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The experimental investigation on a novel transcritical CO2 heat pump combined system for space heating


Cao, F and Ce, C and Wei, X and Yin, X and Li, M and Wang, X, The experimental investigation on a novel transcritical CO2 heat pump combined system for space heating, International Journal of Refrigeration, 106 pp. 539-548. ISSN 0140-7007 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 Elsevier Ltd and IIR

DOI: doi:10.1016/j.ijrefrig.2019.05.004


Performance improvement methods attending to sub-cool CO2 at the gas-cooler outlet to improve the system COP and reduce the optimum discharge pressure by combining another system have been popular recently. In this paper, a novel transcritical CO2 heat pump combined system prototype was developed and experimentally investigated. Experimental data demonstrated that an optimal discharge pressure existed for the both individual systems in the proposed combined system. The frequency ratio of the two compressors was found to have a great influence on the system performance and an optimal ratio also existed according to the experimental data. When the ambient temperature increased from −20C to 0C, the system COP increased by 22%. The comparison results showed the combined system could improve the COP up to 15.3% comparing to the standard transcritical CO2 heat pump system and that the optimal discharge pressure was decreased by up to 39%.

Item Details

Item Type:Refereed Article
Keywords:CO2 transcritical system, space heating, combined system, optimization
Research Division:Engineering
Research Group:Mechanical engineering
Research Field:Energy generation, conversion and storage (excl. chemical and electrical)
Objective Division:Energy
Objective Group:Energy efficiency
Objective Field:Residential energy efficiency
UTAS Author:Wang, X (Professor Xiaolin Wang)
ID Code:134416
Year Published:2019
Web of Science® Times Cited:11
Deposited By:Engineering
Deposited On:2019-08-12
Last Modified:2020-01-14

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