Asteam turbine has isentropic efficiency of 0.8. isentropically, it is supposed to deliver work of 100 kw. what is the actual work delivered by the turbine? a heat pump has a cop of 2.2. it takes 5 kw electric power. what is the heat delivery rate to the room being heated in kw? heat pump is used for winter heating of a room. a refrigerator takes 5 kw electric power. it extracts 3 kw of heat from the space being cooled a. what is the heat delivery rate to the surroundings in kw? b. what is the cop of the refrigerator?

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.