Which outcome occurs when a screw pump in a refrigerant system operates with excessive superheat at suction?

💡 Explanation

When a screw pump operates with excessive superheat, the refrigerant vapor density decreases because superheating raises the vapor's temperature and thus its specific volume, leading to a lower density. Therefore compressor overheats due to the increased volumetric flow demand at decreased density, rather than backflow, reduced flow or oil foaming which require either seal failures, cavitation, or liquid floodback respectively.

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