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为了评价空调工况下非共沸制冷剂的循环特性,揭示非共沸制冷剂在冷凝器和蒸发器中与换热流体间传热温差的沿程分布规律,在制冷剂相变过程中非线性温-焓对应关系的基础上展开了相应的理论研究.首先,建立了制冷剂的冷凝和蒸发换热模型,并根据标准空调工况确定了制冷剂相变时的状态参数.然后,利用制冷剂状态方程得到了15种非共沸制冷剂相变过程中温度与焓值的对应关系,在一定假设的基础上计算出制冷剂和换热流体在相变过程中的传热温差.通过归纳换热器沿程各位置的温差变化,得到了它们的分布规律.最后,在对比了不同制冷剂由于传热温差的变化而引起的附加可用能损失后,给出了这15种制冷剂的性能评价.
In order to evaluate the cycle characteristics of non-azeotropic refrigerants under air conditioning conditions and to reveal the distribution along the process of heat transfer between non-azeotropic refrigerants in the condenser and evaporator and the heat transfer fluid, Based on the linear temperature-enthalpy correspondence, the corresponding theoretical research is started.Firstly, the condensation and evaporating heat transfer models of the refrigerant are established and the state parameters of the refrigerant phase transition are determined according to the working conditions of standard air conditioners.Then, The relationship between temperature and enthalpy in 15 kinds of non-azeotropic refrigerants phase transition was obtained by equation of state of refrigerant, and the heat transfer temperature difference between refrigerant and heat transfer fluid during the phase transition was calculated on the basis of some assumptions. Summed up the change of the temperature difference of each location along the heat exchanger, and got their distribution rules.Finally, after comparing the available available energy loss caused by the change of the heat transfer temperature difference of different refrigerants, the 15 kinds of refrigerants Performance evaluation.