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. O = 400 kW loss State 3: P2=1.4 MPa T2= 180°C State 1: P1=1.4 MPa m, = 5 kg / s %3D T= 50°C Feed Water Heater State 2: P2=1.4 MPa T2= 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. O = 400 kW loss State 3: P2=1.4 MPa T2= 180°C State 1: P1=1.4 MPa m, = 5 kg / s %3D T= 50°C Feed Water Heater State 2: P2=1.4 MPa T2= 300°C
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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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.
O = 400 kW
loss
State 3: P2=1.4 MPa
T2= 180°C
State 1: P1=1.4 MPa
m, = 5 kg / s
%3D
T= 50°C
Feed Water
Heater
State 2: P2=1.4 MPa
T2= 300°C
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