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← TechnologyWhich outcome occurs when a refrigeration system's defrost cycle overheats?
A)Refrigerant phase changes prematurely
B)Evaporator coil experiences thermal stress✓
C)Compressor runs at constant speed
D)Condenser subcooling excessively increases
💡 Explanation
Excessive heat during defrost causes the evaporator coil to expand and contract rapidly—a process called thermal stress. Because this repeated expansion/contraction exceeds material limits, cracking is probable; therefore, the coil fails, rather than refrigerant phase change altering significantly.
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