Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 99, Issue -, Pages 337-350Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2018.11.044
Keywords
Exergy; Heat pump; Optimal working point; Subcooling; Superheat
Categories
Funding
- Universitat Politecnica de Valencia
- Spanish government [SFPI1500X074478XV]
- Spanish 'MINISTERIO DE ECONOMIA Y COMPETITIVIDAD' [ENE2017-83665-C2-1-P]
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The optimum performance of a pure subcritical refrigeration cycle depends significantly on the temperature lift of the heat source and sink. Therefore, the maximization of the system efficiency has to be linked to them. This paper shows an exergy analysis of each heat pump component (condenser, evaporator, expansion valve and compressor) considering that the heat source and sink are not at constant temperature. The performed study shows the components with more possibilities for improvement. Based on this analysis, the optimization of cycle parameters like subcooling and superheat as a function of the external conditions have been done. In addition, this work has demonstrated that the components having a higher influence in the system irreversibility's depends significantly on the temperature lift of the secondary fluids. Finally, the obtained results show potentials improvements of the efficiency up to 23% if the system is able to operate in the optimal subcooling and superheat. (C) 2018 Elsevier Ltd and IIR. All rights reserved.
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