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Which consequence results when supercritical carbon dioxide's enthalpy change vanishes in a turbine?

A)Turbine rotor undergoes plastic deformation
B)Isentropic efficiency severely decreases
C)Lubricant oil flashes into vapor
D)Internal overpressure trips safety valves

💡 Explanation

The isentropic efficiency decreases severely because enthalpy change drives the work extraction. When the Joule-Thomson effect occurs, the fluid doesn't cool effectively during expansion, therefore less work is performed, rather than rotor damage or lubricant failure causing similar performance drops.

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