Refrigerant 134a undergoes a process for which the pressure-volume relation is P?n = constant. The initial and final states of the refrigerant are fixed by P1 = 200 kPa, T1 = -10°C and P2 = 1000 kPa, T2 = 50°C, respectively. (a) Draw a T- v diagram, label the saturated temperature, the specific volumes and the temperatures of both the initial and final states. (b) Determine the work done during this expansion process, in kJ/kg. (c) Calculate the amount of heat that transferred into R-134a, in kJ/kg.