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You searched for subject:(heat recovery ventilators). Showing records 1 – 2 of 2 total matches.

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Mississippi State University

1. Mahajan, Govinda. Development of oscillating heat pipe for waste heat recovery.

Degree: PhD, Mechanical Engineering, 2016, Mississippi State University

The development and implementation of technologies that improves Heating Ventilation & Air Conditioning (HVAC) system efficiency, including unique waste heat recovery methods, are sought while considering financial constraints and benefits. Recent studies have found that through the use of advanced waste heat recovery systems, it is possible to reduce buildings energy consumption by 30%. Oscillating heat pipes (OHP) exists as a serpentine-arranged capillary tube, possesses a desirable aerodynamic form factor, and provides for relatively high heat transfer rates via cyclic evaporation and condensation of an encapsulated working fluid with no internal wicking structure required. In last two decade, it has been extensively investigated for its potential application in thermal management of electronic devices. This dissertation focuses on the application of OHP in waste heat recovery systems. To achieve the goal, first a feasibility study is conducted by experimentally assessing a nine turn copper-made bare tube OHP in a typical HVAC ducting system with adjacent air streams at different temperatures. Second, for a prescribed temperature difference and volumetric flow rate of air, a multi-row finned OHP based Heat Recovery Ventilator (OHP-HRV) is designed and analyzed for the task of pre-conditioning the intake air. Additionally, the energy and cost savings analysis is performed specifically for the designed OHP-HRV system and potential cost benefits are demonstrated for various geographical regions within the United States. Finally, an atypically long finned OHP is experimentally investigated (F-OHP) under above prescribed operating condition. Helical fins are added to capillary size OHP tubes at a rate of 12 fins per inch (12 FPI), thereby increasing the heat transfer area by 433%. The coupled effect of fins and oscillation on the thermal performance of F-OHP is examined. Also, F-OHPs thermal performance is compared with that of bare tube OHP of similar dimension and operating under similar condition. It was determined that OHP can be an effective waste heat recovery device in terms of operational cost, manufacturability, thermal and aerodynamic performance. Moreover, it was also determined that OHP-HRV can significantly reduce energy consumption of a commercial building, especially in the winter operation. Advisors/Committee Members: Heejin Cho (chair), Pedro J. Mago (committee member), Rogelio Luck (committee member), Scott M. Thompson (committee member).

Subjects/Keywords: heat exchangers; heat recovery ventilators; waste heat recovery; pulsating heat pipe; Oscillating heat pipe

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mahajan, G. (2016). Development of oscillating heat pipe for waste heat recovery. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262016-160753/ ;

Chicago Manual of Style (16th Edition):

Mahajan, Govinda. “Development of oscillating heat pipe for waste heat recovery.” 2016. Doctoral Dissertation, Mississippi State University. Accessed October 16, 2019. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262016-160753/ ;.

MLA Handbook (7th Edition):

Mahajan, Govinda. “Development of oscillating heat pipe for waste heat recovery.” 2016. Web. 16 Oct 2019.

Vancouver:

Mahajan G. Development of oscillating heat pipe for waste heat recovery. [Internet] [Doctoral dissertation]. Mississippi State University; 2016. [cited 2019 Oct 16]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262016-160753/ ;.

Council of Science Editors:

Mahajan G. Development of oscillating heat pipe for waste heat recovery. [Doctoral Dissertation]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262016-160753/ ;


University of North Texas

2. Mohiuddin, Mohammed Salman. Membrane-Based Energy Recovery Ventilator Coupled with Thermal Energy Storage Using Phase Change Material for Efficient Building Energy Savings.

Degree: 2018, University of North Texas

This research work is focused on a conceptual combination of membrane-based energy recovery ventilator (ERV) and phase change material (PCM) to provide energy savings in building heating, ventilation & air-conditioning (HVAC) systems. An ERV can recover thermal energy and moisture between the outside fresh air (OFA) entering into the building and the exhaust air (EA) leaving from the building thus reducing the energy consumption of the HVAC system for cooling and heating the spaces inside the building. The membranes were stacked parallel to each other forming adjacent channels in a counter-flow arrangement for OFA and EA streams. Heat and moisture is diffused through the membrane core. Flat-plate encapsulated PCM is arranged in OFA duct upstream/downstream of the ERV thereby allowing for further reduction in temperature by virtue of free cooling. Paraffin-based PCMs with a melting point of 24°C and 31°C is used in two different configurations where the PCM is added either before or after the ERV. Computational fluid dynamics (CFD), and heat and mass transfer modeling is employed using COMSOL Multiphysics v5.3 to perform the heat and mass transfer analysis for the membrane-based ERV and flat-plate PCMs. An 8-story office building was considered to perform building energy simulation using eQUEST v3.65 from Department of Energy (DOE). Based on the heat and mass transfer analysis, it is found that the sensible effectiveness (heat recovery) stood in the range of 65%-97% while the latent effectiveness (moisture recovery) stood at 55%-80%. Also, the highest annual energy savings achieved were 72,700 kWh in electricity consumption and 358.45 MBtu in gas consumption. Advisors/Committee Members: Zhao, Weihuan, Li, Xiaohua, Bostanci, Huseyin.

Subjects/Keywords: Membrane Energy Recovery Ventilators; Thermal Energy Storage; Phase Change Materials; CFD, Heat and Mass Transfer; Building Energy Modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mohiuddin, M. S. (2018). Membrane-Based Energy Recovery Ventilator Coupled with Thermal Energy Storage Using Phase Change Material for Efficient Building Energy Savings. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc1404519/

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):

Mohiuddin, Mohammed Salman. “Membrane-Based Energy Recovery Ventilator Coupled with Thermal Energy Storage Using Phase Change Material for Efficient Building Energy Savings.” 2018. Thesis, University of North Texas. Accessed October 16, 2019. https://digital.library.unt.edu/ark:/67531/metadc1404519/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Mohiuddin, Mohammed Salman. “Membrane-Based Energy Recovery Ventilator Coupled with Thermal Energy Storage Using Phase Change Material for Efficient Building Energy Savings.” 2018. Web. 16 Oct 2019.

Vancouver:

Mohiuddin MS. Membrane-Based Energy Recovery Ventilator Coupled with Thermal Energy Storage Using Phase Change Material for Efficient Building Energy Savings. [Internet] [Thesis]. University of North Texas; 2018. [cited 2019 Oct 16]. Available from: https://digital.library.unt.edu/ark:/67531/metadc1404519/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mohiuddin MS. Membrane-Based Energy Recovery Ventilator Coupled with Thermal Energy Storage Using Phase Change Material for Efficient Building Energy Savings. [Thesis]. University of North Texas; 2018. Available from: https://digital.library.unt.edu/ark:/67531/metadc1404519/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.