空气源-水环热泵联合系统性能分析

Performance analysis of air-source and water loop heat pump combined system

建立空气源-水环热泵联合系统的模型,通过改变空气源-水环热泵联合系统的空气源热泵冷凝温度及蒸发温度,得到联合系统不同工况下的最佳性能系数。研究结果表明:在供水温度分别为45℃和50℃时,系统性能系数均在空气源热泵冷凝温度16℃时达到最大值,分别为2.128和1.954,供水温度为55℃时,系统性能系数在空气源热泵冷凝温度18℃时达到最大值1.805;供水温度分别为45℃,50℃和55℃时,单级系统(仅运行空气源热泵系统)、双级系统(空气源-水环热泵联合系统)相互切换的最佳蒸发温度分别为-2℃,-13℃和-23℃。指出根据不同工况及时调整热泵系统的运行方式能够提高系统能效。

The model of air-source and water loop heat pump combined system is established.By changing the condensing temperature and evaporating temperature of the airsource heat pump,the optimal COPof the combined system under different operating conditions is obtained.The study results show that when the water supply temperatures are45℃and 50℃,the COPof the system reaches the maximum value at 16℃of the condensing temperature for air-source heat pump,which are 2.128 and1.954,respectively;when the water supply temperature is 55℃,the COPof the system reaches the maximum value at 18℃of the condensing temperature for air-source heat pump,which is 1.805;when the water supply temperatures are 45℃,50℃and 55℃,the optimal evaporating temperatures of the single-stage system(only running the air-source heat pump system)or double-stage system(air-source heat pump and water loop heat pump combined system)are-2℃,-13℃and-23℃,respectively.It is pointed out that by adjusting the operation mode of the heat pump system in time according to different operating conditions,it can improve the energy efficiency ratio of the system.