环境温度对采用电子膨胀阀的风冷热泵冷(热)水模块机组性能的影响

Influence of ambient temperature on performance of modular air-cooled chilled(hot)water units with electronic expansion valve

Five modular air-cooled chilled(hot)water units with 60 kW of refrigerating output were used to carry out experiments.With leaving water temperature at 5—12℃, dry-bulb temperature at 25—42℃, and the relative humidity of 40%, the chilling and heating performance of modular air-cooled chilled(hot)water units with electronic expansion valve and modular energy regulation system was studied at changing ambient temperature.A series of experimental data about refrigerating capacity, power consumed by refrigeration, refrigerating COP, heating capacity, power consumed by heating and heating COP were obtained, and the influence of ambient temperature on the performance was evaluated.The comparison shows that the air-cooled chilled(hot)water units with electronic expansion valve and modular energy regulation system present better energy regulation performance and energy saving performance than the air-cooled heat pump units with thermal expansion valve, especially when the working condition deviates more from the designed working condition.For example, the refrigerating COP of the former is 1.50 times that of the latter and the heating COP is 1.61 times that of the latter at the ambient temperature of 40℃ and leaving water temperature of 7℃, and at the ambient temperature of 0℃ and leaving water temperature of 45℃.