon State University
URL: http://hdl.handle.net/1957/41747
► The fouling of cooling tower water was investigated as a function of heater surface temperature and water quality. In particular, the effects on fouling of…
(more)
▼ The fouling of
cooling tower water was investigated as
a function of heater surface temperature and water quality.
In particular, the effects on fouling of the addition of
calcium in excess of the amounts required for saturation
were examined.
First, the average bulk water temperature was 97 ± 1
degree F, water velocities ranged from 3 to 8ft/s, heated
surface temperatures varied from 105 to 165 degrees F, and
the average effective calcium hardness ranged from 560 to
780 ppm as CaCO₃.
Additionally, the effects of pH in the range 7 to 9
were observed for water with lower levels of calcium. For
these runs, the average bulk water temperature ranged from
97 to 106 degrees F. Water velocities of 3 and 5 ft/s were
used, and the surface temperatures were in the range 155 to
5 ft/s were used:and the surface temperatures were in
the range 155 to 185 degrees F. The average measured
calcium hardness varied from 290 to 400 ppm as CaCO₃.
Of the runs with excess calcium, only one had
significant fouling, suggesting fouling was suppressed.
From the pH runs it appears that there is a minimum in
the fouling tendency at a pH near 8. For the runs for
which the deposits were not primarily CaCO₃, the surface
temperature effects on the asymptotic fouling resistance
to heat transfer corresponded well with predictions in
the literature. For deposits which were almost pure
calcium carbonate, no temperature dependence of the
fouling factor could be shown. The material deposited
was found to correspond strongly with the Ryznar stability
index, with each material deposited in a unique, limited
range of the index.
Advisors/Committee Members: Knudsen, James G. (advisor).
Subjects/Keywords: Cooling towers
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lahm, L. (1982). Effects of water quality and surface temperature on the scaling characteristics of cooling tower water. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/41747
Chicago Manual of Style (16th Edition):
Lahm, Lawrence. “Effects of water quality and surface temperature on the scaling characteristics of cooling tower water.” 1982. Masters Thesis, Oregon State University. Accessed February 18, 2020.
http://hdl.handle.net/1957/41747.
MLA Handbook (7th Edition):
Lahm, Lawrence. “Effects of water quality and surface temperature on the scaling characteristics of cooling tower water.” 1982. Web. 18 Feb 2020.
Vancouver:
Lahm L. Effects of water quality and surface temperature on the scaling characteristics of cooling tower water. [Internet] [Masters thesis]. Oregon State University; 1982. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/1957/41747.
Council of Science Editors:
Lahm L. Effects of water quality and surface temperature on the scaling characteristics of cooling tower water. [Masters Thesis]. Oregon State University; 1982. Available from: http://hdl.handle.net/1957/41747
Oregon State University
30.
Morse, Robert Weber.
Alkalinity effects on the scaling of simulated cooling tower water.
Degree: MS, IN Chemical Engineering, 1975, Oregon State University
URL: http://hdl.handle.net/1957/43869
Subjects/Keywords: Cooling towers
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Morse, R. W. (1975). Alkalinity effects on the scaling of simulated cooling tower water. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/43869
Chicago Manual of Style (16th Edition):
Morse, Robert Weber. “Alkalinity effects on the scaling of simulated cooling tower water.” 1975. Masters Thesis, Oregon State University. Accessed February 18, 2020.
http://hdl.handle.net/1957/43869.
MLA Handbook (7th Edition):
Morse, Robert Weber. “Alkalinity effects on the scaling of simulated cooling tower water.” 1975. Web. 18 Feb 2020.
Vancouver:
Morse RW. Alkalinity effects on the scaling of simulated cooling tower water. [Internet] [Masters thesis]. Oregon State University; 1975. [cited 2020 Feb 18].
Available from: http://hdl.handle.net/1957/43869.
Council of Science Editors:
Morse RW. Alkalinity effects on the scaling of simulated cooling tower water. [Masters Thesis]. Oregon State University; 1975. Available from: http://hdl.handle.net/1957/43869
◁ [1] [2] [3] [4] [5] … [87] ▶
. 
Open Access Theses and Dissertations