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AuthorMukhtar, Hamza K.
AuthorGhani, Saud
Available date2023-12-06T09:34:55Z
Publication Date2021
Publication NameEnergies
ResourceScopus
ISSN19961073
URIhttp://dx.doi.org/10.3390/en14206576
URIhttp://hdl.handle.net/10576/50160
AbstractAbsorption Refrigeration Systems (ARS) are potential alternatives to direct expansion (DX) refrigeration systems. This review focused on the incorporation of an ejector into absorption refrigeration cycles to constitute Hybrid Ejector-Absorption Refrigeration Systems (HEARS). The ejector adds several advantages to the absorption refrigeration systems depending on its location in the cycle. The two prevalent configurations of HEARS are Triple pressure level (TPL-HEARS), and Low Pressure Condenser (LPC-HEARS). Previous studies revealed the preference of the latter configuration as it allows lower circulation ratios, enhances the refrigeration effect, and could achieve a COP up to 1. Moreover, LPC configuration is suitable with single, double, and variable-effect absorption systems with a COP of above unity. In turn, the TPL-HEARS notably enhances the absorption process, particularly when a variable geometry ejector is utilized. This configuration could obtain a COP around 1.1, but only with high-density refrigerant vapor. Lately, to attain the advantages of both configurations, some studies investigated the viability of adding two ejectors to the cycle. This paper meticulously reviews investigations conducted on the emerging dual ejectors-absorption refrigeration technology. This paper reveals the general performance trend and the maximum attainable COP by each type of hybrid ejector-absorption refrigeration system. DEARS and Ejector-driven absorption refrigeration systems (ED-ARS) could achieve COP that ranges between 1.2 and 1.46. The use of a flash tank and a RHE is essential in NH3/H2O HEARS. At high generator temperatures (of 120–170 °C), DEARS was found to be the system with less complexity and best performance. Nevertheless, the performance of the DEARS might drop significantly if the heat source temperature is fluctuating. Thence, the variable-effect HEARS is considered the best alternative. The capability of HEARS to be integrated with different power generation cycles is also highlighted. Finally, the review presents possible future research opportunities to improve the absorption refrigeration technology.
SponsorFunding: The work in this paper was funded by Qatar National Research Fund under its National Priorities Research Program [Award number NPRP11S-0114-180295]. The contents of this work are solely the responsibility of the authors and do not necessarily represent the official views of the Qatar National Research Fund. Open Access funding was provided by the Qatar National Library.
Languageen
PublisherMDPI
SubjectAbsorption refrigeration
Combined ejector absorption system
Cooling system
Dual ejectors
Hybrid refrigeration system
TitleHybrid ejector-absorption refrigeration systems: A review
TypeArticle Review
Issue Number20
Volume Number14
dc.accessType Open Access


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