Q2: A furnace is to be designed for a heat duty of 30106Btu/hr and 75% efficiency. Oil fuel with NHV=17200Btu/lb is to be fired with 17.5lb air/lb fuel. The air enthalpy is 82Btu/lb. Steam at a rate of 0.3lb/lb fuel is used for atomization. The steam enthalpy is 95Btu/lb. The tubes are arranged in two rows and are of 5 outside diameter, 40'length, and 10 spacing. 1500ft2 of projected area is available. The enthalpy of flue gases leaving the stack is 148Btu/lb. Calculate the % heat absorbed in the convection section, assuming 2% losses in the furnace walls for each sertinn