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Using the Energy BalanceAs shown in Fig. P2.56, a gas

Fundamentals of Engineering Thermodynamics | 7th Edition | ISBN: 9780470495902 | Authors: Michael J. Moran, Howard N. Shapiro, Daisie D. Boettner, Margaret B. Bailey ISBN: 9780470495902 50

Solution for problem 56P Chapter 2

Fundamentals of Engineering Thermodynamics | 7th Edition

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Fundamentals of Engineering Thermodynamics | 7th Edition | ISBN: 9780470495902 | Authors: Michael J. Moran, Howard N. Shapiro, Daisie D. Boettner, Margaret B. Bailey

Fundamentals of Engineering Thermodynamics | 7th Edition

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Problem 56P

Problem 56P

Using the Energy Balance

As shown in Fig. P2.56, a gas contained within a piston-cylinder assembly, initially at a volume of 0.1 m3, undergoes a constant-pressure expansion at 2 bar to a final volume of 0.12 m3, while being slowly heated through the base. The change in internal energy of the gas is 0.25 kJ. The piston and cylinder walls are fabricated from heat-resistant material, and the piston moves smoothly in the cylinder. The local atmospheric pressure is 1 bar.

(a) For the gas as the system, evaluate work and heat transfer, each in kJ.

(b) For the piston as the system, evaluate work and change in potential energy, each in kJ.

Fig. P2.56

Step-by-Step Solution:

(a)

Step 1 of 3

We have to evaluate work and heat transfer for the gas as the system.

The work done for the gas as the system can be evaluated using the expression

where, constant pressure = 2 bar = N/m2

            = change in volume in m3

The change in volume of the gas is

       

         

        

Thus, the work done for the gas as the system is

   

     

     

Step 2 of 3

Chapter 2, Problem 56P is Solved
Step 3 of 3

Textbook: Fundamentals of Engineering Thermodynamics
Edition: 7
Author: Michael J. Moran, Howard N. Shapiro, Daisie D. Boettner, Margaret B. Bailey
ISBN: 9780470495902

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Using the Energy BalanceAs shown in Fig. P2.56, a gas