冰蓄冷柜式空调系统的充冷过程模拟

分析了多室内蒸发器的冰蓄冷柜式空调系统的流程和性能优点 ,建立了蓄冰槽充冷过程的数学物理模型 ,对换热管的每一个管段 ,根据热阻网络建立了描述其换热过程的差分方程组 .对方程组的求解得到了系统充冷过程的描述 ,揭示了该系统在制冰充冷过程中各参数之间的耦合关系和变化规律 .通过对蓄冰槽的充冷过程的模拟计算 ,可以看出在制冷剂干度超过 0 .6时 ,干度的增加将显著降低管内换热系数 ,从而明显地延缓充冷过程 .因此 ,可采用在制冰的中间过程中调换制冷剂的入口和出口来增加管外结冰的均匀性和提高结冰过程的性能 .此外 ,适当降低带蒸发器蓄冰槽的蓄冰率是合宜的

Simulation of Charging Process of An Ice Storage Tank Air Conditioning System

The flow and performance characteristics of ice storage tank air conditioning system with multi evaporators were analyzed. The numerical model of ice storage tank during charging process was developed. For each axial segments of the heat exchange tube, differential equations were given according to the heat resistance network. As results of the simulation of charging process in the ice storage tank, the heat transfer coefficient of refrigerant in the tube decreases dramatically and the charging process is postponed with the increase of the quality of vapor liquid mixture when the latter is above 0.6. Thus the performance of charging process and the uniformity of ice on the outside of tube can be improved by exchanging the entrance and exit of refrigerant in the charging process. In addition, it is reasonable to decrease ice packing factor of the ice storage tank with evaporator properly.