Question
In: Mechanical Engineering
In large steam power plants, the feedwater is frequently heated in closed feedwater heaters (basically heat...
In large steam power plants, the feedwater is frequently heated in closed feedwater heaters (basically heat exchangers) by steam extracted from the turbine at some stage. Steam enters the feedwater heater at 1.5 MPa and 250℃ and leaves as saturated liquid at the same pressure. Feed water enters the heater at 2.5 MPa and 60℃ and leaves at 10℃ below the exit temperature of the steam. Neglecting any heat losses from the outer surfaces of the heater, determine (a) the ratio of the mass flow rates of the extracted steam and the feedwater heater and (b) the total entropy change for this process per unit mass of the feedwater.
Solutions
samet mamat answered 2 years agoRelated Solutions
A steam power plant operates on a regenerative Rankine cycle with two feedwater heaters, one closed...
A steam power plant operates on a regenerative Rankine
cycle with two feedwater heaters, one closed and one open. Steam
enters the turbine at 12.5 MPa and 550ºC and exhausts to the
condenser at 10 kPa. Steam is extracted from the turbine at 1 MPa
for the closed feedwater heater and 0.8 MPa for the open one. The
feedwater is heated to the condensation temperature of the
extracted steam in the closed feedwater heater. The extracted steam
leaves the closed...
4. Consider a reheat–regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and...
4. Consider a reheat–regenerative vapor power cycle with two
feedwater heaters, a closed feedwater heater and an open feedwater
heater. Steam enters the first turbine at 12.0 MPa, 520C and
expands to 0.6 MPa. The steam is reheated to 440C before entering
the second turbine, where it expands to the condenser pressure of
0.006 MPa. Steam is extracted from the first turbine at 2 MPa and
fed to the closed feedwater heater. Feedwater leaves the closed
heater at 200C and...
Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open...
Consider a regenerative vapor power cycle with two feedwater
heaters, a closed one and an open one, and reheat. Steam enters the
first turbine stage at 12 MPa, 560 °C, and expands to 1.5 MPa. Some
steam is extracted at 1.5 MPa and fed to the closed feedwater
heater. The remainder is reheated at 1.5 MPa to 440 °C and then
expands through the second-stage turbine to 0.3 MPa, where an
additional amount is extracted and fed into the open...
Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open...
Consider a regenerative vapor power cycle with two feedwater
heaters, a closed one and an open one, and reheat. Steam enters the
first turbine stage at 12 MPa, 480°C, and expands to 2 MPa. Some
steam is extracted at 2 MPa and fed to the closed feedwater heater.
The remainder is reheated at 2 MPa to 440°C and then expands
through the second-stage turbine to 0.3 MPa, where an additional
amount is extracted and fed into the open feedwater heater...
Problem 8.045 SI Consider a regenerative vapor power cycle with two feedwater heaters, a closed one...
Problem 8.045 SI
Consider a regenerative vapor power cycle with two feedwater
heaters, a closed one and an open one, and reheat. Steam enters the
first turbine stage at 12 MPa, 560°C, and expands to 2 MPa. Some
steam is extracted at 2 MPa and fed to the closed feedwater heater.
The remainder is reheated at 2 MPa to 520°C and then expands
through the second-stage turbine to 0.3 MPa, where an additional
amount is extracted and fed into the...
A steam power plant operates with a boiler that is heated from a heat source at...
A steam power plant operates with a boiler that is heated from a
heat source at 457 °C and produces 450 ton/hr. of steam. The steam
leaves the boiler at 425 °C and 4 MPa. The steam reaches a turbine
at 375 °C and 3 MPa and leaves it at 50 kPa with 4% liquid water.
This mixture is flown into a condenser that rejects the heat into a
river at 17 °C. Water leaves the condenser at 50 kPa...
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...
A power plant operates on a regenerative vapor power cycle with
one open feedwater heater. Steam enters the first turbine stagge at
12 MPa, 560*C and expands to 1 MPa, where some of the steam is
extracted and diverted to the open feedwater heater operating at 1
MPa. The remaining steam expands through the second turbine stage
to the condenser pressure of 6 kPa. Saturated liquid exits the open
feedwater heater at 1 MPa. The net power output for the...
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...
A power plant operates on a regenerative vapor power cycle with
one open feedwater heater. Steam enters the first
turbine stage at 12 MPa, 520◦C and expands to 1 MPa, where some of
the steam is extracted and diverted to the open
feedwater heater at 1 MPa. The remaining steam expands through the
second turbine stage to the condenser pressure of
6 kPa. Saturated liquid exits the open feedwater heater at 1 MPa.
For isentropic processes in the turbines and...
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...
A power plant operates on a regenerative vapor power cycle with
one open feedwater heater. Steam enters the first turbine stage at
12 MPa, 560°C and expands to 1 MPa, where some of the steam is
extracted and diverted to the open feedwater heater operating at 1
MPa. The remaining steam expands through the second turbine stage
to the condenser pressure of 50 kPa. Saturated liquid exits the
open feedwater heater at 1 MPa. The net power output for the...
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...
A power plant operates on a regenerative vapor power cycle with
one open feedwater heater. Steam enters the first turbine stage at
12 MPa, 560°C and expands to 1 MPa, where some of the steam is
extracted and diverted to the open feedwater heater operating at 1
MPa. The remaining steam expands through the second turbine stage
to the condenser pressure of 28 kPa. Saturated liquid exits the
open feedwater heater at 1 MPa. The net power output for the...
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