Refrigerant-134a enters a diffuser steadily as satu-rated vapor at 600 kpa with a velocity of 160 m/s, and it leaves at 700 kpa and 40°c. the refrigerant is gaining heat at a rate of 2 kj/s as it passes through the diffuser. if the exit area is 80 percent greater than the inlet area, determine (a) the exit velocity and (b) the mass flow rate of the refrigerant