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

💡 Explanation

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