Thermodynamic property models for the difluoromethane (R-32)+trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)) and difluoromethane+2,3,3,3-tetrafluoropropene (R-1234yf) mixtures
Thermodynamic property models for the difluoromethane (R-32)+trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)) and difluoromethane+2,3,3,3-tetrafluoropropene (R-1234yf) mixtures
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DOI：
10.1016/j.fluid.2013.07.057
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发表时间：
2013-11-25
影响因子：
2.6
通讯作者：
Akasaka, Ryo
中科院分区：
文献类型：
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作者：
Akasaka, Ryo
对于R-32/1234ze(E)和R-32/1234yf混合物，建立了以亥姆霍兹能量表示的热力学性质模型。混合物的亥姆霍兹能量被表示为理想混合物贡献和混合贡献之和。自变量是温度、摩尔体积和组成。采用最精确的纯流体状态方程来计算理想混合物的贡献。通过对现有实验数据的拟合，确定了混合的贡献。模型计算物性的不确定度估计为：泡点压力为1%，液体密度为0.25%。模型合理地表达了混合物的临界轨迹。计算的临界温度与+/-0.8K(C)2013 Elsevier B.V.内的实验值一致。保留所有权利。
Thermodynamic property models explicit in the Helmholtz energy are presented for the R-32/1234ze(E) and R-32/1234yf mixtures. The Helmholtz energy of the mixtures are expressed as the sum of the ideal mixture contribution and the contribution from mixing. The independent variables are the temperature, molar volume, and composition. The most accurate pure-fluid equations of state are incorporated to calculate the ideal mixture contribution. The contribution from mixing is determined by fitting to available experimental data. The estimated uncertainties in calculated properties from the models are 1% for the bubble point pressure and 0.25% for liquid density. The critical loci of the mixtures are reasonably represented with the models. The calculated critical temperatures correspond to experimental values within +/- 0.8 K. (C) 2013 Elsevier B.V. All rights reserved.