Energy improvements of CO2 transcritical refrigeration cycles using dedicated mechanical subcooling
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Otros documentos de la autoría: Llopis, Rodrigo; Cabello López, Ramón; Sánchez García-Vacas, Daniel; Torrella, Enrique
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comunitat-uji-handle3:10234/8617
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Título
Energy improvements of CO2 transcritical refrigeration cycles using dedicated mechanical subcoolingFecha de publicación
2015-07xmlui.dri2xhtml.METS-1.0.item-edition
PreprintEditor
ElsevierCita bibliográfica
LLOPIS, Rodrigo, et al. Energy improvements of CO 2 transcritical refrigeration cycles using dedicated mechanical subcooling. International Journal of Refrigeration, 2015, vol. 55, p. 129-141.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.sciencedirect.com/science/article/pii/S0140700715000754Palabras clave / Materias
Resumen
In this work the possibilities of enhancing the energy performance of CO2 transcritical refrigeration systems using a dedicated mechanical subcooling cycle are analysed theoretically. Using simplified models of the ... [+]
In this work the possibilities of enhancing the energy performance of CO2 transcritical refrigeration systems using a dedicated mechanical subcooling cycle are analysed theoretically. Using simplified models of the cycles, the modification of the optimum operating conditions of the CO2 transcritical cycle by the use of the mechanical subcooling are analysed and discussed. Next, for the optimum conditions, the possibilities of improving the energy performance of the transcritical cycle with the mechanical subcooling are evaluated for three evaporating levels (5, −5 and −30 °C) for environment temperatures from 20 to 35 °C using propane as refrigerant for the subcooling cycle. It has been observed that the cycle combination will allow increasing the COP up to a maximum of 20% and the cooling capacity up to a maximum of 28.8%, being both increments higher at high evaporating levels. Furthermore, the results indicate that this cycle is more convenient for environment temperatures above 25 °C. Finally, the results using different refrigerants for the mechanical subcooling cycle are presented, where no important differences are observed. [-]
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International Journal of Refrigeration, 2015, vol. 55Derechos de acceso
info:eu-repo/semantics/openAccess
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