内融冰式冰盘管蓄冷槽传热性能研究

内融冰式冰盘管蓄冷槽是一种广泛应用的空调蓄冷装置，对这种蓄冷槽传热性能的掌握对于工程应用非常重要．现有的这种蓄冰槽模型均为同心圆柱模型，不能反映冰水密度差对这种蓄冰槽传热性能的显著影响．本文对内融冰式冰盘管蓄冷槽的蓄冷（结冰）和取冷（融冰）实验结果进行了仔细的分析，建立了传热性能动态模型．采用同心圆柱模型描述蓄冷过程，而对取冷过程采用了准同心圆阶段、偏心阶段和碎冰阶段的三段动态模型．合理地反映了融冰过程不同阶段由于冰水密度差造成的换热速率变化的机理，因此模型的适应性强，预测性好．实验对比的结果也说明该模型能够准确地反映不同入口流量、入口温度蓄／取冷过程的蓄／取冷速率、出口温度的变化，因此可直接为工程应用服务

Study of Thermal Process of Internal Melt Ice-on-Coil Tank

Internal melt ice on coil tank with built in horizontal tubes is a kind of ice tank used widely. Well underatanding its thermal characteristics is very important to application to reduce design fault and operation risk. The existing models developed for internal melt ice on coil tank are concentric cylinder model for both charge and discharge processes, and cannot describe the effect of density difference between ice and water on the thermal process of the tank. This paper introduces the study on modeling of its thermal process. The model uses concentric cylinder model for ice formation, an a 3 stages model for melting process including quasi concentric cylinder, eccentric cylinder and ice pieces. The model with simple form well describes the effect of density difference between ice and water on the thermal process. Thereore, it is suitable to be used for system simulation. Experimental validation has proved the reliability and applicability of the methodology and the model.