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Development of the effective defrosting criterion for electric vehicles transcritical CO2 heat pumps under constant heating capacity operation

Citation

Wang, A and Cao, F and Jia, F and Liu, Y and Yin, X and Song, Y and Wang, X, Development of the effective defrosting criterion for electric vehicles transcritical CO2 heat pumps under constant heating capacity operation, International Journal of Refrigeration, 145 pp. 388-396. ISSN 0140-7007 (2023) [Refereed Article]

Copyright Statement

2022 Elsevier Ltd and IIR. All rights reserved

DOI: doi:10.1016/j.ijrefrig.2022.10.023

Abstract

Passenger comfort takes precedence over heating performance for electric vehicle heat pumps. However, frost formation will cause the heat exchange performance to decrease, leading to the heating capacity dissipation. The dynamics of an electric vehicle CO2 heat pump under constant heating capacity operation during the frosting process were revealed. Moreover, it was found that the dynamic characteristics of parameters under constant heating capacity operation were significantly different from those under constant compressor speed operation. The application of defrosting initiation judgment criteria based on traditional heat pumps to electric vehicle heat pumps would lead to some serious false defrosting phenomena and even damage the compressor and pipelines. Therefore, a new defrosting initiation criterion was proposed for electric vehicle heat pumps based on the dynamic characteristics. Then, the reliability of the new initiation was verified by applying it in different heating demand operations. Finally, the average performance of electric vehicle heat pumps adopting the new defrost initiation was compared with the traditional PTC auxiliary heating method. The conclusion demonstrated that the heat pump with the new defrost initiation criterion had obvious performance advantages under different environmental conditions.

Item Details

Item Type:Refereed Article
Keywords:CO2, heat pumps, defrosting initiation criterion, electric vehicles, performance improvement, energy saving
Research Division:Engineering
Research Group:Mechanical engineering
Research Field:Energy generation, conversion and storage (excl. chemical and electrical)
Objective Division:Energy
Objective Group:Energy storage, distribution and supply
Objective Field:Energy systems and analysis
UTAS Author:Wang, X (Professor Xiaolin Wang)
ID Code:154443
Year Published:2023
Deposited By:Engineering
Deposited On:2022-11-30
Last Modified:2023-01-24
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