A new analytical fundamental equation of state (EOS) is presented for fluids. The equation is explicit in the effective molecular potentials and allows calculation of all thermodynamic properties over the whole fluid surface (gas, liquid, supercritical and gas–liquid phase transition). Outside the critical area (± 0.05T _c), it is valid in a vast range of temperature and pressure (0.8T _c to 7.5T _c and up to 120P _c,). The EOS is applicable for a variety of refrigerants such as C₃H₂F₄ (HFO‐1234ze (E)), hydrofluorocarbons (HFCs) including C₃F₈ (R218), C₃H₂F₆ (R236ea), C₃H₂F₆ (R236fa), C₃H₃F₅ (R245ca), C₃HF₇, C₄F₈ (RC318), C₄F₁₀, C₅F₁₂, natural refrigerants including NH₃, CO₂, hydrocarbons, monatomic gases and some other fluids. Calculations of second derivatives properties of fluids are sensitive tests of EOS behavior. Therefore, estimation of the thermodynamic properties including Joule‐Thomson coefficient, μ _JT, and speed of sound, w, has been considered.

中文翻译：

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确定制冷剂热力学量的新分析模型

提出了一种新的流体状态基本分析方程（EOS）。该方程在有效分子势中很明确，可以计算整个流体表面上的所有热力学性质（气体，液体，超临界和气-液相转变）。在临界区域之外（±0.05 T _c），它在很大的温度和压力范围内（0.8 T _c至7.5 T _c以及最高120 P _c）有效。EOS适用于各种制冷剂，例如C ₃ H ₂ F ₄（HFO-1234ze（E）），氢氟碳化合物（HFC）包括C ₃ F ₈（R218），C₃ H ₂ F ₆（R236ea），C ₃ H ₂ F ₆（R236fa），C ₃ H ₃ F ₅（R245ca），C ₃ HF ₇，C ₄ F ₈（RC318），C ₄ F ₁₀，C ₅ F_参照图12，天然制冷剂包括NH ₃，CO ₂，碳氢化合物，单原子气体和一些其他流体。流体的二阶导数特性的计算是对EOS行为的敏感测试。因此，估算热力学性质包括焦耳-汤姆森系数，μ _JT和声音的速度W，已经考虑。