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Which outcome occurs when a refrigeration system's evaporator coil operates consistently below freezing?

A)Refrigerant subcooling decreases superheat load
B)System efficiency drops over extended runs
C)Compressor maintains constant design pressure
D)Increased oil return protects scroll chambers

💡 Explanation

System efficiency decreases because ice buildup, an unwanted phase transition, insulates the coil, reducing effective heat transfer via conduction; therefore, the system delivers less cooling per unit energy because heat flows less efficiently rather than maintaining peak effectiveness.

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