Considering Reheat and Supercritical Cycles
Steam at 32 MPa, 520°C enters the first stage of a supercritical reheat cycle including three turbine stages. Steam exiting the first-stage turbine at pressure p is reheated at constant pressure to 440°C, and steam exiting the second-stage turbine at 0.5 MPa is reheated at constant pressure to 360°C. Each turbine stage and the pump has an isentropic efficiency of 85%. The condenser pressure is 8 kPa.
(a) For p = 4 MPa, determine the net work per unit mass of steam flowing, in kJ/kg, and the thermal efficiency.
(b) Plot the quantities of part (a) versus p ranging from 0.5 to 10 MPa.
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