Experimental evaluation of zeotropic refrigerants in a dedicated mechanical subcooling system in a CO2 cycle
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comunitat-uji-handle2:10234/7035
comunitat-uji-handle3:10234/8617
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Title
Experimental evaluation of zeotropic refrigerants in a dedicated mechanical subcooling system in a CO2 cycleDate
2021-05-21Publisher
Elsevier Ltd.ISSN
0140-7007; 1879-2081Bibliographic citation
Llopis, Rodrigo, et al. "Experimental evaluation of zeotropic refrigerants in a dedicated mechanical subcooling system in a CO2 cycle." International Journal of Refrigeration (2021).Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
Use of zeotropic blends in the dedicated mechanical subcooling system of a CO2 refrigeration system was suggested as a possible improvement due to matching of evaporating temperature with CO2 temperature profile during ... [+]
Use of zeotropic blends in the dedicated mechanical subcooling system of a CO2 refrigeration system was suggested as a possible improvement due to matching of evaporating temperature with CO2 temperature profile during subcooling. This work has verified this possibility and has determined theoretically the best performing compositions of R-600, R-32 and CO2 with the base fluid R-152a. Then, the mixtures have been tested experimentally in a lab-test bench for constant heat load temperature for three heat rejection temperatures (25.1, 30.3 and 35.1°C). Optimum conditions are measured (subcooling degree and heat rejection) and a COP increase of 1.4% has been obtained. The work, for the optimum conditions, analyses the operating parameters of the cycles and focus specially on the thermal parameters of the subcooler. It has been verified that the use of zeotropic mixtures allows to reduce irreversibilities in the cycle, as pointed out theoretically by Dai et al. (2018). [-]
Is part of
International Journal of Refrigeration, Vol.128 (August 2021)Funder Name
Ministerio de Ciencia, Innovación y Universidades (España) | Ministerio de Educación, Cultura y Deporte (España) | Ministero dell'Istruzione, dell'Università e della Ricerca (Italia)
Project code
RTI2018-093501-B-C21 | FPU16/00151 | 2017KAAECT
Project title or grant
PRIN2017 project «The energy flexibility of enhanced heat pumps for the next generation of sustainable buildings (FLEXHEAT)»
Rights
© 2021 The Author(s). Published by Elsevier Ltd.
This is an open access article under the CC BY-NC-ND license
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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