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作者根据Rombusch方程编制了计算机程序,并以氨制冷工质为例,分别算出了过热区、两相区和饱和液体线上的热物性数值。经和手册中的数值相比较,饱和蒸汽线上各物性参数的最大相对误差为0.0245％,饱和液体线上各物性参数的最大相对误差为2.187％。该物性方程和作者所编的程序还可计算R22、R502等制冷工质的热物性。作为应用的一个实例,对冷凝温度自30℃至45℃,蒸发温度自-20℃至10℃的数个单级氨理论循环的性能指标作了计算,得出了诺模图。
Based on the Rombusch equation, the author compiles a computer program and takes the refrigerant of ammonia as an example to calculate the thermophysical properties of the overheat zone, the two-phase zone and the saturated liquid line respectively. Compared with the values in the manual, the maximum relative error of the physical parameters on the saturated steam line is 0.0245%, and the maximum relative error of the physical parameters on the saturated liquid line is 2.187%. The physical equation and the author’s program can also calculate the thermal properties of refrigerant refrigerants such as R22, R502. As an example of application, the performance of several single-stage ammonia cycles with condensing temperature ranging from 30 ℃ to 45 ℃ and evaporating temperature from -20 ℃ to 10 ℃ was calculated, and the nomogram was obtained.