Aheat pump is used to warm a building in the winter. this system implements an ideal vapor-compression cycle with r-134a as the working fluid. the cycle operates between 140 kpa and 900 kpa, with a mass flow rate of 0.03 kg/s. determine: (a) the heating load that can be met kw. (b) the power input required for this system kw (c) the coefficient of performance (d) the warmest outside temperature at which this particular cycle is unable to operate ∘c

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.