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AuthorSleiti, Ahmad K.
AuthorAl-Ammari, Wahib A.
AuthorAl-Khawaja, Mohammed
Available date2024-02-12T05:54:57Z
Publication Date2021-01-18
Publication NameJournal of Energy Resources Technology, Transactions of the ASME
Identifierhttp://dx.doi.org/10.1115/1.4049368
CitationSleiti, A. K., Al-Ammari, W. A., & Al-Khawaja, M. (2021). Analysis of novel regenerative thermo-mechanical refrigeration system integrated with isobaric engine. Journal of Energy Resources Technology, 143(5), 052103.
ISSN0195-0738
URIhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85102536112&origin=inward
URIhttp://hdl.handle.net/10576/51772
AbstractRefrigerants of the conventional cooling systems contribute to global warming and ozone depletion significantly, therefore it is necessary to develop new cooling systems that use renewable energy resources and waste heat to perform the cooling function with ecofriendly working fluids. To address this, the present study introduces and analyzes a novel regenerative thermo-mechanical refrigeration system that can be powered by renewable heat sources (solar, geothermal, or waste heat). The system consists of a novel expander-compressor unit (ECU) integrated with a vapor-compression refrigeration system. The integrated system operates at the higher-performance supercritical conditions of the working fluids as opposed to the lower-performance subcritical conditions. The performance of the system is evaluated based on several indicators including the power loop efficiency, the coefficient of performance (COP) of the cooling loop, and the expander-compressor diameters. Several working fluids were selected and compared for their suitability based on their performance and environmental effects. It was found that for heat source temperature below 100 °C, adding the regenerator to the system has no benefit. However, the regenerator increases the power efficiency by about 1% for a heat source temperature above 130 °C. This was achieved with a very small size regenerator (Dr=6.5 mm, Lr=142 mm). Results show that there is a tradeoff between high-performance fluids and their environmental effects. Using R32 as a working fluid at heat source temperature Th =150 °C and cold temperature Tc1=40 °C, the system produces a cooling capacity of 1 kW with power efficiency of 10.23%, expander diameter of 53.12 mm, and compressor diameter of 75.4 mm.
SponsorThe work presented in this publication was made possible by NPRP-S (Grant No. 11S-1231-170155) from the Qatar National Research Fund (a member of Qatar Foundation).
Languageen
PublisherAmerican Society of Mechanical Engineers
SubjectAlternative Energy Sources
Energy Conversion/Systems
Energy Systems Analysis
Expander-compressor Unit
Heat Energy Generation/Storage/Transfer
Power (Co-)Generation
Refrigerant Selection
Regenerator
Thermo-Mechanical Refrigeration
Waste Heat
TitleAnalysis of novel regenerative thermo-mechanical refrigeration system integrated with isobaric engine
TypeArticle
Issue Number5
Volume Number143
ESSN1528-8994
dc.accessType Abstract Only


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