蓄冷系统水平冰盘管外结冰数值模拟及分析

蓄冰桶是直接式蓄冷系统主要部件之一，主要由水平管或螺旋式盘管构成。蓄冰过程中，管内外存在两个复杂的相变过程，即管内液同相变过程和管外液固相变过程。文中建立了直接蒸发式盘管结冰过程的动态数学模型，利用有限差分法对模型进行了数值求解，并对模拟结果进行了讨论分析。该模型可应用于预测管外结冰量随时间的变化关系，因此，可为直接蒸发盘管蓄冰系统的设计及运行优化提供理论依据。

Numerical Simulation and Analysis on Dynamic Freezing Process for Ice-on-horizontal Coil in Thermal Energy System

Ice-on-coil storage tank, which consists chiefly of horizontal or spiral coils, is one of important components of direct ice storage system.During the process of ice storage,there are two complicated phase change heat transfer processes: one is liquid-gas phase change inside coils and the other belongs to liquid-solid phase change outside coils. A dynamic mathematical simulation model of direct evaluation ice-on-coil storage system was built using thermal enthalpy method and numerical solution obtained by finite difference method which can be used to determine the amount of time needed for solidification of water At the same time,the simulation results were discussed in detail and some optimal operating conditions and enhancement heat transfer strategies were suggested from the discussion results. Therefore, the mathematical model can provide a basis for the engineering design,research on systematic study,and operation of ice storage system.