PREDICTION OF PHASE EQUILIBRIA FOR REFRIGERANT MIXTURES OF DIFLUOROMETHANE(HFC-32), 1,1,1,2-TETRAFLUOROETHANE (HFC-134A), AND PENTAFLUOROETHANE (HFC- 125A) USING SAFT-VR
PREDICTION OF PHASE EQUILIBRIA FOR REFRIGERANT MIXTURES OF DIFLUOROMETHANE(HFC-32), 1,1,1,2-TETRAFLUOROETHANE (HFC-134A), AND PENTAFLUOROETHANE (HFC- 125A) USING SAFT-VR
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使用 SAFT-VR 预测二氟甲烷 (HFC-32)、1,1,1,2-四氟乙烷 (HFC-134A) 和五氟乙烷 (HFC-125A) 制冷剂混合物的相平衡
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
A. Burgess
中科院分区：
文献类型：
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作者：
A. Galindo;A. Gil;P. Whitehead;G. Jackson;A. Burgess
采用可变范围吸引势链分子统计关联流体理论（SAFT-VR）对三种二元混合物的相平衡进行了建模，这些二元混合物由二氟甲烷（HFC-32）、1,1,1,2-四氟乙烷（HFC-134a）和五氟乙烷（HFC-125a）组成。分子表示为具有短程吸引位点的球形片段链。分子间范德华力用变量程方阱建模。通过对各纯组分的蒸气压和饱和液密度的实验数据进行拟合，得到了模型参数的优化值。这些参数是球形片段的数量和直径，以及描述位点-位点和片段-片段相互作用的电位的强度和范围。利用纯组分参数值和标准组合规则，可以很准确地描述混合物的相平衡。SAFT-VR提高了模型的预测能力。
The statistical associating fluid theory for chain molecules with attractive potentials of variable range (SAFT-VR) is used to model the phase equilibria for three binary mixtures formed by difluoromethane (HFC-32), 1,1,1,2-tetrafluoroethane (HFC-134a), and pentafluoroethane (HFC-125a). Molecules are represented as chains of spherical segments with short-ranged attractive sites. The intermolecular van der Waals forces are modeled with variable-range square-wells. The optimized values of the parameters of the model are obtained by fitting to experimental data for the vapor pressures and saturated liquid densities of each of the pure components. These parameters are the number and diameters of the spherical segments and the strengths and ranges of the potentials describing the site−site and segment−segment interactions. Using the values of the pure-component parameters and standard combining rules, the phase equilibrium of the mixtures is described very accurately. SAFT-VR improves the predictive power of m...