Question 2 The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, ka = 20 W/m•K and ke = 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 kg. Under steady-state operating conditions, measurements reveal an outer surface temperature of T0= 20°C , an inner surface temperature of T; = 600° C, and an oven air temperature of T= 800C. The inside convection coefficient h is known to be 25 W/m² •K. a) Sketch the equivalent thermal resistance of the circuit b) What is the value of kg? T KA kc kB Air T, h LA Lc
Question 2 The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, ka = 20 W/m•K and ke = 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 kg. Under steady-state operating conditions, measurements reveal an outer surface temperature of T0= 20°C , an inner surface temperature of T; = 600° C, and an oven air temperature of T= 800C. The inside convection coefficient h is known to be 25 W/m² •K. a) Sketch the equivalent thermal resistance of the circuit b) What is the value of kg? T KA kc kB Air T, h LA Lc
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 1.3P: 1.3 A furnace wall is to be constructed of brick having standard dimensions of Two kinds of...
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