Experimental evaluation of zeotropic refrigerants in a dedicated mechanical subcooling system in a CO2 cycle
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Título
Experimental evaluation of zeotropic refrigerants in a dedicated mechanical subcooling system in a CO2 cycleFecha de publicación
2021-05-21Editor
Elsevier Ltd.ISSN
0140-7007; 1879-2081Cita bibliográfica
Llopis, Rodrigo, et al. "Experimental evaluation of zeotropic refrigerants in a dedicated mechanical subcooling system in a CO2 cycle." International Journal of Refrigeration (2021).Tipo de documento
info:eu-repo/semantics/articleVersión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
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). [-]
Publicado en
International Journal of Refrigeration, Vol.128 (August 2021)Entidad financiadora
Ministerio de Ciencia, Innovación y Universidades (España) | Ministerio de Educación, Cultura y Deporte (España) | Ministero dell'Istruzione, dell'Università e della Ricerca (Italia)
Código del proyecto o subvención
RTI2018-093501-B-C21 | FPU16/00151 | 2017KAAECT
Título del proyecto o subvención
PRIN2017 project «The energy flexibility of enhanced heat pumps for the next generation of sustainable buildings (FLEXHEAT)»
Derechos de acceso
© 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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