Asteam power plant operates between the pressure limit of 3.0 mpa for the boiler and 50 kpa for the condenser. if the plant operates in an ideal rankine cycle with superheated vapor enters the turbine at 3 mpa and 450c, determine: a) the moisture content at the inlet of the condenser, b) the net work per unit mass of steam flowing, in kj/kg, c) the heat transfer to the steam in the boiler in kj per kg of steam, d) the thermal efficiency, e) the heat transfer to cooling water passing through the condenser, in kj per kg of steam flowing.

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.

What is the main objective of using reheat rankine cycle?

Estimate the change in specific internal energy au and specific enthalpy h from inlet to outlet for ethylene glycol (a liquid) flowing through each of the following devices: (a) a heat exchanger where the glycol temperature increases from 20 °c to 80 °c; (b) a pump operating at about 25 °c and increasing the glycol pressure from 100 kpa to 8 mpa.