(a) Explanation Show the free body diagram of the piston cylinder device and P-v diagram of the process. Write the expression of initial specific volume of a two-phase system for piston-cylinder device. v 1 = v f + x v f g = v f + x ( v g − v f ) (I) Here, the specific volume of saturated liquid for piston-cylinder device is v f , the specific volume of saturated vapour is v g , the specific volume change upon vaporization for piston-cylinder device is v f g , and the quality of final state for piston-cylinder device is x . Write the expression of initial specific internal energy of a two-phase system for piston-cylinder device. u 1 = u f + x u f g (II) Here, the specific internal energy of saturated liquid for piston-cylinder device is u f , the specific internal energy change upon vaporization for piston-cylinder device is u f g , and the quality of final state for piston-cylinder device is x . Determine the initial specific volume of the refrigerant. v 1 = V 1 m V 1 = m v 1 (III) Here, the mass of a saturated refrigerant is m and the initial volume of the refrigerant is V 1 . Conclusion: From the Table (A-11 through A-13), obtain the value of specific volume and internal energy of saturated liquid and vapour for piston-cylinder device. At initial pressure and quality of final state as 200 kPa and 0.25 . v f = 0.0007532 v g = 0.099951 m 3 / kg u f = 38.26 u g = 224.51 kJ / kg u f g = 186.25 kJ / kg Substitute 0 (b) To determine The work done during the process of refrigerant. (c) To determine The total heat transfer during the process of refrigerant.

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ISBN: 9781260048766

Author: CENGEL

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Chapter 4.5, Problem 115RP

(a)

To determine

The initial volume occupied by the refrigerant.

(b)

To determine

The work done during the process of refrigerant.

(c)

To determine

The total heat transfer during the process of refrigerant.

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Chapter 4.5, Problem 114RP

Chapter 4.5, Problem 116RP

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