Question
In: Mechanical Engineering
A Rankine cycle with reheat produces 1 MW of net power. The boiler operates at 15...
A Rankine cycle with reheat produces 1 MW of net power. The boiler operates at 15 MPa and has an outlet temperature of 800 K. The condenser operates at atmospheric pressure (1 atm). The operating point of this cycle is such that the water exiting the low pressure turbine has no liquid present to prevent damageto the turbine (hint: what does this say about quality at this point?). Assume the pump and second turbine stage are both isentropic, but the first turbine stage has an isentropic efficiency of 90%. Assume the steam is reheated at a pressure of 1 MPa.
Find:
(A)The mass flow rate of steam through the turbines
(B)The required heat input
(C)The required flow rate of fuel given a heating value of 50 MJ/kg
(D)Plot the state points on a T-s diagram with lines of constant pressure at the boiler,reheat, and condenser pressures.
Solutions
samet mamat answered 2 years agoRelated Solutions
Consider a steam power plant that operates on a reheat Rankine cycle and has a net...
Consider a steam power plant that operates on a reheat Rankine
cycle and has a net power output of 80 MW. Steam enters the
high-pressure turbine at 10 MPa and 500°C and the low-pressure
turbine at 1 MPa and 500°C. Steam leaves the condenser as a
saturated liquid at a pressure of 10 kPa. The isentropic efficiency
of the turbine is 78 percent and that of the pump is 95
percent.
a.)Determine the quality (or temperature, if superheated) of the...
Consider a steam power plant that operates on a reheat Rankine cycle and has a net...
Consider a steam power plant that operates on a reheat Rankine
cycle and has a net power output of 80 MW.
Steam enters the high-pressure turbine at 10 MPa and 500°C and the
low-pressure turbine at 1 MPa and 500°C. Steam leaves the condenser
as a saturated liquid at a pressure of 10 kPa. The isentropic
efficiency of the turbine is 80 percent, and that of the pump is 95
percent. Show the cycle on a T-s diagram with respect...
Consider a steam power plant that operates on a reheat Rankine cycle and has a net...
Consider a steam power plant that operates on a reheat Rankine
cycle and has a net power output of 80 MW. Steam enters the
high-pressure turbine at 10 MPa and 500°C and the low-pressure
turbine at 1 MPa and 500°C. Steam leaves the condenser as a
saturated liquid at a pressure of 10 kPa. The isentropic efficiency
of the turbine is 76 percent and that of the pump is 95
percent.
A: Determine the quality (or temperature, if superheated) of...
Steam leaves the boiler of a 100 MW Rankine cycle power plant at 400°C and 3.5MPa....
Steam leaves the boiler of a 100 MW Rankine cycle power plant at
400°C and 3.5MPa. The Turbine has an isentropic efficiency of 85%
and exhausts at 15 kPa. In the condenser, the water is subcooled to
38°C by lake water at 13°C. The pump isentropic efficiency is 75%
Draw and label the T-s diagram (4 points) for this cycle and
determine: 1. The cycle’s thermal efficiency (7 points) 2. The mass
flow rate of the steam in the boiler...
Steam leaves the boiler of a 100 MW Rankine cycle power plant at 400°C and 3.5MPa....
Steam leaves the boiler of a 100 MW Rankine cycle power plant at
400°C and 3.5MPa. The Turbine has an isentropic efficiency of 85%
and exhausts at 15 kPa. In the condenser, the water is subcooled to
38°C by lake water at 13°C. The pump isentropic efficiency is
75%.
1. Draw and label the T-s diagram for this cycle
2. Determine the cycle’s thermal efficiency
3. Determine the mass flow rate of the steam in the boiler
(kg/h)
4. Determine...
An ideal Rankine cycle operates between the pressure limits of 15 MPa in the boiler and...
An ideal Rankine cycle operates between the pressure limits of
15 MPa in the boiler and 50 kPa in the condenser. The boiler
generates steam at a mass flow rate of 50 kg/s and it enters the
turbine at a temperature of 1100 °C. a) Calculate the net output of
the cycle b) Calculate the thermal efficiency of the cycle.
Rankine cycle operates on boiler pressure 15 MPa and condenser pressure of 30 kPa. Superheated steam...
Rankine cycle operates on boiler pressure 15 MPa and condenser
pressure of 30 kPa. Superheated steam enters the high-pressure
turbine at 450°C. The high-pressure turbine expands the steam and
enters the re-heater at 2.5 MPa. The steam is reheated until
temperature reaches 450°C before being expanded in low-pressure
turbine to condenser pressure of 30 kPa. Assume the isentropic
efficiency of the low-pressure and high-pressure turbines are 94%
and 89% respectively, and pump is working isentropically. Neglect
the change in kinetic...
Ideal Reheat Steam Cycle (10) Consider a steam power plant operating on the ideal reheat Rankine...
Ideal Reheat Steam Cycle (10)
Consider a steam power plant operating on the ideal
reheat Rankine cycle. Steam enters the high-pressure turbine at PH
MPa and TH °C and is condensed in the condenser at a pressure of PL
kPa. Assume the steam is reheated to the inlet temperature of the
high-pressure turbine, and that pump work is NOT negligible. If the
moisture content of the steam at the exit of the low-pressure
turbine is not to exceed w% percent,...
A Rankine power cycle with reheat uses water as the working fluid. The inlet conditions of...
A Rankine power cycle with reheat uses water as the working
fluid. The inlet conditions of the
first stage turbine are 14MPa and 600oC. All the turbines are known
to have isentropic
efficiency of 85%, however the pump is assumed as an isentropic
pump. If the maximum
temperature is kept at 600oC and the condenser pressure is 6 kPa,
by constructing a suitable
plot, show that having more than 2 reheat stages is not practical.
(Hint: Take at least three...
A steam Rankine cycle operates between the pressure limits of 1500 psia in the boiler and...
A steam Rankine cycle operates between the pressure limits of
1500 psia in the boiler and 1 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. Calculate the mass flow rate through the
boiler, the power produced by the turbine, the rate of heat supply
in the boiler, and the thermal efficiency. Use steam tables
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