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← ScienceWhich 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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