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← ScienceWhich limitation results when a vapor-compression refrigerator uses R-134a near its thermodynamic critical point?
A)Isentropic efficiency decreases significantly
B)Compressor work input rises sharply
C)Latent heat of vaporization vanishes✓
D)Volumetric cooling capacity reduces negligibly
💡 Explanation
The latent heat of vaporization diminishes because near the critical point, liquid and vapor phases become indistinguishable, meaning the enthalpy change is reduced. Therefore, the vaporisation slows, rather than affecting efficiency or work, and it reduces capacity.
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