Apiston-cylinder device contains refrigerant at saturated liquid initially at a temperature of 100°c. during an internally reversible, isothermal-expansion process, the heat transfers from the thermal reservoir to the r134-a is 2000 kj/kg. assumed that potential and kinetic energy of the system are neglected i. find the work done by the piston device ii. sketch the t-s diagram. ii. recheck all of your answer and indicate the unit appropriately