Answered: 600 °C Boiler 10 MPa Turbine W, 1.5 MPa…

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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Question

A feed water heater is used to preheat water before it enters a boiler, as shown schematically
in Figure Q1. A mass flux of 30 kg/s flows through the system and, 7 kg/s is withdrawn
from the turbine for the feed water heater. Neglecting losses through the various pipes and
components determine
(a) the feed water heater outlet temperature,
(b) the boiler heat transfer rate,
(c) the turbine power output,
(d) the total pump power required,
(e) the energy rejected by the condenser,
(f) the cooling water mass flux, and
(g) the thermal efficiency of the cycle.

1. A feed water heater is used to preheat water before it enters a boiler, as shown schematically
in Figure Q1. A mass flux of 30 kg/s flows through the system and, 7 kg/s is withdrawn
from the turbine for the feed water heater. Neglecting losses through the various pipes and
components determine
(a) the feed water heater outlet temperature,
(b) the boiler heat transfer rate,
(c) the turbine power output,
(d) the total pump power required,
(e) the energy rejected by the condenser,
(f) the cooling water mass flux, and
(g) the thermal efficiency of the cycle.
600 °C
Boiler
10 MPа
Turbine
W.
1.5 MPa
300 °C
10 MPa
Feedwater
x = 0.95
20 kPa
heater
1.5 MPa
40 °C
1.5 MPa
20 kPa
Pump
Pump
Condenser
JT = 25 °C
40 °C
Cooling water
Figure Q1

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