非共沸制冷剂非完全冷凝现象的假想及判据

Assumption and criterion of incomplete condensation of zeotropic refrigerants

为了探讨空调系统中非共沸制冷剂的变工况循环特性,揭示系统循环参数与冷凝器中的换热流体温度和流量之间的关系,进行了大量的实验研究。根据实验数据发现了一种特殊的实验现象,即在换热流体进口温度不变的前提下,系统性能系数(COP)随换热流体流量的逐步增大呈现先升高后降低的特性,为解释此现象提出了制冷剂非完全冷凝的假想。在此基础上,初步建立了非共沸制冷剂非完全冷凝的理论判据,并将该判据推广应用到了15种已商品化的非共沸制冷剂上,预测了这些制冷剂发生非完全冷凝现象的条件。

Experiments were performed to study the cycling characteristics of varying working conditions of zeotropic refrigerants in air conditioning systems and to reveal the relationship among cycling parameters, temperature and flow rate of heat transfer fluids in condenser. Based on the experimental data, it was found that the coefficient of performance （COP） increased at the start and decreased at the end with gradually increasing flow rates of heat transfer fluids and the temperature at the condenser inlet unchanged. An assumption about the incomplete condensation of refrigerants was made to explain this phenomenon and the criterion of incomplete condensation was established. According to this criterion, the conditions of incomplete condensation of 15 commercialized zeotropic refrigerants were predicted.