| 摘要: |
| 本文从理论方面研究了混合制冷剂的相平衡特性，基于Peng-Robinson (PR)状态方程与Wong-Sandler (WS)混合法则，结合Predictive Soave Redlich Kwong (PSRK)方程中使用的UNIFAC基团贡献法，构建了混合物气液相平衡预测模型(PRWS-UNIFAC-PSRK)。结果表明：二元混合物R32/R1234yf的压力及气相质量分数的模拟结果与实验值偏差分别在±2.5%和±0.02内；三元混合物R134a/R1234yf/R600a的压力及气相组分质量分数计算值与实验数据的偏差基本在±3%和±0.04内；建立了R1234yf/R290/R134a系的三元相平衡图，当质量分数在0.25/0.7/0.05左右时存在共沸点。通过采用多参数状态方程，改进活度系数模型，获取更为准确的二元相互作用系数，可进一步提高模型的预测精度。 |
| 关键词: 气液相平衡 R1234yf 计算机模拟 共沸点 |
| DOI： |
| 投稿时间：2017-01-06
|
| 基金项目:国家自然科学基金(5117612)资助项目。 |
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| Simulation on Vapor Liquid Equilibria of R1234yf/R290/R134a Ternary System |
|
Qin Yanbin, Zhang Hua, Wu Yinlong
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| (Institute of Refrigeration and Cryogenic Engineering, University of Shanghai for Science and Technology) |
| Abstract: |
| Based on the Peng Robinson (PR) equation of state combined with the Wong-Sandler (WS) mixing rule, and combined with the UNIFAC group contribution method used in the Predictive Soave Redlich Kwong (PSRK) equation, a gas-liquid equilibrium prediction model of the mixture (PRWS-UNIFAC-PSRK) was constructed. The results indicate that for the R32/R1234yf binary mixture, the deviations between the experimental and calculated data for the pressure and vapor phase mass fraction are within ±2.5% and 0.02, respectively. For R134a/R1234yf/R600a ternary mixture, the relative deviation between the measured pressures and calculated results are within ±3% and the absolute deviation of vapor phase mass fraction is within ±0.04. In ternary phase equilibria diagram of R1234yf/R290/R134a, the mass fraction of R1234yf/R290/R134a at around 0.25/0.7/0.05 has an azeotropic point. The VLE (vapor liquid equilibria) prediction model can be further improved by using the multi-parameter equation of states, improving the activity coefficient models and obtaining more accurate binary interaction coefficient. |
| Key words: vapor liquid equilibria R1234yf computer simulation azeotropic point |
