The composite wall of an oven consists of three materi- als, two of which are of known thermal conductivity, KA = 20 W/m K and kc = 50 W/m K, and known thickness, LA = 0.30 m and Lc = 0.15 m. The third material, B, which is sandwiched between materials A and C, is of known thickness, LB = 0.15 m, but unknown thermal conductivity kB. Tsi Air To, h KA КВ kc 3,0 LA LB Le Under steady-state operating conditions, measurements reveal an outer surface temperature of T= 20°C, an inner surface temperature of T = 600°C, and an oven air temperature of T = 800°C. The inside convection coefficient h is known to be 25 W/m² K. What is the value of kB?
The composite wall of an oven consists of three materi- als, two of which are of known thermal conductivity, KA = 20 W/m K and kc = 50 W/m K, and known thickness, LA = 0.30 m and Lc = 0.15 m. The third material, B, which is sandwiched between materials A and C, is of known thickness, LB = 0.15 m, but unknown thermal conductivity kB. Tsi Air To, h KA КВ kc 3,0 LA LB Le Under steady-state operating conditions, measurements reveal an outer surface temperature of T= 20°C, an inner surface temperature of T = 600°C, and an oven air temperature of T = 800°C. The inside convection coefficient h is known to be 25 W/m² K. What is the value of kB?
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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The composite wall of an oven consists of three materi-
als, two of which are of known thermal conductivity,
KA = 20 W/m K and kc = 50 W/m K, and known
thickness, LA = 0.30 m and Lc= 0.15 m. The third
material, B, which is sandwiched between materials
A and C, is of known thickness, LB = 0.15 m, but
unknown thermal conductivity kB.
Tsi
Air
Th
KA
КВ
kc
3,0
LA
LB Lc
5,0
Under steady-state operating conditions, measurements
reveal an outer surface temperature of T = 20°C, an
inner surface temperature of Ti = 600°C, and an oven
air temperature of T = 800°C. The inside convection
coefficient h is known to be 25 W/m² K. What is the
value of kB?
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