A steam power plant operates on the ideal reheat Rankine cycle. The plant maintains the boiler at 15000 kPa, the reheat section at 800 kPa, and the condenser at 10 kPa. The temperatures at the inlet of the high-pressure and low-pressure turbines are 600°C and 450°C respectively. The adiabatic efficiency of both turbines and of the pump is 80%. The state at the inlet of pump is saturated liquid.
Determine:
a) sketch the evolution in the T-s diagram using the numbering in the Figure.
b) the enthalpy at the exit of the low-pressure turbine, point 6.
c) explain if the state at point 6 is subcooled, saturated or superheated.
d) without actually calculating it, bracket the temperature at 6.
e) the heat flux per unit mass rejected in the condenser stage.
f) the enthalpy at the inlet of the boiler, point 2.
g) explain if the state at point 2 is subcooled, saturated or superheated.
h) heat flux per unit mass supplied to the water flow in the high-pressure boiler stage.