(5) In order to reduce the heat loss through a large furnace wall, the decision hasbeen made to add external insulation. Calculate the thickness of insulationrequired to reduce the heat loss by 75%. Before the change is made, no outersteel shell is used.Page | 1InsideFurnaceInsulationRefractoryBrick,250 mmWallBrick,50 mmOuterSteel Shell,25 mmData: Refractory brick and wall brick: k = 0.87 W/m KInsulation: k= 0.090 W/m Kk = 43 W/m Kh = 55 W/m K (inside furnace)h = 11 W/m K (outside furnace)Steel:

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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.

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.

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.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.23P

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

100%

(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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