Research on Energy Saving of PHEV Air Conditioning System Based on Reducing Air Backflow in Underhood

Haibo Wu, Xingwang Tang, Sichuan Xu and Jiangbin Zhou
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Haibo Wu: School of Automotive Studies, Tongji University, Shanghai 200070, China
Xingwang Tang: School of Automotive Studies, Tongji University, Shanghai 200070, China
Sichuan Xu: School of Automotive Studies, Tongji University, Shanghai 200070, China
Jiangbin Zhou: SAIC Volkswagen Automotive Co., Ltd., Shanghai 201800, China

Energies, 2022, vol. 15, issue 9, 1-15

Abstract: A novel method characterizing the air backflow of the underhood in order to improve the thermal efficiency of the air conditioning system (ACS) and reduce the energy consumption of PHEV is proposed in this paper. In addition, a 1D model for analyzing air backflow occurring in the underhood is established and a CFD method for calculating air backflow rate and distribution is proposed. It is found that the decrease in the air backflow rate of the underhood helps to improve the refrigeration capacity of the ACS, and when the backflow ratio cannot be reduced below 10%, the air backflow should be distributed as evenly as possible at the front end of the condenser. Moreover, in order to eliminate the impact of backflow on the underhood of PHEV, the gap between the radiator and the bracket is sealed and the gap around the air guide is reduced. Compared with the original structure, the backflow rate of the optimized structure is reduced from 32.7% to 9.3% and the cabin temperature can be reduced by 3–5 °C.

Keywords: PHEV; air conditioning system; air backflow; thermal management (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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