Question

QUESTION 5
A steam power plant is designed to operate on a reheat Rankine cycle to produce 115 MW
of a net power output. Due to metallurgical limitation, the high-pressure turbine is limited to
operate at maximum pressure and temperature of 15 MPa and 650°C, respectively. The lowpressure
turbine is to operate at maximum pressure and temperature of 3.5 MPa, and
500°C, respectively. Both high and low pressure turbines have maximum isentropic
efficiency of 87 percent. The maximum reheat pressure is limited to maximum low-pressure
turbine. The condenser is set to operate at 15 kPa. The water pump used in this power plant
has a maximum efficiency of 93 percent.
a) Draw the schematic diagram and T−s diagram of this steam power plant. Label all
components in the schematic diagram and each states from the inlet of the pump until
the end of the processes.
b) For this steam power plant, determine the possible maximum thermal efficiency and the
mass flowrate of the steam in the cycle.

Answer 1