How much is the lost work due to the reduced efficiency

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Reference no: EM131156502

Problem 6.11: A steam turbine generates power by expanding steam from 30 bar, 450 °C to 8 bar.

a) Determine the amount of work and the exit temperature if operation is reversible.

b) Repeat the calculation assuming an efficiency of 80%. How much is the lost work due to the reduced efficiency?

Problem 6.12: A thermally insulated turbine generates 750 kW of power by expanding steam from 500 C and 3.5 MPa to 200 C and 0.3 MPa.

a) What is the mass flow rate of steam through the turbine?

b) Because of failure in the insulation there is a loss of 60 kJ per kg of steam. What is the power produced by the turbine if all inlet and outlet conditions remain the same?

Assume negligible kinetic and potential energy changes.

Reference no: EM131156502

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