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

journal contribution
posted on 2023-05-21, 15:11 authored by Wang, A, Cao, F, Jia, F, Liu, Y, Yin, X, Song, Y, Xiaolin WangXiaolin Wang
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.

History

Publication title

International Journal of Refrigeration

Volume

145

Pagination

388–396

ISSN

0140-7007

Department/School

School of Engineering

Publisher

Elsevier Sci Ltd

Place of publication

The Boulevard, Langford Lane, Kidlington, Oxford, England, Oxon, Ox5 1Gb

Rights statement

© 2022 Elsevier Ltd and IIR. All rights reserved

Repository Status

  • Restricted

Socio-economic Objectives

Energy systems and analysis

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