A composite plane wall consists of a 3-in.-thick layer of insulation (ks = 0.029 Btu/h ft. °R) and a 0.75-in.-thick layer of siding (k, = 0.058 Btu/h ft. °R). The inner temperature of the insulation is 67°F. The outer temperature of the siding is 8°F. Determine at steady state (a) the temperature at the interface of the two layers, in °F, and (b) the rate of heat transfer through the wall in Btu/h-ft² of surface area.
A composite plane wall consists of a 3-in.-thick layer of insulation (ks = 0.029 Btu/h ft. °R) and a 0.75-in.-thick layer of siding (k, = 0.058 Btu/h ft. °R). The inner temperature of the insulation is 67°F. The outer temperature of the siding is 8°F. Determine at steady state (a) the temperature at the interface of the two layers, in °F, and (b) the rate of heat transfer through the wall in Btu/h-ft² of surface area.
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.40P: As a designer working for a major electric appliance manufacturer, you are required to estimate the...
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