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Which limitation arises when designing closed Rankine cycle power plants using fluids near their critical point?

A)Turbine blade erosion becomes more widespread
B)Isentropic efficiencies plummet catastrophically.
C)Controllability of superheated vapor vanishes entirely.
D)Heat transfer coefficients severely decline.

💡 Explanation

Near the critical point, small temperature changes drastically alter fluid density and phase, causing large fluctuations; therefore isentropic efficiencies are impacted because consistent turbine energy extraction is almost impossible due to variable fluid properties, rather than mere heat transfer declines.

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