R-134a enters a water-cooled compressor as saturated vapor at 1 bar with a mass flow rate of 0.9 kg/min. The inlet area is 5 cm^2. The cooling water removes heat at the rate of 140 kJ/min and the compressor requires 3 kW power input. The refrigerant leaves the compressor at a pressure of 8 bar.
(a) Calculate the velocity (m/s) of the refrigerant at the compressor inlet.
(b) Determine the temperature (?C) of the refrigerant at the compressor exit.
(c) Show the compression process on P-v diagram. Label the states, show property values, and indicate appropriate lines of constant temperature.