Anatural gas fuel consists of the following volumetric composition: methane, ch4: 92.5 % ethane, c2h6: 3.7 % propane, c3h8: 0.8 % nitrogen, n2: 3 % (a) write out the complete combustion equations for all the combustible constituents individually. (b) calculate the stoichiometric air to fuel (a/f) ratio on a volume basis. (c) determine the wet volumetric analysis of the combustion products. (d) find the dry volumetric analysis of the combustion products.

An air-conditioning system consists of a heating section and an evaporative cooler. air enters the heating section at 10°c and 70 percent relative humidity at a rate of 30m^3/min, and it leaves the evaporative cooler at 20°c and 60 percent relatively humidity. if the air conditioning system operates at a total pressure of 98 kpa, determine (a) the temperature and relative humidity of the air when it leaves the heating section, (b) the rate of heat transfer in the heating section, and (c) the rate of water added to air in the evaporative cooler