In this study, six cubic equations of state (CEoSs) were used to predict the Joule-Thomson coefficient (JTC), specific heat capacity (SHC), inversion curve (IC) and outlet temperature of the Joule-Thomson (JT) valve parameters. The accuracy of each CEoS was evaluated from the comparison of experimental data with obtained results. Of the six CEoSs, three-paramter CEoSs— Esmaeilzadeh and Roshanfekr (ER), Harmen and Knapp (HK), and Patel and Teja (PT)— were more accurate than two-paramter equations— Nasrifar and Moshfeghian (NM), Peng-Robinson (PR), and Soave-Redlich-Kwong (SRK). Ironically, original SRK showed the optimum accuracy in estimation of JTC. In addition, the Joule-Thomson inversion curves (JTIC) were plotted for pure gases. Most of the CEoSs showed reasonable prediction on low-temperature branch of JTIC, but only original SRK and PT CEoSs estimated well at high-temperature branch. For two-parameter CEoSs, the effect of employing different α-functions and adding volume translation factor were also examined. The error analysis showed that the accuracy of original PR CEoS was significantly improved when volume translation factor was included as a third parameter. In addition, the SRK-Twu88 and PR-Twu91 CEoSs showed higher accuracy in prediction of SHC as compared to original SRK and original PR.

在这项研究中，使用六个立方状态方程（CEoSs）来预测焦耳-汤姆森系数（JTC），比热容（SHC），反演曲线（IC）和焦耳-汤姆森（JT）阀门参数的出口温度。通过比较实验数据和获得的结果来评估每个CEoS的准确性。在这六个CEoS中，三参数CEoS（Esmaeilzadeh和Roshanfekr（ER），Harmen和Knapp（HK）以及Patel和Teja（PT））比两参数方程式Nasrifar和Moshfeghian（NM），Peng- Robinson（PR）和Soave-Redlich-Kwong（SRK）。具有讽刺意味的是，原始SRK在估算JTC方面显示出最佳精度。另外，绘制了纯气体的焦耳-汤姆森反演曲线（JTIC）。大多数CEoS对JTIC的低温分支显示出合理的预测，但是只有原始的SRK和PT CEoS在高温分支估计良好。对于两参数CEoS，还检查了采用不同α函数和增加体积转化因子的效果。误差分析表明，将体积转化因子作为第三个参数时，原始PR CEoS的准确性得到了显着提高。此外，与原始SRK和原始PR相比，SRK-Twu88和PR-Twu91 CEoSs在预测SHC方面显示出更高的准确性。