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Applying the Entropy Balance: Closed SystemsAn insulated,
Chapter 6, Problem 68P(choose chapter or problem)
An insulated, rigid tank is divided into two compartments by a frictionless, thermally conducting piston. One compartment initially contains \(1 \mathrm{\ m}^{3}\) of saturated water vapor at 4 MPa and the other compartment contains \(1 \mathrm{\ m}^{3}\) of water vapor at 20 MPa, \(800^{\circ} \mathrm{C}\). The piston is released and equilibrium is attained, with the piston experiencing no change of state. For the water as the system, determine
(a) the final pressure, in MPa.
(b) the final temperature, in \({ }^{\circ} \mathrm{C}\).
(c) the amount of entropy produced, in kJ/K.
Questions & Answers
QUESTION:
An insulated, rigid tank is divided into two compartments by a frictionless, thermally conducting piston. One compartment initially contains \(1 \mathrm{\ m}^{3}\) of saturated water vapor at 4 MPa and the other compartment contains \(1 \mathrm{\ m}^{3}\) of water vapor at 20 MPa, \(800^{\circ} \mathrm{C}\). The piston is released and equilibrium is attained, with the piston experiencing no change of state. For the water as the system, determine
(a) the final pressure, in MPa.
(b) the final temperature, in \({ }^{\circ} \mathrm{C}\).
(c) the amount of entropy produced, in kJ/K.
ANSWER:Solution 68P
Step 1 of 5:
In this question, we need to find the final pressure in
In part b, we need to find final temperature in
In part c, we need to find amount of entropy produced in
Data given
Volume of water vapor in compartment 1
Pressure in compartment 1
Volume of water vapor in compartment 2
Pressure in compartment 2
Temperature
Part a and part b: