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J4  2012, Vol. 46 Issue (4): 610-615    DOI: 10.3785/j.issn.1008-973X.2012.04.006
Experimental study on CO2 air source heat pump water heater
CHEN Qi1, TONG Yang1, ZHU Zhi-jiang1, TANG Li-ming1,
CHEN Guang-ming1, LI Jian-jun2
1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China;
2. Zhejiang DunAn Artificial Environment Limited Company, Zhuji 311835, China
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A prototype of heat pump was developed in order to analyze the effects of outside factors on transcritical CO2 heat pump system performance. The system performance was investigated by changing volume flow rate or inlet temperature of cooling water, and ambient temperature. Trends of systematic parameters such as CO2  mass flow rate, pressure ratio, heating capacity and heating coefficient of performance (COPh) were analyzed. The effects of compressor isentropic efficiency and heat transfer effectiveness of gas cooler on COPh were considered. The experimental results for the test conditions showed that CO2 mass flow rate, pressure ratio and compressor power consumption reduced, heat capacity and COPh increased when cooling water volume flow rate increased or inlet temperature decreased. When ambient temperature increased, CO2 mass flow rate and heat capacity had an increase, pressure ratio and compressor power consumption were almost same, and COPh increased. The compressor isentropic efficiency and heat transfer effectiveness of gas cooler were two key factors to increase COPh.

Published: 17 May 2012
CLC:  TB 61  
Cite this article:

CHEN Qi, TONG Yang, ZHU Zhi-jiang, TANG Li-ming, CHEN Guang-ming, LI Jian-jun. Experimental study on CO2 air source heat pump water heater. J4, 2012, 46(4): 610-615.

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