The Effects of the Gas Cooler on Both the System Performance and the Optimal Discharge Pressure at a Transcritical CO2 Heat Pump
In order to research the effects of the gas-cooler heat transfer area and the mass velocity in the gas-cooler on the system performance and the optimal discharge pressure of a transcritical CO2 heat pump water-heater, a gas-cooler mathematical model in which the heat transfer area and the mass veloc...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2015-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2015.04.007 |
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| Summary: | In order to research the effects of the gas-cooler heat transfer area and the mass velocity in the gas-cooler on the system performance and the optimal discharge pressure of a transcritical CO2 heat pump water-heater, a gas-cooler mathematical model in which the heat transfer area and the mass velocity in it can be changed separately was built in this paper. The results show that the heating capacity and COP increase as the heat transfer area increases when the mass velocity is constant. Moreover, COP increases first and then declines with an increase in the mass velocity due to the influence of the pressure loss when the heat transfer area is constant. Additionally, the optimal discharge pressure declines as the heat transfer area increases, and it increases with an increase in the mass velocity. Thus, it should be considered properly to discuss the gas-cooler heat transfer area and the mass velocity in it to achieve superior COP and maintain the optimal discharge pressure when designing the transcritical CO2 heat pump. |
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| ISSN: | 0253-4339 |