Translated Abstract
It is reported in previous studies that the CFC and HCFC refrigerants could damage the ozone layer and cause serious environmental problems. As the HFC refrigerants are ozone friendly and have excellent cooling performances, they have become a popular choice of alternative refrigerants. However, there are some central problems that should be fixed, among which solubility characteirstics between HCFC refrigerants and lubricating oils are commonly mentioned. It is of high importance to have a research on the solubility between HCFC refrigerants and lubricating oils, which affects the safety and robustness of the system. Therefore, when an alternative refrigerant is chosed in a refrigerating system, the solubility between the refrigerant and the lubricant oil should also be tested. The main content in this dissertation was to design a set of solubility experiment apparatus with external circulation, and to measure the critical solubility temperatures between the three refrigerants (R134a, R407C, R410A and R32) and the two lubricants (DRS100 and DRS150).One experimental apparture was designed in this dessertation, which had a external circulation and the advantage of time-saving, accurate temperature measurement, lower requirement on the thermostat bath, better scalability and so on. Compared with the R22 and Shell Clavus 32 mineral oil blends’ results, good greement and system validation were obtained.Critical solubility temperatures of different lubricant mass fraction blends between three kinds of refrigerants R134a, R407C, R410A, R32 and two lubricants DRS100, DRS150 were measured experimentally, and fitted with a least square method, which were summarized in several quadratic curves. These results showed that, to 134a, the solubility with DRS100 and DRS150 was good, with highest critical temperature of -17.1 ℃ and 14.7 ℃ respectively, to R407C, fairly good solubility was observed with DRS100 and DRS150, with highest critical temperature of -5.6 ℃, -1.6 ℃, respectively, to R410A, the solubility with different lubricants became much more complicated. R410A had a fine solubility with DRS100 and the highest critical temperature was 6.9 ℃. When the lubricant mass fraction was from 18.7% to 35.1%, R410A and DRS150 were immiscible, while in other concentration ranges, a good solubility could be obtained. When the lubricant mass fraction was from 8% to 55%, R32 and DRS100 were immiscible.Comparing the measured test results, it was found that in all three refrigerants, the solubility between R134a and DRS100, DRS150 was the best, while R32 was the worst. According to the solubility, both DRS100 and DRS150 lubricants were applicable to R134a and R407C refrigerating system. However, neither of them was suitable for the R32 and R410A refrigerating system.
Translated Keyword
[SolubilityHFCPOEAlternative refrigerants]
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