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MISCIBILITY, SOLUBILITY, VISCOSITY, AND DENSITY MEASUREMENTS FOR R-236EA WITH FOUR DIFFERENT EXXON LUBRICANTS
Citation:
Kang, H. AND M. Pate. MISCIBILITY, SOLUBILITY, VISCOSITY, AND DENSITY MEASUREMENTS FOR R-236EA WITH FOUR DIFFERENT EXXON LUBRICANTS. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-99/052 (NTIS PB99-150302), 1999.
Description:
The report discusses miscibility, solubility, viscosity, and density data for the refrigerant hydrofluorocarbon (HFC)-236ea (or R-236ea) and four lubricants supplied by Exxon Corporation. Such data are needed to determine the suitability of refrigerant/lubricant combinations for use in refrigeration systems. The miscibility tests were performed in a test facility consisting of a series of miniature test cells submerged in a constant temperature bath, precisely controlled over a range of -50 to 90 degrees C. The test cells were constructed to allow for complete visibility of refrigerant/lubricant mixtures under all test conditions. Critical solution temperatures obtained from the miscibility data are presented for each refrigerant/lubricant combination. Data for the R-236ea in each of the test lubricants have been collected for refrigerant concentrations of 10-90%. The raw data have been presented, and the results summarized. Two of the oils (Exxon-03 and -04) were found to be completely miscible over the temperature and concentration ranges tested, while the other two (Exxon-01 and -02) were found to be immiscible over most of the temperature range tested. Solubility, viscosity, and density data were also obtained for R-236a mixed with the same four oils for a refrigerant concentration range 0-40% wt % refrigerant over a temperature range of 30-100 degrees C.