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

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 low-pressure
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...

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if the actual expansion process is adiabatic; 8.5% if the ideal
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Steam enters the turbine of an ideal Rankine cycle power plant
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A power plant using an ideal Rankine power generation
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2 kg/s. Heat is supplied to the boiler of 2500 kJ/kg. The
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pressure of 10 MPa. Determine:
the exit temperature of the pump (oC) (3
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the work of the turbine (kW) (3 pts)
the heat exhausted from the condenser (kJ/s) (3
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Superheated vapor enters the turbine at 10 MPa, 520°C, and the
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Determine for the cycle:
(a) the heat addition, in kJ per kg of steam entering the
first-stage turbine.
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