1. A piston-cylinder assembly contains 0.1 lb of propane. The propane expands from an initial state where p1 5 60 lbf/in.2 and T1 5 30°F to a final state where p2 5 10 lbf/in.2 During the process, the pressure and specific volume are related by py2 5constant. Determine the energy transfer by work, in Btu.

Using u-h Data

2. Determine the values of the specified properties at each of the following conditions.

(a) For Refrigerant 134a at T 5 60°C and y 5 0.072 m3/kg, determine p in kPa and h in kJ/kg.

(b) For ammonia at p 5 8 bar and y 5 0.005 m3/kg, determine T in °C and u in  kJ/kg.

(c) For Refrigerant 22 at T 5 210°C and u 5 200 kJ/kg, determine p in bar and y in m3/kg.