Читать книгу Introduction to Desalination - Fuad Nesf Alasfour - Страница 31

Simple Rankine cycle operates with isentropic expansion and isentropic compressor to produce net power of 1750 kW, and steam boiler operates isobarically at 6 MPa pressure; using fuel oil as a fuel, the combustion of fuel produces heat that is added at a source temperature of 800 K, and the produced steam enters steam turbine at 500 °C and 6 MPa to be expand isentropically to 20 kPa as it leaves steam turbine.

The condenser operates at 20 kPa using seawater cooling water at 4 °C (winter season).

Find:

1 Rate of heat supply in the boiler.

2 Rate of heat rejection in the condenser.

3 Cycle thermal efficiency.

4 Availability at each state (To = 298 K)

5 Exergy destruction in each component assuming heat is added from a source at 800 °C and rejected at 4 °C.

6 Cycle second law efficiency.