In order to reduce the heat loss through a large furnace wall, the decision has been made to add external insulation. Calculate the thickness of insulation required to reduce the heat loss by 75%. Before the change is made, no outer steel shell is used.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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(5) In order to reduce the heat loss through a large furnace wall, the decision has
been made to add external insulation. Calculate the thickness of insulation
required to reduce the heat loss by 75%. Before the change is made, no outer
steel shell is used.
Page | 1
Inside
Furnace
Insulation
Refractory
Brick,
250 mm
Wall
Brick,
50 mm
Outer
Steel Shell,
25 mm
Data: Refractory brick and wall brick: k = 0.87 W/m K
Insulation: k= 0.090 W/m K
k = 43 W/m K
h = 55 W/m K (inside furnace)
h = 11 W/m K (outside furnace)
Steel:
Transcribed Image Text:(5) In order to reduce the heat loss through a large furnace wall, the decision has been made to add external insulation. Calculate the thickness of insulation required to reduce the heat loss by 75%. Before the change is made, no outer steel shell is used. Page | 1 Inside Furnace Insulation Refractory Brick, 250 mm Wall Brick, 50 mm Outer Steel Shell, 25 mm Data: Refractory brick and wall brick: k = 0.87 W/m K Insulation: k= 0.090 W/m K k = 43 W/m K h = 55 W/m K (inside furnace) h = 11 W/m K (outside furnace) Steel:
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