Concept explainers
(a)
The final temperature of the steam in tank A.
The final temperature of the steam in tank B.
(a)
Answer to Problem 99RP
The final temperature of the steam in tank A is
The final temperature of the steam in tank B is
Explanation of Solution
Write the expression to calculate the specific volume of saturated water
Here, specific volume of saturated liquid is
Write the expression to calculate the specific internal energy of saturated water
Here, specific internal energy of saturated liquid is
Write the expression to calculate the specific entropy of saturated water
Here, specific entropy of saturated liquid is
Write the expression to calculate the mass from the specific volume.
Write the mass balance equation for the fluid flow process.
Here, mass of the steam entered is
Write the energy balance equation for the entire system considering it as a stationary closed system.
Here, net energy input to the system is
Conclusion:
For Tank A:
Refer the Table A-5 of “Saturated water: Pressure”, obtain the properties of steam at the pressure
Substitute
Substitute
Substitute
Refer the Table A-5 of “Saturated water: Pressure”, obtain the properties of steam at the pressure
Thus, the final temperature of the steam in tank A is
Write the final specific entropy of steam in tank A from isentropic relation.
Substitute
Substitute
Substitute
For Tank B:
Refer to Table A-6 of “Superheated water”, obtain the properties of steam for pressure
Substitute
Substitute
Write the expression to calculate the mass flowing into tank B
Substitute
Calculate the final mass of steam in tank B
Substitute
Write the expression to calculate the final specific volume of steam in tank B from Equation (IV).
Substitute
Substitute
From the Table A-4 of “Saturated water: Temperature”, obtain the properties of water in tank B at specific volume of
Thus, the final temperature of the steam in tank B is
(b)
The amount of work potential wasted during the process.
(b)
Answer to Problem 99RP
The amount of work potential wasted during the process is
Explanation of Solution
Write the entropy generation
Here, entropy input to the system is
Write the expression to calculate the exergy destroyed
Here, the surrounding’s temperature is
Conclusion:
Substitute
Substitute
Thus, the amount of work potential wasted during the process is
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Chapter 8 Solutions
Thermodynamics: An Engineering Approach
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