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← ScienceWhich efficiency reduction occurs in supercritical Rankine cycles due to deviations from isentropic turbine expansion?
A)Increased condensate subcooling
B)Departure point irreversibilities✓
C)Elevated condenser pressure
D)Decreased feedwater heating
💡 Explanation
Departure point irreversibilities rise as the fluid deviates from ideal gas behavior, leading to reduced turbine output because energy is lost to frictional effects, therefore cycle efficiency drops rather than improvements from adjusted condensation or feedwater parameters.
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