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← ScienceWhich outcome occurs in a refrigeration cycle when expansion valve temperature exceeds design threshold?
A)Increased refrigerant superheat at compressor inlet✓
B)Decreased condenser subcooling approaches zero
C)Excessive liquid floodback to compressor occurs
D)Higher compression ratio lowers efficiency index
💡 Explanation
Excessive expansion valve warming allows increased refrigerant flash-off; *isenthalpic expansion* causes higher vapor fraction downstream because liquid refrigerant is not efficiently cooled, therefore superheat increases rather than liquid carryover, with reduced subcooling.
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