Which effect occurs within a refrigeration system when incompatible oils mix with the refrigerant?

💡 Explanation

When incompatible oils mix with the refrigerant, oil fouling occurs because the oil's chemical properties impede uniform refrigerant evaporation, reducing heat exchange efficiency. Therefore, reduced heat transfer is the result, rather than efficiency increase, lower superheat, or flow reduction, all requiring optimized oil-refrigerant miscibility.

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