Combustion gases at T [infinity] , 1 = 2500°C are separated from a liquid coolant at T [infinity] , 2 = 150°C by a composite wall composed of a L A = 15-mm thick layer of beryllium oxide on the gas side and a L B = 22-mm thick slab of stainless steel (AISI 304) on the liquid side. If the contact resistance between the oxide and steel is R t , c = 0.03 m2·K/W, find the rate of heat loss per unit surface area of the composite wall. The gas convective coefficient is h 1 = 75 W/m2·K while on the liquid side is h 2 = 1000 W/m2·K.

Consider a power plant with water as the working fluid that operates on an ideal rankine cycle. it has a net power output of 45mw. superheated steam enters the turbine at 7mpa and 500°c (h=3411.4 kj/kg; s=6.8 kj/kg k) and is cooled in the condenser at a pressure of 10 kpa by running cooling water from a lake through the tubes of the condenser at a rate of 2000 kg/s. (a) show the cycle on a t-s diagram (a right schematic is fine - you do not need to calculate the temperatures at each point); (b)-determine the work done by the turbine and the pump in kj/kg; (c)-the mass flow rate of water used by the power plant; (d)-the thermal efficiency of the cycle; (e)-the temperature rise of the cooling water. assume the cooling water is incompressible with cp 4.18 kj/kg°c.