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A wall is constructed using bricks made of 3 different materials (A, B, C) as shown in the figure (all  dimensions are in cm). The depth of the wall is ( w = 20 ),  The pattern repeats  itself every 20 cm distance in the vertical direction. Thermal conductivities of the materials are given as kA=0.5 W/mK, kB=1 and kC=0.35. Inside and outside temperatures are 20 oC and 45 oC, respectively. Considering only  convection inside (h=10 W/m2K) and both convection (h=25 W/m2K) and radiation (h=20 W/m2K) outside:  w (m) = ? (a) Draw the thermal resistance network (b) Total thermal resistance (c) Total heat transfer rate from the repeated section (d) Temperature Tx

A wall is constructed using bricks made of 3 different materials (A, B, C) as shown in the figure (all  dimensions are in cm). The depth of the wall is ( w = 20 ),  The pattern repeats  itself every 20 cm distance in the vertical direction. Thermal conductivities of the materials are given as kA=0.5 W/mK, kB=1 and kC=0.35. Inside and outside temperatures are 20 oC and 45 oC, respectively. Considering only  convection inside (h=10 W/m2K) and both convection (h=25 W/m2K) and radiation (h=20 W/m2K) outside:  w (m) = ? (a) Draw the thermal resistance network (b) Total thermal resistance (c) Total heat transfer rate from the repeated section (d) Temperature Tx

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A wall is constructed using bricks made of 3 different materials (A, B, C) as shown in the figure (all 
dimensions are in cm). The depth of the wall is ( w = 20 ),  The pattern repeats 
itself every 20 cm distance in the vertical direction. Thermal conductivities of the materials are given as kA=0.5
W/mK, kB=1 and kC=0.35. Inside and outside temperatures are 20 oC and 45 oC, respectively. Considering only 
convection inside (h=10 W/m2K) and both convection (h=25 W/m2K) and radiation (h=20 W/m2K) outside: 

w (m) = ?

(a) Draw the thermal resistance network

(b) Total thermal resistance

(c) Total heat transfer rate from the repeated section

(d) Temperature Tx

OUTSIDE INSIDE (20 °C) (45 °C) В 4 20 10 Tx A B B. 20 6. 10
Transcribed Image Text:OUTSIDE INSIDE (20 °C) (45 °C) В 4 20 10 Tx A B B. 20 6. 10
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