Which restriction increases the probability of oil dilution in an industrial ammonia refrigeration system?

💡 Explanation

When there is insufficient superheat leaving the evaporator, liquid refrigerant floods back to the compressor, washing oil off the cylinder walls and diluting the crankcase oil because ammonia has high miscibility with typical refrigeration oils. Therefore, insufficient superheat increases oil dilution, rather than excess subcooling, oversized tank, or improper valve which affect system efficiency primarily.

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