Question

Thermodynamics

A steam power plant operates with high pressure oft 4 MPa and hasleel receiving heat from a 700°C reservoir. The ambient air at 20°C provides cooling to maintain the water/vapor mixture in the condenser at 60°C. All components are ideal i.e., reversible) except the turbine which has an efficiency 92% of a reversible, isentropic process. Other than the irreversibility of the turbine, the power plant can be considered as a Rankine cycle. Determine the following quantities in the suggested sequence: a) ha and s3 of steam at boiler exit, b) hi at condenser exit, c) s4, xa (quality of stream 4), hs and reversible work done by a turbine assuming it is a reversible process, d) work done by the actual turbine assuming it is a reversible process, e) work done by the pump, h2 and qH, the specific entropy generation in the boiler-heat source - Write the entropy balance equation first.

Answer 1

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