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

Feng Cao; Ce Cui; Xiangyu Wei; Xiang Yin; Mingjia Li; Xiaolin Wang

doi:10.1016/j.ijrefrig.2019.05.004

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

Feng Cao^*, Ce Cui, Xiangyu Wei, Xiang Yin, Mingjia Li, Xiaolin Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

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 −20 °C to 0 °C, 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%.

Original language	English
Pages (from-to)	539-548
Number of pages	10
Journal	International Journal of Refrigeration
Volume	106
DOIs	https://doi.org/10.1016/j.ijrefrig.2019.05.004
Publication status	Published - Oct 2019
Externally published	Yes

Keywords

CO transcritical system
Combined system
Optimization
Space heating

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10.1016/j.ijrefrig.2019.05.004

Cite this

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title = "The experimental investigation on a novel transcritical CO2 heat pump combined system for space heating",

abstract = "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 −20 °C to 0 °C, 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%.",

keywords = "CO transcritical system, Combined system, Optimization, Space heating",

author = "Feng Cao and Ce Cui and Xiangyu Wei and Xiang Yin and Mingjia Li and Xiaolin Wang",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd and IIR",

year = "2019",

month = oct,

doi = "10.1016/j.ijrefrig.2019.05.004",

language = "English",

volume = "106",

pages = "539--548",

journal = "International Journal of Refrigeration",

issn = "0140-7007",

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T1 - The experimental investigation on a novel transcritical CO2 heat pump combined system for space heating

AU - Cao, Feng

AU - Cui, Ce

AU - Wei, Xiangyu

AU - Yin, Xiang

AU - Li, Mingjia

AU - Wang, Xiaolin

PY - 2019/10

Y1 - 2019/10

N2 - 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 −20 °C to 0 °C, 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%.

AB - 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 −20 °C to 0 °C, 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%.

KW - CO transcritical system

KW - Combined system

KW - Optimization

KW - Space heating

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DO - 10.1016/j.ijrefrig.2019.05.004

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EP - 548

JO - International Journal of Refrigeration

JF - International Journal of Refrigeration

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

Abstract

Keywords

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