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← TechnologyWhich outcome occurs when refrigerant in a transcritical CO2 heat pump nears its critical point during hot weather?
A)Compressor discharge pressures sharply increase✓
B)Evaporator coil ices up significantly
C)System efficiency will slightly improve
D)Oil viscosity catastrophically decreases
💡 Explanation
High ambient temperature forces the CO2 refrigerant close to its critical point, boosting the discharge pressure via the principle of Vapor Compression Refrigeration. Because of this high heat rejection requirement, the compressor discharge pressures sharply increase, rather than decreasing efficiency or causing icing to occur at the evaporator.
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