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]?

Propane is to be burned with 15.0% excess air. Before entering the fur

1.	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]?
Answer» ANSWER is 450F because of of the FORMULAE of