Aphase separator receives 2.5 kg/s of r134a at 0 c with a quality of 60%. saturated liquid exits through the separator bottom at a rate of 1.5 kg/s. saturated vapor exits through the separator top at a rate of 0.25 kg/s. the phase separator is initially filled entirely with 0 c saturated liquid. a) what heat transfer is required to get mixture within the phase separator to 50% quality? report your answer in kj. b) what mass of r134a enters the separator? report your answer in kg.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.