Aboiler is capable of generating 8 kg steam per kg of fuel at 400 °c. feed water is supplied at pressure of 30 bar, 40 °c and leaves economiser at 150°c for entering to evaporator. steam leaves evaporator with dryness fraction of 0.98 and enters the superheater. fuel used has calorific value of 29000 kj/kg. considering no pressure loss inside the boiler determine boiler efficiency and fraction of heat given to steam in each section of boiler.

Consider a 1.2 meter high and 2 meter wide glass window whose thickness is 6 mm and thermal conductivity is 0.78 w/m °c. the room temperature is maintained at 24 °c, while the outdoor temperature is -5 °c. the convective heat transfer coefficients on the inner and outer surfaces of the window are 10 w/m2 °c and 25 w/m2 °c respectively. (a) draw the thermal resistance network, etermine the steady rate of heat transfer t e glass window (c) determine the temperature of the inner surface of the window