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Propane is to be burned with 25.0% excess air. Before entering the furnace, the air is preheated from 32°F to 575°F.(a) At what rate (Btu/h) must heat be transferred to the air if the feed rate of propane is 1:35 x 105SCFH (ft3/h at STP)?(b) The stack gas leaves the furnace at 855°F. How is the air likely to be preheated?

Propane is to be burned with 25.0% excess air. Before entering the furnace, the air is preheated from 32°F to 575°F.(a) At what rate (Btu/h) must heat be transferred to the air if the feed rate of propane is 1:35 x 105SCFH (ft3/h at STP)?(b) The stack gas leaves the furnace at 855°F. How is the air likely to be preheated?

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Propane is to be burned with 25.0% excess air. Before entering the furnace, the air is preheated from 32°F to 575°F.
(a) At what rate (Btu/h) must heat be transferred to the air if the feed rate of propane is 1:35 x 105SCFH (ft3/h at STP)?
(b) The stack gas leaves the furnace at 855°F. How is the air likely to be preheated?

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