(a)
Interpretation:
Calculate the lost work of given process in
Concept Introduction:
The lost work of any process is calculated by following formula:
(a)
Answer to Problem 5.49P
Explanation of Solution
Given information:
The process is given as a flue gas is cooled from
The heat capacity of flue gas is given as,
Latent heat of vaporization of water to generate steam is given as
For rate of entropy generation, the total entropy generation in boiler is the sum of the entropy generation during the heating of water in order to generate steam and entropy generation during the cooling of gas which are find out by entropy balance of the open system equation.
Entropy generation during cooling of gas is
The entropy change of gas is
And
Entropy generation during vaporization of water is
The entropy change of water is
Now for the calculations of mass and molar flow rates, applying the steady state energy balance across the boiler
Hence
Hence the lost work in
(b)
Interpretation:
Calculate the maximum work of given process in
Concept Introduction:
The maximum work of any process is ideal work and calculated by following formula:
....(1)
(b)
Answer to Problem 5.49P
Explanation of Solution
Given information:
Latent heat of vaporization of water to generate steam is given as
The maximum work of flue gas if it condenses only and does not subcoolis same as ideal work done by water to vaporize. Hence
And
From the part (a), we found that
Hence
The maximum work in terms of
From the part (a), we found that
Hence
(c)
Interpretation:
Compare the results of part (b) with the theoretical value of maximum work done by flue gas itself.
Concept Introduction:
The maximum work of any process is ideal work and calculated by following formula:
....(1)
(c)
Answer to Problem 5.49P
Explanation of Solution
The maximum work of flue gas is same as ideal work done by flue gas. Hence
From the part (a), we found that
Hence
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Chapter 5 Solutions
Introduction to Chemical Engineering Thermodynamics
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