In this study, the energy and exergy performance of secondary loop systems (2LPs) using HFC-152a and HC-290 was investigated. These 2LPs were compared with a HFC-134a direct expansion system as a baseline system. As compared with the baseline, tested refrigerant charge amount was reduced by 28% for the HFC-152a 2LP and 60% for the HC-290 2LP. Under typical 35°C ambient temperature condition, the coefficient of performance (COP) of the HFC-152a 2LP was increased by 5% for highway driving conditions and 10% for idling conditions. Regarding the HC-290 2LP, the COP was increased by 8% under highway driving conditions and was decreased by 15% under idling conditions. As for the exergy performance, the total exergy destruction was reduced by roughly 9.6% for the HFC-152a 2LP and 14.3% for the HC-290 2LP as compared with HFC-134a baseline during highway driving conditions. A theoretical potential of HC-290 2LP idling performance is that its idling COP would be approximately 15% higher and its exergy destruction would be 12.5% lower than those of the HFC-134a baseline.
Bibliographical noteFunding Information:
The authors gratefully acknowledge the support of this effort from Alternative Cooling Technologies and Applications Consortium at the Center for Environmental Energy Engineering (CEEE) at the University of Maryland, College Park.
Copyright 2017 Elsevier B.V., All rights reserved.
- Exergy destruction
- Mobile air conditioning
- Secondary loop
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- Mechanical Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering