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2. A furnace uses preheated air to improve its fuel efficiency. Determine the AFT when the furnace is operating as a mass air-fuel ratio of A/F = 16 for air preheated to 600 K. The fuel enters at 300 K. Assume the following Tref =300 K, MWfue=MWair=MWproducts = 29 kg/kmol, Cp,fuel = Cp,air=Cp, products = 1200 J/kg-K, = 0,, , fuel = 4x10? J/kg. hair = h .products = Ans. AFT = 2543 K