A wall is composed of a 12 cm-thick layer of material A and a 20 cm-thick layer of material B. The temperature of the outer surface of layer A is known to be 260oC when the outer temperature at layer B is at 30oC. A layer of 2.5 cmthick insulation (k=0.09 W/m2 oC) is added to the outer surface of layer B. Under these conditions it is observed that the surface of layer A rises to 310oC and the junction between layer B and the insulation (formerly the outer surface of layer B) becomes 220oC. If the insulation surface temperature is measured to be 25oC, what is the rate of heat flow, per square meter of wall area, before and after the insulation is added?
A wall is composed of a 12 cm-thick layer of material A and a 20 cm-thick layer of material B. The temperature of the outer surface of layer A is known to be 260oC when the outer temperature at layer B is at 30oC. A layer of 2.5 cmthick insulation (k=0.09 W/m2 oC) is added to the outer surface of layer B. Under these conditions it is observed that the surface of layer A rises to 310oC and the junction between layer B and the insulation (formerly the outer surface of layer B) becomes 220oC. If the insulation surface temperature is measured to be 25oC, what is the rate of heat flow, per square meter of wall area, before and after the insulation is added?
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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A wall is composed of a 12 cm-thick layer of material A and a 20 cm-thick
layer of material B. The temperature of the outer surface of layer A is known to
be 260oC when the outer temperature at layer B is at 30oC. A layer of 2.5 cmthick insulation (k=0.09 W/m2 oC) is added to the outer surface of layer B.
Under these conditions it is observed that the surface of layer A rises to 310oC
and the junction between layer B and the insulation (formerly the outer surface
of layer B) becomes 220oC. If the insulation surface temperature is measured to
be 25oC, what is the rate of heat flow, per square meter of wall area, before and
after the insulation is added?
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