# HW17s - Spring 2006 Thermodynamics Homework 17 Solution 1...

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Spring 2006 1 ME 201 Thermodynamics Homework 17 Solution 1. Two kilograms of Refrigerant-134a is contained in a piston-cylinder system. It is initially at 160 kPa and 0 ° C and is compressed to saturated vapor at 0 ° C. The heat transfer from the cylinder is reported to be 30 kJ. Can this value be correct? What is the minimum work input required to carry out this process? Solution: We need to determine whether ( ) Δ S 0 universe holds for this situation. Since we have a closed system we can write this equivalently as ( ) ( ) ( ) ( ) Δ Δ Δ S = S + S 0 = m s -s - Q T 0 universe system surrounds 2 1 sys surr To evaluate this we will need to perform a 1 st law analysis. Setting up our table System: Closed System Fluid: Refrigerant-134a (compressible substance) State 1 State 2 T 1 = 0 ° C T 2 = 0 ° C P 1 = 160 kPa P 2 = 293.01 kPa u 1 = 232.86 kJ/kg u 2 = 230.16 kJ/kg s 1 = 0.9915 kJ/(kg K) s 2 = 0.9314 kJ/(kg K) phase:sup.vap. phase:sat.vap. Italicized

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HW17s - Spring 2006 Thermodynamics Homework 17 Solution 1...

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