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Evaluate the proportion of the heat of fuel carried away by the flue gases for the...

Evaluate the proportion of the heat of fuel carried away by the flue gases for the following data: Coal with Calorific Value of 30 MJ/kg has composition by mass as follow: C= 78%, H=5%, 0,=8%, S=2%, N2=2% and the remaining is ash. The coal is burnt in the furnace with 50% excess air. The flue gases leaving the chimney at 327°C and the atmospheric temperature is at 15 °C. Assume perfect combustion. Specific heat for dry product (Cp) is 1045J/kg. Heat is carried away per kilogram of moisture in the flue gas is 3000kJ/kg. The composition of air by mass is as follow: 02 = 23% and N2= 77 %.
(20 marks, C5)

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