Question

A simple ideal Rankine cycle with water as the working fluid operates between the pressure limits of 17.5 MPa in the boiler and 30 kPa in the condenser. What is the minimum temperature required at the turbine inlet such that the quality of the steam leaving the turbine is not below 80%? When operated at this temperature, what is the thermal efficiency of this cycle?

Answer #1

A steam power plant operates on the simple ideal rankine cycle
between the pressure limits of 50 kPa and 20 MPa, with a turbine
inlet temperature of 600 Degree C. Disregarding the pump work,
then:
(a) Show the T-S diagram of the entire cycle.
(b) Solve the total heat (kJ/kg) input for the cycle.
(c) Solve the total heat (kJ/kg) reject by the cycle.
(d) Solve the thermal efficiency of this plant.

Consider a power plant operating on a Rankine cycle
using steam as the
working fluid. The boiler pressure is 2.8 MPa and the steam leaving
the boiler is
superheated to a temperature 110 0C above its saturation
temperature. The condenser
temperature is 49 0C. Condenser discharges saturates liquid. The
efficiency of the
turbine is 0.90 and of the pump 0.8 as compared to reversible and
adiabatic
machines operating at the same pressure ranges.
a) Sketch the cycle on a T-S...

A steam power plant of 15 MW operates on the simple ideal
Rankine cycle such that the water leaves the condenser as a
saturated liquid at a pressure of 15 kPa. The pressure of the water
leaving the pump is 5.0 MPa, and the temperature of the steam
entering the turbine is 650 ºC. (a) Show the sketch and cycle on a
T-s diagram. Determine (b) the thermal efficiency of the cycle and
(c) the mass flow rate in kg/s....

A steam Rankine cycle operates between the pressure limits of
1500 psia in the boiler and 6 psia in the condenser. The turbine
inlet temperature is 800°F. The turbine isentropic efficiency is 90
percent, the pump losses are negligible, and the cycle is sized to
produce 2500 kW of power. How much error is caused in the thermal
efficiency if the power required by the pump were completely
neglected? Use steam tables. The error caused in the thermal
efficiency if...

Consider a 210-MW steam power plant that operates on a simple
ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500°C
and is cooled in the condenser at a pressure of 7.5 kPa.
a.)Determine the quality of the steam at the turbine exit. Use
steam tables.
b.)Determine the thermal efficiency of the cycle.
c.)Determine the mass flow rate of the steam

Consider a 210-MW steam power plant that operates on a simple
ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500°C
and is cooled in the condenser at a pressure of 7.5 kPa. Determine
the quality of the steam at the turbine exit. Use steam tables.
(You must provide an answer before moving on to the next part.)
a.)The quality of the steam at the turbine exit is?
b.)Determine the thermal efficiency of the cycle.The thermal
efficiency of...

In a power plant based on a simple Rankine cycle, steam enters
the turbine at 15 MPa and 900°C. The condenser pressure is 5 kPa.
The turbine operates adiabatically and has an isentropic efficiency
of 85%, and the pump also operates adiabatically and has an
isentropic efficiency of 80%. Determine
the work required to pump the water to the boiler in kJ/kg of
water flowing, and
the enthalpy of the water leaving the pump.

Increasing the temperature of the heat addition (T subscript
H) in any heat engine cycle, with keeping all other parameters
unchanged:
A.
None of the answers.
B.
Decreases the heat added at high temperature.
C.
Increases the thermal efficiency of the cycle.
D.
Decreases the thermal efficiency of the cycle.
1 points
QUESTION 2
The maximum thermal efficiency of the Rankine cycle power
plant is achieved when:
A.
it works on Carnot heat engine cycle.
B.
the pump work...

Water is the working fluid in a Rankine cycle with reheat.
Superheated vapor enters the turbine at 10 MPa, 520°C, and the
condenser pressure is 6 kPa. Steam expands through the first-stage
turbine to 0.7 MPa and then is reheated to 520°C. The pump and each
turbine stage have an isentropic efficiency of 70%.
Determine for the cycle:
(a) the heat addition, in kJ per kg of steam entering the
first-stage turbine.
(b) the percent thermal efficiency.
(c) the magnitude...

Consider a steam power plant which operates on the Rankine
cycle. The pressures in the boiler and the condenser are 5000 kPa
and 40 kPa, respectively. The temperatures at the inlet of the
turbine and at the inlet of the pump are 500oC and 70oC,
respectively. The isentropic efficiency of the turbine is 94
percent, pressure and pump losses are negligible. If the mass flow
rate of steam is 10 kg/s. Determine (a) the heat transfer rate in
the boiler,...

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