Propane is to be burned with 15.0% excess air. Before entering the furnace, the air is preheated from 32 F to 575 F. At what rate (Btu/h) must heat be transferred to the air if the feed rate of propane is 1 35 10 SCFH [ft (STP)/h]?
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Answer is 450F because of of the formulae of
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