THERMODYNAMIC ANALYSIS AND EXPERIMENTAL RESEARCH OF TRANSCRITICAL CO2 WITH DOUBLE THROTTLE VALVE SYSTEM
This work present the experimental evaluation of the energy performance of transcritical CO2 refrigeration and heat pump systems.The optimal gas cooler pressures and the optimal COP have been analysed from an thermodynamic point of view.The systems used a new dual expansion valve and a balance CO2 liquid receiver adjustment device,which can control high and low side pressure effectively.Moreover demonstrate the influence of the internal heat exchanger (IHX) on the system performances,on the basis of the analysis the relative COP index RCOPI and compressor power index RPCI and other parameters which can confirm the truth of.The experimental evaluation covers five evaporating levels(-10 to 10℃) and in a wide range of gas cooler pressures(75 to 120bar).It is concluded that: With the IHX system compressor power is relatively low,when the high side pressure is over 100bar,and the evaporation temperature is below 0℃.The COP of the system without IHX is slightly higher than the system with IHX,it is increase about 3% to 5%,when the evaporation temperature is over 5℃.Relative to the single throttling process the double can decrease influence pressure fluctuations of CO2 supercritical fluid and liquid mixture on the systems.providing the experimental basis for the development of the transcritical CO2 refrigerant and heat pump systems.
Transcritical CO2 IHX COP Double throttle valve Experimental Thermodynamic
Wang Zhe Gong Yi Wu Xuehong Zhang Wenhui Li Yaqiang
Department of Electrical and Mechanical Engineering,Refrigeration and Cryogenic Center,Zhengzhou University of Light Industry,Henan,Zhengzhou,No.5 Dongfeng Road,450002,P.R.China
国际会议
西安
英文
1-9
2012-08-26（万方平台首次上网日期，不代表论文的发表时间）