Emissions from a gas turbine are typically measured and reported in terms of emissions index (g of pollutant produced/kg of fuel burnt). The presence of these pollutants, in addition to their impact on public health, is to reduce the heat of combustion of the fuel, thus reducing combustor efficiency. Calculate the heat of combustion of n-Heptane (C7H16) for complete combustion and then repeat three more times, once with 1 EI CO, once with 1 EI CH4 (EIHC) and once with 1 EI NO (EINOx) in the products respectively. Use this to determine the reduction in efficiency for 1 EI of each pollutant. Combine this information into an equation for combustor efficiency in the form:

(%) = 100 a*EICO b*EIHC c*EINOx

The NOx term has historically been ignored in reporting gas turbine efficiency. At ground idle conditions on a gas turbine engine, emissions were measured as EICO=30 g/kg, EIHC=1 g/kg, and EINOx=3.5 g/kg. what would the efficiency be with and without the EINOx term? At cruise conditions on a gas turbine engine, EIHC=0, EICO=3 g/kg and EINOx = 14 g/kg. What would the efficiency here be with and without the EINOx term?