Answered: P = 2 MPa T = 400°C V = 50 m/s 21 = 10…

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

The power output of an adiabatic steam turbine is 5 MW, and the inlet and the exit conditions of the steam are as indicated in Fig Compare the magnitudes of Δh, Δke, and Δpe.

P = 2 MPa
T = 400°C
V = 50 m/s
21 = 10 m
Steam
turbine
Wout = 5 MW
P:= 15 kPa.
X = 0.90
V2 = 180 m/s
2= 6 m

Expert Solution

Step 1

Given data

$W = 5 MW$

Step 2

from Table A - 16 the enthalpy at inlet is

$h_{1} = 3248.4 KJ / kg$

The enthalpy at state 2 is given by

$h_{2} = h_{f} + x h_{f g}$

Substitute the necessary values in above equation

$\begin{array}{rcl} h_{2} & = & [225.94 + 0.9 (2372.3)] KJ / kg \\ = & 2361.03 KJ / kg \end{array}$

Step 3

Then

$∆ h = h_{2} - h_{1}$

Substitute the necessary values in above equation

$\begin{array}{rcl} ∆ h & = & [2361.01 - 3248.4] KJ / kg \\ = & - 887.4 KJ / kg \end{array}$

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