冷水相变能热泵系统中相变换热器两侧水温变化时的结冰特性是换热器结构及系统设计的重要依据。为明确不同水温属于何种结冰工况，本文给出了冷水相变换热器的物理模型，并建立了其传热的数学模型，模拟了中介及冷水侧进水温度变化时的传热过程，依次分析了水温变化对换热量、冰层厚度及除冰能耗的影响，并给出了结冰工况的水温分区图。结果表明：在结冰工况水温分区图中，主动与被动结冰工况的分界线大致为斜率等于0.2的直线；被动与零结冰工况的分界线大致为斜率等于0.4的直线。待冰层生长稳定后，对于主动结冰工况，换热量较无冰层时降低8.07%～11.81%，相变换热器需采用除冰装置定期除冰；对于被动结冰工况，换热量较无冰层时降低0.56%～4.08%，无需进行除冰，但换热管间需预留12 mm的间距以防冰堵。

Icing characteristics on both sides of phase change heat exchanger in cold water phase change energy heat pump system upon water temperature change are the important basis of heat exchanger structure and system design. To specify the specific icing working condition of different water temperatures, the physical model of cold water phase change heat exchanger was given to establish its mathematical model of heat transfer, the heat transfer process during change of water inlet temperature on the intermediary side and cold water side was simulated to successively analyze the impact of water temperature change on heat exchange amount, ice layer thickness and deicing energy consumption, and the water temperature partition map of icing working condition was offered. The results indicate that in the partition map of water temperature, the boundary between active and passive icing conditions is roughly a straight line with a slope of 0.2; the boundary between passive and zero icing conditions is roughly a straight line with a slope of 0.4.After steady growth of ice layer, for the active icing working condition, heat exchange amount decreases by 8.07% to 11.81% in comparison of icefree layer, and the phase change heat exchanger shall conduct regular deicing with deicing device; for the passive icing working condition, heat exchange amount decreases by 0.56% to 4.08% in comparison of ice free layer, and it isn′t necessary to conduct deicing, but 12 mm spacing shall be reserved between heat exchange tubes to prevent ice block.

TU831.3

青岛市民生科技计划项目“低品位能源供热供冷技术及应用示范”（19-6-1-79-NSH）