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Steam leaves the boiler of a 100 MW Rankine cycle power plant at 400°C and 3.5MPa....

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Mechanical Engineering

Steam leaves the boiler of a 100 MW Rankine cycle power plant at400°C and 3.5MPa. The Turbine has an isentropic efficiency of 85%and exhausts at 15 kPa. In the condenser, the water is subcooled to38°C by lake water at 13°C. The pump isentropic efficiency is75%.

1. Draw and label the T-s diagram for this cycle

2. Determine the cycle’s thermal efficiency

3. Determine the mass flow rate of the steam in the boiler(kg/h)

4. Determine the back-work ratio

5. Determine the minimum required cooling water flow rate ifregulations limit the cooling water temperature rise to 10°C(kg/h)

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