Analysis on approaches for increasing heat supplying temperature of CO2 transcritical heat pump

被引：0

作者：

Shi W. ^{[1
]}

Ji X. ^{[1
]}

Pan L. ^{[2
]}

Lyu Y. ^{[1
]}

Wei X. ^{[2
]}

机构：

[1] School of Environmental and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing

[2] State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing

来源：

Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2022年 / 43卷 / 04期

关键词：

Carbon dioxide; Centrifugal compressor; Heat pump system; High temperature application;

D O I：

10.19912/j.0254-0096.tynxb.2021-1349

中图分类号：

学科分类号：

摘要：

The transcritical heat pump with CO2, an environmentally friendly natural working fluid, shows great potential in high temperature heating. A CO2 transcritical pressurization analysis model and a CO2 transcritical heat pump analysis model have been established. Based on them, the effects of different pressurization processes on COP, outlet temperature and mass flow rate of water in gas cooler are studied. The results show that both approaches can improve the isentropic efficiency, power and outlet working fluid temperature of the compressor, and increase the outlet water temperature of the gas cooler, but decrease the COP and hot water mass flow. In general, when increasing the outlet water temperature of gas cooler, the approach of increasing the suction superheat makes power increases slightly, but the COP decreases greatly, which can increase hot water temperature in a small range. By increasing the compressor outlet pressure, the hot water temperature is higher, the controllable range is larger, and COP has a smaller decline. © 2022, Solar Energy Periodical Office Co., Ltd. All right reserved.

引用

页码：104 / 111

页数：7

共 15 条

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