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A furnace wall is of thickness 0.25 m (L.) and it is exposed to gas at its inner surface and to air at its outer surface. The gas and air are maintained at 400°C (T) and 50°C (T). The heat transfer coeffi- cients of hot gas (h ) and cold air (h) sides are 60 and 10 W/m'K respectively. If the surface area (A) of the wall is 3 m', find (1) the overall heat transfer coefficient; (ii) the heat transfer rate 'Q' and (iii) the surface temperature of the wall (T and T). Assume that the thermal conductivity (K) of the wall material is 1.5 W/mK.

A furnace wall is of thickness 0.25 m (L.) and it is exposed to gas at its inner surface and to air at its outer surface. The gas and air are maintained at 400°C (T) and 50°C (T). The heat transfer coeffi- cients of hot gas (h ) and cold air (h) sides are 60 and 10 W/m'K respectively. If the surface area (A) of the wall is 3 m', find (1) the overall heat transfer coefficient; (ii) the heat transfer rate 'Q' and (iii) the surface temperature of the wall (T and T). Assume that the thermal conductivity (K) of the wall material is 1.5 W/mK.

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 furnace wall is of thickness 0.25 m (L) and it is exposed to gas at its inner surface and to air at its outer surface. The gas and air are maintained at 400°C (T) and 50°C (T). The heat transfer coeffi- cients of hot gas (h_) and cold air (h_) sides are 60 and 10 W/m'K respectively. If the surface area (A) of the wall is 3 m', find (i) the overall heat transfer coefficient; (ii) the heat transfer rate 'Q' and (ii) the surface temperature of the wall (T and T). Assume that the thermal conductivity (K) of the wall material is 1.5 W/mK.
Transcribed Image Text:A furnace wall is of thickness 0.25 m (L) and it is exposed to gas at its inner surface and to air at its outer surface. The gas and air are maintained at 400°C (T) and 50°C (T). The heat transfer coeffi- cients of hot gas (h_) and cold air (h_) sides are 60 and 10 W/m'K respectively. If the surface area (A) of the wall is 3 m', find (i) the overall heat transfer coefficient; (ii) the heat transfer rate 'Q' and (ii) the surface temperature of the wall (T and T). Assume that the thermal conductivity (K) of the wall material is 1.5 W/mK.
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