Which outcome occurs when the oil viscosity decreases in an industrial refrigeration system's screw compressor?

💡 Explanation

Reduced oil viscosity lowers film strength, enabling increased refrigerant leakage across the screw compressor’s rotors via backward flow. This is volumetric inefficiency rather than increased superheat because lubrication failure raises the internal leakage rates in the pump directly rather then influencing the external heat transfer process.

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