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Experimental analysis of defrosting and heating performance of a solar-assisted heat pump integrated phase change energy storage

Chen, Haifei; Li, Guiqiang; Wang, Yunjie; Zhang, Fuwei; Badiei, Ali; Lu, Tao; Yang, Jie; Jiang, Lvlin; Zhang, Yang


Haifei Chen

Guiqiang Li

Yunjie Wang

Fuwei Zhang

Ali Badiei

Tao Lu

Jie Yang

Lvlin Jiang

Yang Zhang


© 2019 John Wiley & Sons Ltd This thesis investigates a novel solar-assisted heat pump integrated phase change energy storage system. The defrosting performance of this system was studied experimentally and the results were compared with two traditionally used methods: reverse cycle defrosting (RCD) method and hot gas bypass defrosting (HGBD) method. The results show that the phase change energy storage system has superior performance compared with traditional defrosting methods. The indoor temperature drop recorded was relatively small and the defrosting time was 75% of the RCD system and 53% of HGBD system. The phase change energy storage system increased the condensation temperature which consequently increased the temperature difference of heat transfer resulting in higher conductivity in the defrosting progress. Compared with the method of RCD and the method of HGBD, the recovery time of the system was shortened by 90 and 160 seconds, respectively. The system works with low-temperature heat source and circulating water, which considerably reduces energy consumption, thereby improving the performance of the defrosting system. A further experimental study was also conducted on the heating performance and the results also indicated that the value of COP can reach up to 3.6 in daytime, and the indoor temperature can be stably maintained above 18°C throughout the day. Novelty Statement: A new defrosting method for energy storage defrosting is proposed, and the defrosting performance is compared with two common defrosting methods. In addition, the performances of the heating system over the day were experimentally investigated. The experimental results show the system meets the heating needs of the building. Finally, the influence of the outdoor temperature on the exergy efficiency of the system was discussed. It shows that this system can improve the operational stability, the system economy and energy saving.


Chen, H., Li, G., Wang, Y., Zhang, F., Badiei, A., Lu, T., …Zhang, Y. (2020). Experimental analysis of defrosting and heating performance of a solar-assisted heat pump integrated phase change energy storage. International journal of energy research, 44(3), 2173-2182.

Journal Article Type Article
Acceptance Date Nov 26, 2019
Online Publication Date Dec 13, 2019
Publication Date Mar 10, 2020
Deposit Date Jan 3, 2020
Publicly Available Date Dec 14, 2020
Journal International Journal of Energy Research
Print ISSN 0363-907X
Electronic ISSN 1099-114X
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 44
Issue 3
Pages 2173-2182
Keywords Defrosting performance; Energy storage; Heat pump; Phase change; Solar energy
Public URL
Publisher URL
Additional Information Received: 2019-07-31; Accepted: 2019-11-26; Published: 2019-12-13


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