
Concept explainers
a)
The final temperature in each tank A and tank B.
a)

Answer to Problem 199RP
The final temperature in tank A is
The final temperature in tank B is
Explanation of Solution
Write the formula to calculate the specific volume of steam from tables
Here, specific volume of saturated liquid is
Write the formula to calculate the specific internal energy of steam from tables
Here, specific internal energy of saturated liquid is
Write the formula to calculate the specific entropy of steam from tables
Here, specific entropy of saturated liquid is
Write the formula to calculate the mass of the steam
Here, volume of the steam is
Write the expression for the mass balance.
Here, mass of the water entering into the system is
Write the expression for the energy balance Equation for a closed system.
Here, net energy transfer into the control volume is
Conclusion:
From Table A-5, “Saturated water-Pressure table”, obtain the following properties of water at initial pressure
Substitute
Substitute
Substitute
From Table A-5, “Saturated water-Pressure table”, obtain the following properties of water at final pressure
Here, final temperature of steam in tank A is
The steam in tank A undergoes isentropic process, Thus final specific entropy of steam in tank A
Substitute
Substitute
Substitute
From Table A-6, “Superheated water”, note the properties for steam in tank B initially at the pressure of
Substitute
Substitute
Substitute
Rewrite the Equation (V) to calculate the final total mass of steam in tank B
Here, initial mass of steam in tank B is
Substitute
Substitute
Substitute
From first law of thermodynamics, Re-write the Equation (VI) for heat transfer
Here, work done is
Substitute
From Table A-5, “Saturated water-Temperature table”, obtain the following properties of water at
Here, the temperature of the steam in tank at final state is
Thus, the final temperature of steam in tank A is
b)
The entropy generated during the process.
b)

Answer to Problem 199RP
The entropy generated during the process is
Explanation of Solution
Write the expression for the entropy balance Equation of the system.
Here, rate of net entropy in is
Conclusion:
Re-write the Equation (IX) for the entropy generated
Here, temperature of the surroundings is
Substitute
Thus, the entropy generated during this process is
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Chapter 7 Solutions
Thermodynamics: An Engineering Approach
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