TY - JOUR
TI - Experimental study on optimal operation control strategy of quasi-two-stage compression heat pump air conditioning system based on full micro-channel heat exchanger
AU - Zhao Dengke
AU - Li Haijun
AU - Chen Gang
AU - Zhang Yibo
AU - Gao Jiayang
JN - Thermal Science
PY - 2025
VL - 29
IS - 3
SP - 1971
EP - 1979
PT - Article
AB - In environments with significant temperature variations, the quasi-two-stage  compression heat pump air conditioning system demonstrates notable  advantages in mitigating key challenges such as high compressor exhaust  temperature, exhaust pressure, low system heat exchange, and COP. This  study optimizes the optimal refrigerant charge amount and superheat  set-point control strategy of the electronic expansion valve for the system.  By adjusting the method of supplying the gas and the superheat set-point of  the electronic expansion valve, the system is able to achieve stable and  efficient operation. The experimental findings indicate that following the  optimization of operational control strategies, the system heat exchange  capacity increased by 18.8%, the COP improved by 12.3%, and the compressor  exhaust temperature decreased by 11.3°C.