Experimental Investigation of Trans-critical CO2 Heat Pump High-Temperature Water Heater

被引：0
|
作者：
Zhu, Yin-Hai [1 ]
Li, Cong-Hui [1 ]
Jiang, Pei-Xue [1 ]
机构：
[1] Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing,100084, China
来源：
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | 2018年 / 39卷 / 10期
关键词：
Heat pump systems - Compressors - Solar water heaters - Expansion - Pumps;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
This paper studied the influence of parameters such as discharge pressure, outlet temperature of water, compressor frequency and expansion valve opening degree on the performance of a trans-critical CO2 heat pump high-temperature water heater. There is an optimal discharge pressure for different water outlet temperature, and the optimal discharge pressure increases with the increase of inlet water temperature, at the same time the system performance decreases. Results also indicated that the system COP increases first and then decreases with the increase of the evaporation pressure. The effect of compressor frequency on system performance under the same opening degree of expansion valve is studied. Results showed that a maximum COP of 3.9 is reached when the compressor frequency is 85 Hz. © 2018, Science Press. All right reserved.
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页码：2113 / 2117
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