Apump supplies 2kg/s of water at 20 bar and 40°c to a boiler. the boiler adds heat at a rate of 5713kw to the water (you may assume that this is a constant pressure process). steam from the boiler passes through a steam turbine and exits at 10kpa, 60°c. (i) calculate the enthalpy rise of the water as it passes through the boiler. (ii) determine the approximate temperature of the steam as it leaves the boiler. (iii) what state is the steam leaving the steam turbine? (iv) calculate the entropy change in the steam as it passes through the turbine.

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.