Natural gas, we assume methane, is burned with 200% theoretical air, shown in Fig. P13.75, and the reactants are supplied as gases at the reference temperature and pressure. The products are flowing through a heat exchanger, where they give off energy to some water flowing in at 20◦C, 500 kPa, and out at 700◦C, 500 kPa. The products exit at 400 K to the chimney. How much energy per k mole fuel can the products deliver, and how many kilograms of water per kilogram of fuel can they heat?

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H20 H20 teee zel Air Chimney Fuel FIGURE P13.75