| Project/Area Number |
62550165
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | Kanagawa Institute of Technology |
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Principal Investigator |
OGUCHI Kosei Kanagawa Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (50051602)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAISHI Yoshinori Kanagawa Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (70159250)
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| Project Period (FY) |
1987 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1989: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1988: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1987: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Chlorofluorohydrocarbons / Refrigeration oil / Mixture / Thermodynamic properties / Vapor pressure / Activity coefficient |
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| Research Abstract |
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.
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