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

为了研究环境温度变化对采用电子膨胀阀和模块化能量调节系统的风冷热泵冷(热)水模块化机组制冷和制热性能的影响,对5台制冷量60kW的机组在出水温度5～12℃、环境干球温度25～42℃、相对湿度40%工况条件下进行实验,得出一系列制冷量、制冷消耗功率、制冷COP、制热量、制热消耗功率和供热COPh实验数据,并得出环境温度对机组这些性能参数的影响规律;同时,通过比较实验机组和以热力膨胀阀作节流元件的风冷热泵机组,总结出前者具有更良好的能量调节性能和节能性能,并且设备运行的实际工况偏离设计工况越远,如在环境温度40℃,相同的7℃出水温度条件下,及在环境温度0℃,相同的45℃出水温度条件下,前者的制冷COP是后者的1.54倍、供热COPh是后者的1.61倍,设备性能得到明显改善。

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℃.