Feed water heaters are used to preheat water before entering the boiler of a steam power plant by mixing cold water with steam bled from some middle stages of the turbine. The feed water heater shown in the figure is assumed steady-flow. The device is not fully insulated, and 400 kW heat is rejected to the environment at the temperature of 27°C during the process. Calculate the rate of total entropy generation for the system. States at inlets and outlet of the feed water are specified in the figure. %3D Zloss = 400kW State 3: P2=1.4 MPa T= 180°C State 1: P=1.4 MPa T= 50°C m, = 5 kg / s Feed Water Heater State 2: P=1.4 MPa T= 300°C
Feed water heaters are used to preheat water before entering the boiler of a steam power plant by mixing cold water with steam bled from some middle stages of the turbine. The feed water heater shown in the figure is assumed steady-flow. The device is not fully insulated, and 400 kW heat is rejected to the environment at the temperature of 27°C during the process. Calculate the rate of total entropy generation for the system. States at inlets and outlet of the feed water are specified in the figure. %3D Zloss = 400kW State 3: P2=1.4 MPa T= 180°C State 1: P=1.4 MPa T= 50°C m, = 5 kg / s Feed Water Heater State 2: P=1.4 MPa T= 300°C
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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Transcribed Image Text:Feed water heaters are used to preheat water before entering the boiler of a steam power plant by mixing
cold water with steam bled from some middle stages of the turbine. The feed water heater shown in the
figure is assumed steady-flow. The device is not fully insulated, and 400 kW heat is rejected to the
environment at the temperature of 27°C during the process. Calculate the rate of total entropy generation
for the system. States at inlets and outlet of the feed water are specified in the figure.
%3D
Zloss
= 400kW
State 3: P2=1.4 MPa
T= 180°C
State 1: P=1.4 MPa
T= 50°C
m, = 5 kg / s
Feed Water
Heater
State 2: P=1.4 MPa
T= 300°C
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