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基于现有理论循环性能分析方法,采用工质状态方程结合实验所得出工质的P-V-T关联式进行有机工质热力学性质的联合计算,同时结合热力学一般关系式计算出该工质的导出热力学参数。应用改进的理论循环性能计算方法,以HFC134a纯工质,在冷凝温度20~50℃、循环温升45~70℃的设计运行工况范围内进行热泵循环的循环效率和循环参数间关系以及循环参数选择和系统回热循环性能的特性研究。对该型工质的低温热泵系统,当循环有合理温升时,其有更高COP和较小的压比,得到了在各种应用条件下热泵的最优参数和最优循环。计算结果表明纯质HFC134a具有作为超低温热泵工质的潜力。
Based on the existing theory of cyclic performance analysis, the P-V-T correlation of working fluid was used to calculate the thermodynamic properties of the working fluid using the equation of state of the working fluid and the thermodynamic parameters of the working fluid were calculated by the general thermodynamic relationship. By using the improved theoretical cycle performance calculation method, the relationship between the cycle efficiency of the heat pump cycle and the cycle parameters and the cycle in the design operating conditions of the condensing temperature of 20 to 50 ° C and the temperature of 45 to 70 ° C are achieved by using HFC134a pure substance, Study on the Characteristics of Parameter Selection and System Regeneration Cycle Performance. The low temperature heat pump system for this type of working medium, when the cycle has a reasonable temperature rise, it has a higher COP and a smaller pressure ratio, the optimal parameters and optimal cycle of the heat pump under various application conditions. The results show that the pure HFC134a has potential as a cryogenic heat pump.