Thermodynemic Properties of Mixture of Refrigerants and Refrigeration Oil

制冷剂与冷冻油混合物的热力学特性

• 批准号: 62550165
• 负责人: OGUCHI Kosei
• 金额: $ 1.15万
• 依托单位: Kanagawa Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550165/
• 关键词: Chlorofluorohydrocarbons; Refrigeration oil; Mixture; Thermodynamic properties; Vapor pressure; Activity coefficient

There are two kinds of refrigeration oil as is called mineral oil and synthetic oil. First of all, a survey has been done concerning the previous investigations on thermophysical properties of mixtures which consist of chlorofluorocarbons and refrigeration oil. The present survey reveals that (1) only a few reliable data of thermophysical properties for such kinds of mixtures are published and (b) most of the studies do not deal with the mixture whose oil component is a synthetic oil. Then, an alkyl benzene base synthetic oil has been selected as an oil component, and R 12(CCl_2F_2) and R 22(CHClF_2) as a refrigerant component. Measurements of vapor pressure, which is one of the most important thermodynamic properties, have been carried out and the following are the results obtained in the present study.(1) Fifty four vapor pressure data for the R 12/synthetic oil system have been measured in the range of temperatures from 283.15 K to 333.15 K, pressures up to 1.5 MPa, and mass fractions of R 12 in liquid phase from 0.26 to 1. (2) Fifty four vapor pressure data for the R 22/synthetic oil system have been obtained in the range of temperatures from 283.15 K to 333.15 K, pressures up to 2.4 MPa, and mass fractions of R 22 in liquid phase from 0.17 to 1. (3) The vapor pressure data for both systems have been correlated as a function of temperature and mass fraction of refrigerant in liquid phase. (4) The activity coefficients for the two systems, both of which are regarded as a mixture that contains highly volatile refrigerant and very low volatile refrigeration oil, have been calculated with the aid of an available theory on vapor-liquid equilibrium using the experimental data. (5) The comparison of the present data with those of other investigators shows that the composition dependence of vapor pressure is quite different from oil to oil, particularly in some region of oil rich concentration.

冷冻机油分为矿物油和合成油两种。首先，综述了国内外对含氯氟烃和冷冻机油混合物热物理性质的研究。目前的调查表明，（1）只有少数几个可靠的数据，这类混合物的热物理性质的出版物和（B）大多数的研究没有涉及的混合物的油组分是合成油。然后，选择烷基苯基合成油作为油组分，R12（CCl_2F_2）和R22（CHClF_2）作为制冷剂组分。蒸汽压是最重要的热力学性质之一，已经进行了测量，以下是本研究中获得的结果。(1)在温度为283.15 ~ 333.15K、压力为1.5MPa、液相中R12质量分数为0.26 ~ 1的范围内，测定了54个R12/合成油体系的蒸气压数据。(2)在温度283.15 ~ 333.15K、压力2.4MPa、液相中R22质量分数0.17 ~ 1的范围内，获得了54个R22/合成油体系的蒸气压数据。(3)这两个系统的蒸汽压数据已被关联为温度和液相中的制冷剂的质量分数的函数。(4)这两个系统的活度系数，这两个系统都被视为一个混合物，含有高挥发性制冷剂和极低挥发性冷冻机油，已计算与现有的汽液平衡理论的帮助下，使用实验数据。(5)与其他研究者的数据的比较表明，蒸汽压的组成依赖性是相当不同的石油，特别是在某些地区的富油浓度。