A composite three layered wall is formed of a 0.5 cm thick alunminum plate, a 0.25 cm thick layer of sheet asbestos, and a 2.0 cm thick layer of rock wool (density = 64 kg/m'); the asbestos is the center layer. The outer aluminum surface is at 500°C, and the other rock wool surface is at 50°C. Determine the heat flow per unit area. The thermal conductivities of the materials are as follows: Substance Aluminum Asbestos Тетрerature 500°C k(W/m-K) 268.08 93°C 0.17 Rock Wool 51°C 0.05 954 W/m? b. 1085 W/m? 456 W/m? d. 1840 W/m? a. с.
A composite three layered wall is formed of a 0.5 cm thick alunminum plate, a 0.25 cm thick layer of sheet asbestos, and a 2.0 cm thick layer of rock wool (density = 64 kg/m'); the asbestos is the center layer. The outer aluminum surface is at 500°C, and the other rock wool surface is at 50°C. Determine the heat flow per unit area. The thermal conductivities of the materials are as follows: Substance Aluminum Asbestos Тетрerature 500°C k(W/m-K) 268.08 93°C 0.17 Rock Wool 51°C 0.05 954 W/m? b. 1085 W/m? 456 W/m? d. 1840 W/m? a. с.
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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Transcribed Image Text:A composite three layered wall is formed of a 0.5 cm thick alunminum plate, a 0.25 cm
thick layer of sheet asbestos, and a 2.0 cm thick layer of rock wool (density = 64
kg/m'); the asbestos is the center layer. The outer aluminum surface is at 500°C, and
the other rock wool surface is at 50°C. Determine the heat flow per unit area. The
thermal conductivities of the materials are as follows:
Substance
Aluminum
Asbestos
Тетрerature
500°C
k(W/m-K)
268.08
93°C
0.17
Rock Wool
51°C
0.05
954 W/m?
b. 1085 W/m?
456 W/m?
d. 1840 W/m?
a.
с.
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