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首页> 外文期刊>Science and Technology for the Built Environment >Recent trends in the development of Helmholtz energy equations of state and their application to 3,3,3-trifluoroprop-1-ene (R-1243zf)
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Recent trends in the development of Helmholtz energy equations of state and their application to 3,3,3-trifluoroprop-1-ene (R-1243zf)

机译：亥姆霍兹能态方程的发展及其在3,3,3-三氟丙-1-烯（R-1243zf）中的应用的最新趋势

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摘要

Recent trends in the development of Helmholtz energy equations of state are briefly reviewed. Optimization procedures have been improved over the last two decades, and now nonlinear least-square fitting is effectively used in the optimization. This fitting technique makes it possible to develop a reliable equation of state for fluids with limited experimental data. The fitting is demonstrated for 3,3,3-trifluoroprop-1-ene (R-1243zf; CAS number 677-21-4). Experimental data for the critical parameters, vapor pressures, and liquid and vapor densities, including those at the saturation state, are available for this refrigerant. The fitting results in an equation with 17 terms. The equation of state is valid for temperatures from 234 to 376K and for pressures up to 35 MPa. Comparisons to experimental data and verification of extrapolation behavior show that the equation of state has potential for most technical applications.
机译：简要回顾了亥姆霍兹能量状态方程发展的最新趋势。在过去的二十年中，优化程序得到了改进，现在非线性最小二乘拟合已有效地用于优化中。这种拟合技术可以为有限的实验数据开发出可靠的流体状态方程。证明了适用于3,3,3-三氟丙-1-烯（R-1243zf; CAS号677-21-4）。该制冷剂可获得关键参数，蒸气压以及液体和蒸气密度的实验数据，包括处于饱和状态的数据。拟合结果是一个包含17个项的方程式。状态方程适用于234至376K的温度以及最高35 MPa的压力。与实验数据的比较和外推行为的验证表明，状态方程在大多数技术应用中具有潜力。

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