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← ScienceWhich 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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