Environmental Protection Agency (EPA) MVAC Certification

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Which refrigerant has a low solubility in non-polar lubricants?

HFC-411A
R-134a
R-12
HFC-152A

The correct answer is: R-134a

The choice of R-134a as the refrigerant with low solubility in non-polar lubricants can be attributed to its chemical structure and properties. R-134a, or 1,1,1,2-tetrafluoroethane, is a hydrofluorocarbon (HFC) that has a polar molecular configuration. This polarity contributes to its performance characteristics in refrigeration systems, particularly regarding compatibility with various lubricants used in compressors. On the other hand, non-polar lubricants are typically hydrocarbons that do not interact well with polar substances. Since R-134a is more polar, it does not dissolve well in these non-polar lubricants, which helps to maintain the integrity and functionality of the lubrication system in automotive air conditioning applications. Maintaining a separation between the refrigerant and the lubricant can be vital for ensuring efficient operation and preventing potential issues such as foaming or degradation of the lubricant. While other refrigerants listed might show different solubility characteristics, the distinction of R-134a having a low solubility in non-polar lubricants is supported by its chemical behavior and the nature of interactions between polar and non-polar substances.