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mechanical engg

You are required to ‘design’ a fire that will burn for about 10 minutes with a heat output of approximately 750 kW. What diameter of tray, or pan, would you require to contain (a) ethanol and (b) heptane to achieve a fire with these characteristics? Assume that combustion is 100% efficient, and take the heat of combustion of heptane to be 45 MJ/kg. (Hint: first try estimating the tray diameter assuming the limiting rates of burning.)

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