Recent trends in the development of Helmholtz energy equations of state and their application to 3,3,3-trifluoroprop-1-ene (R-1243zf)
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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DOI：
10.1080/23744731.2016.1208000
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发表时间：
2016-09
影响因子：
1.9
通讯作者：
R. Akasaka
中科院分区：
文献类型：
--
作者：
R. Akasaka
本文简要地评述了亥姆霍兹能量状态方程的最新发展趋势。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被有效地用于优化。这种拟合技术使得有可能开发一个可靠的状态方程的流体有限的实验数据。证明了3，3，3-三氟丙-1-烯（R-1243 zf; CAS号677-21-4）的拟合。实验数据的临界参数，蒸汽压，液体和蒸汽密度，包括在饱和状态下，可用于这种制冷剂。拟合得到一个有17项的方程。状态方程适用于234 ~ 376 K的温度和35 MPa的压力。与实验数据的比较和外推行为的验证表明，状态方程具有大多数技术应用的潜力。
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 376 K 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.