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GATE ME 2016 Set 1 — Question 57

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NAT+2 / -0MediumRankine, Reheat & RegenerativePower CyclesThermodynamics

Thermodynamics → Power Cycles → Rankine, Reheat & Regenerative

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Question

In a steam power plant operating on an ideal Rankine cycle, superheated steam enters the turbine at 3 MPa and 350 ∘^\circ C. The condenser pressure is 75 kPa. The thermal efficiency of the cycle is ________ percent.
Given data:
For saturated liquid, at P=75 kPaP = 75 \text{ kPa}, hf≅384.39 kJ/kgh_f \cong 384.39 \text{ kJ/kg}, vf≅0.001037 m3/kgv_f \cong 0.001037 \text{ m}^3/\text{kg}, sf=1.213 kJ/kg-Ks_f = 1.213 \text{ kJ/kg-K}
At 75 kPa, hfg=2278.6 kJ/kgh_{fg} = 2278.6 \text{ kJ/kg}, sfg=6.2434 kJ/kg-Ks_{fg} = 6.2434 \text{ kJ/kg-K}
At P=3 MPaP = 3 \text{ MPa} and T=350 ∘CT = 350 \text{ }^\circ\text{C} (superheated steam), h≅3115.3 kJ/kgh \cong 3115.3 \text{ kJ/kg}, s≅6.7428 kJ/kg-Ks \cong 6.7428 \text{ kJ/kg-K}
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