Answer to Question #105558 in Mechanical Engineering for abbas

Question

Air and fuel enter a furnace used for home heating. The air has an enthalpy of 320 kJ/kg and the fuel has an enthalpy of 43027 kJ/kg. The gases leaving the furnace has an enthalpy of 616 kJ/kg. There are 17 kgair/kgfuel, water circulated through the wall furnace receiving heat. The hose required 17.02 kW of heat, what is the fuel consumption per day. (41 kg/day)

Answer 1

Here in question it is given the enthalpy of air as h_a=320 KJ/kg and the enthalpy of fuel is

h_f=43027 kJ/kg the gases leaving at an enthalpy of h_m=616 Kj/kg here , for heating air the fuel requirement is so,

Here it is given that hose required heat as 17.02 kW =

Total heat requirement per day by hose will =

Net enthalpy exchange by air to heat the hose = /kg

so, net mass of air consumption per day /day

so net mass of fuel consumption per day = of fuel per day