期刊
RENEWABLE ENERGY
卷 178, 期 -, 页码 574-586出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.06.082
关键词
Internal heat exchanger; Transcritical CO2 heat pump; Actual increase rate of COP; Exergy efficiency
资金
- China Postdoctoral Science Foundation [2020TQ0276, 2020M672272]
This study investigates the impact of the internal heat exchanger on the performance of transcritical CO2 heat pump system, and proposes two evaluation methods to assess this impact. The research findings suggest that the influence of the internal heat exchanger on system performance can be effectively evaluated by the actual increase rate of COP. Furthermore, the results show that the effect of the internal heat exchanger on exergy efficiency varies at different discharge pressures and ambient temperatures.
With the increasing demand for environmental protection, CO2, as a natural refrigerant, has always been environmentally friendly and safe, which makes transcritical CO2 heat pump system attract more attention. The internal heat exchanger is employed to improve the performance of transcritical CO2 heat pump system to match the traditional heat pump circulation system. In this work, two evaluation methods are proposed, one is the actual operation thermal effectiveness of internal heat exchanger, the other is the actual increase rate of COP. Compared with the experimental results, the conclusions can be extracted that the actual increase rate of COP can effectively evaluate the impact of the internal heat exchanger on system performance. In addition, this research deeply analyzes the influence of the internal heat exchanger on exergy efficiency. The results show that the internal heat exchanger greatly reduces the exergy efficiency under the discharge pressure of 7310 kPa and the ambient temperature of 15 degrees C, and the difference value between the system with and without internal heat exchanger reaches 39%. However, the influence of the internal heat exchanger on exergy efficiency decreases with the increase of discharge pressure and ambient temperature, the minimum difference value is only 0.1% at 11000 kPa and 30 degrees C. (C) 2021 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据