As a quality assurance engineer, you are required by your constituents to analyzed petrol fuel with the following composition; Carbon 85%, hydrogen 13%, Oxygen 2%. When burning the fuel in a combustion chamber the air supply is 59% in excess of theoretical minimum required for complete combustion, the inlet temperature of the air being 31°C and funnel temperature is 280°C. Determine the calorific/ heating value of fuel, the air-fuel ratio and percentage of heat energy supplied?