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文章介绍利用状态方程对多组分物系有相变过程时熵差的计算方法。用GDSRK方程编制了含非烃的链烷烃天然气膨胀制冷有相变过程熵差的计算程序。在计算有相变的膨胀制冷过程的等熵效率时应考虑相变的影响。计算表明,结果更可靠更精确,并且考虑相变影响时的等熵效率略高于不考虑相变时的效率。
This paper introduces the method of calculating the entropy difference when using the state equation for the phase change process of multi-component system. Using GDSRK equation, a calculation program of the entropy difference of the phase transition during the expansion refrigeration of non-hydrocarbon containing natural gas was developed. The influence of phase transformation should be considered when calculating the isentropic efficiency of a phase expansion expansion refrigeration process. Calculations show that the results are more reliable and accurate, and the isentropic efficiency when considering the influence of phase transition is slightly higher than that without considering the phase transition.