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Experimental investigation of a novel two-stage heat recovery heat pump system employing the vapor injection compressor at cold ambience and high water temperature conditions

Li, Yunhai; Li, Zhaomeng; Fan, Yi; Zeng, Cheng; Cui, Yu; Zhao, Xudong; Li, Jing; Chen, Ying; Chen, Jianyong; Shen, Chao

Authors

Yunhai Li

Zhaomeng Li

Yi Fan

Cheng Zeng

Yu Cui

Ying Chen

Jianyong Chen

Chao Shen



Abstract

Heat pumps (HPs) are energy-efficient space heating devices that are key to global carbon reduction and carbon neutrality. However, current commercial HPs have performance issues in cold climates where space heating is needed most, including low COP and high energy consumption of defrosting. Aiming to tackle these issues, a novel two-stage heat recovery heat pump (THRHP) is therefore developed to enable heat recovery from exhaust air for improving COP and preventing dramatic energy use during winter defrosting. The performance of THRHP was optimized in the laboratory by investigating its expansion valve opening and exhaust air fans situation. Finally, the experiment results showed the prototype provided a heating capacity of 32.3 kW, generating 4 m3/h hot water of 55 °C with COP of 2.57 at outdoor temperature of 0 °C, achieving 20.1% higher COP than the commercial HPs, while the efficient and quick defrosting process only consumed 0.46 kW and 4 mins under outdoor temperature on −6 °C. The results gave more insights into the characteristics of THRHP and obtained the optimal control strategies of THRHP for better performance, thus promoting the wide deployment of HPs and achieving the ambitious carbon-neutrality targets.

Citation

Li, Y., Li, Z., Fan, Y., Zeng, C., Cui, Y., Zhao, X., Li, J., Chen, Y., Chen, J., & Shen, C. (2023). Experimental investigation of a novel two-stage heat recovery heat pump system employing the vapor injection compressor at cold ambience and high water temperature conditions. Renewable energy, 205, 678-694. https://doi.org/10.1016/j.renene.2023.01.101

Journal Article Type Article
Acceptance Date Jan 26, 2023
Online Publication Date Feb 3, 2023
Publication Date Mar 1, 2023
Deposit Date Apr 22, 2023
Publicly Available Date Feb 4, 2024
Journal Renewable Energy
Print ISSN 0960-1481
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 205
Pages 678-694
DOI https://doi.org/10.1016/j.renene.2023.01.101
Keywords Heat pump; Exhaust air; Heat recovery; Defrosting; Performance optimization
Public URL https://hull-repository.worktribe.com/output/4202155

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