Test 2 solutions

Test 2 solutions - 4-132 A cylinder is initially filled...

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4-132 A cylinder is initially filled with saturated liquid-vapor mixture of R-134a at a specified pressure. Heat is transferred to the cylinder until the refrigerant vaporizes completely at constant pressure. The initial volume, the work done, and the total heat transfer are to be determined, and the process is to be shown on a P- v diagram. Assumptions 1 The cylinder is stationary and thus the kinetic and potential energy changes are negligible. 2 The thermal energy stored in the cylinder itself is negligible. 3 The compression or expansion process is quasi-equilibrium. Analysis ( a ) Using property data from R-134a tables (Tables A-11 through A-13), the initial volume of the refrigerant is determined to be () 3 m 0.006098 = = = = × + = + = = × + = + = = = = = = = /kg m 0.03049 kg 0.2 kJ/kg 143 . 94 21 . 186 0.3 38.28 /kg m 0.03049 0.0007533) (0.099867 0.3 0.0007533 kJ/kg .21 186 , 28 . 38 /kg m 0.099867 , 0007533 . 0 3 . 0 kPa 200 3 1 1 1 1 3 1 1 3 1 1 V m u x u u x u u x P fg f fg f fg f g f ( b ) The work done during this constant pressure process is kJ/kg 224.48 /kg m 0.09987 vapor sat. kPa 200 kPa 200 @ 2 3 kPa 200 @ 2 2 = = = = = g g u u v v P ( ) ( ) kJ 2.78 = = = = = 3 3 1 2 1 2 2 1 out , m kPa 1 kJ 1 /kg m 0.03049 0.09987 kPa 200 kg 0.2 ) ( mP P d P W b ( c ) We take the contents of the cylinder as the system. This is a closed system since no mass enters or
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Test 2 solutions - 4-132 A cylinder is initially filled...

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