A boiler is required to produce 1 kg/s of saturated steam at atmospheric pressure, with liquid water entering the boiler at 20°C. There are two potential fuels readily available for use: natural gas (modeled as methane) and propane. Assume that the fuel and air would enter the combustor of the boiler at 25°C and atmospheric pressure. Design a combustion process (choose the equivalence ratio and the product exit temperature) that will provide sufficient heat for the boiler. Assume that 95% of the heat released in the combustion process is transferred to the water. Using current prices for natural gas and propane in your area, determine the daily fuel cost for your combustion process (assuming that the process runs 24 hours a day).
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