A furnace wall is made of composite wall of total thickness 550 mm. The inside layer of wall is made of refractory material (k = 1.5 W/m°C) and outside layer of wall is made of an insulating material (k = 0.2 W/m°C). The mean temperature of the gases inside the furnace is 900°C and interface temperature is 520°C. The average heat transfer coefficient between the gases and inner surface is 230 W/m2-°C and between the outside surface and atmosphere is 46 W/m2-°C. Taking air temperature = 30°C, calculate: (a) Thickness of each layer of wall, (b) Rate of heat loss per unit area, (c) Temperatures of surfaces exposed to gases and atmosphere.
A furnace wall is made of composite wall of total thickness 550 mm. The inside layer of wall is made of refractory material (k = 1.5 W/m°C) and outside layer of wall is made of an insulating material (k = 0.2 W/m°C). The mean temperature of the gases inside the furnace is 900°C and interface temperature is 520°C. The average heat transfer coefficient between the gases and inner surface is 230 W/m2-°C and between the outside surface and atmosphere is 46 W/m2-°C. Taking air temperature = 30°C, calculate: (a) Thickness of each layer of wall, (b) Rate of heat loss per unit area, (c) Temperatures of surfaces exposed to gases and atmosphere.
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 furnace wall is made of composite wall of total thickness 550 mm. The inside
layer of wall is made of refractory material (k = 1.5 W/m°C) and outside layer of
wall is made of an insulating material (k = 0.2 W/m°C). The mean temperature of
the gases inside the furnace is 900°C and interface temperature is 520°C. The
average heat transfer coefficient between the gases and inner surface is 230
W/m2-°C and between the outside surface and atmosphere is 46 W/m2-°C. Taking
air temperature = 30°C, calculate: (a) Thickness of each layer of wall, (b) Rate of
heat loss per unit area, (c) Temperatures of surfaces exposed to gases and
atmosphere.
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