The system presented here is a vapour power cycle with reheat and regeneration with both a closed and open feedwater helaters. The steam generator produces vapour at 12.5 MPa, 480°C. Some of the steam expands through the first stage turbine to 2000 kPa. Some steam is extracted at 2000 kPa and fed to the closed feedwater heater, while the remainder passes (at point 3) to be reheated at 2000 kPa to 440°C and expanded in the second stage turbine to 300 kPa where an amount is extracted to the open feedwater heater at 300 kPa. The remainder of the steam is expanded through the third stage turbine and exits at the pressure of the condenser at 7.5 kPa. Feedwater leaves the closed feedwater heater at 205°C and 12.5 MPa while condensates exits as saturated liquid at 2 MPa before being trapped into the open feedwater heater. Saturated liquid water at 0.3 MPa leaves the open feedwater heater. Assume that all pumps and turbines are operating isentropically. T440C Sa peratorSo t- Condenser 0.0075MP. Closed heater Open heater 03 MP -205°C: 20 MP Trap Determine (a) rate of heat transfer to the working fluid passing through the steam generator in kJ per kg of steam entering the first stage turbine; (b) the thermal efficiency of the cycle; (c) the rate of heat transfer from the working fluid passing through the condenser in kj per kg of steam entering the first stage turbine; and (d) draw the cycle's corresponding T-s diagram.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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he system presented here is a vapour power cycle with reheat and regeneration with both a closed and open feedwater heaters. The steam generator produces vapour at 12.5 MPa, 480°C. Some of the steam expands through the first stage turbine to 2000 kPa. Some steam is extracted at 2000 kPa and fed to the closed feedwater heater, while the remainder passes (at point 3) to be reheated at 2000 kPa to 440°C and expanded in the second stage turbine to 300 kPa where an amount is extracted to the open feedwater heater at 300 kPa. The remainder of the steam is expanded through the third stage turbine and exits at the pressure of the condenser at 7.5 kPa. Feedwater leaves the closed feedwater heater at 205°C and 12.5 MPa while condensates exits as saturated liquid at 2 MPa before being trapped into the open feedwater heater. Saturated liquid water at 0.3 MPa leaves the open feedwater heater. Assume that all pumps and turbines are operating isentropically.

Determine (a) rate of heat transfer to the working fluid passing through the steam generator in kJ per kg of steam entering the first stage turbine; (b) the thermal efficiency of the cycle; (c) the rate of heat transfer from the working fluid passing through the condenser in kJ per kg of steam entering the first stage turbine; and (d) draw the cycle’s corresponding T-s diagram.

The system presented here is a
vapour power cycle with reheat
and regeneration with both a
closed and open feedwater
helaters. The steam generator
produces vapour at 12.5 MPa,
480°C. Some of the steam
expands through the first stage
turbine to 2000 kPa. Some
steam is extracted at 2000 kPa
and fed to the closed feedwater
heater, while the remainder
passes (at point 3) to be
reheated at 2000 kPa to 440°C
and expanded in the second
stage turbine to 300 kPa where
an amount is extracted to the
open feedwater heater at 300
kPa. The remainder of the
steam is expanded through the third stage turbine and exits at the pressure of the condenser at 7.5
kPa. Feedwater leaves the closed feedwater heater at 205°C and 12.5 MPa while condensates
exits as saturated liquid at 2 MPa before being trapped into the open feedwater heater. Saturated
liquid water at 0.3 MPa leaves the open feedwater heater. Assume that all pumps and turbines are
operating isentropically.
T440'C
generator
(1-y)
(1)
T,=480°C
Condenser
0 0075MPa
Closed
heater
Open
03 MPa
T-205C 20 MP
12
Pump I
Trap
Determine (a) rate of heat transfer to the working fluid passing through the steam generator in kJ
per kg of steam entering the first stage turbine; (b) the thermal efficiency of the cycle; (c) the rate of
heat transfer from the working fluid passing through the condenser in kJ per kg of steam entering
the first stage turbine; and (d) draw the cycle's corresponding T-s diagram.

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