Q1/ The fumace wall consists of 120 mm wide refractory brick and 120 mm wide insulating fire brick separated by an air gap. The outside wall is covered with a 12 mm thickness of plaster. The inner surface of the wall is at 1090°C and the room temperature is 20°C. The heat transfer coefficient from the outside wall surface to the air in the room is 18 W/m2 °C, and the resistance to heat flow of the air gap is 0.16 °C /W. If the thermal conductivities of the refractory brick, insulating fire brick, and plaster are 1.6, 0.3 and 0.14 W/m. °C, respectively calculates: (i) Rate at which heat is lost per m' of the wall surface; (ii) Each interface temperature.

Q1/ The fumace wall consists of 120 mm wide refractory brick and 120 mm wide insulating fire brick separated by an air gap. The outside wall is covered with a 12 mm thickness of plaster. The inner surface of the wall is at 1090°C and the room temperature is 20°C. The heat transfer coefficient from the outside wall surface to the air in the room is 18 W/m2 °C, and the resistance to heat flow of the air gap is 0.16 °C /W. If the thermal conductivities of the refractory brick, insulating fire brick, and plaster are 1.6, 0.3 and 0.14 W/m. °C, respectively calculates: (i) Rate at which heat is lost per m' of the wall surface; (ii) Each interface temperature.

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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Question

Q1/ The fumace wall consists of 120 mm wide
refractory brick and 120 mm wide insulating fire
brick separated by an air gap. The outside wall is
covered with a 12 mm thickness of plaster. The
inner surface of the wall is at 1090°C and the
room temperature is 20°C. The heat transfer
coefficient from the outside wall surface to the
air in the room is 18 W/m2 °C, and the resistance
to heat flow of the air gap is 0.16 °C /W. If the
thermal conductivities of the refractory brick,
insulating fire brick, and plaster are 1.6, 0.3 and
0.14 W/m. °C, respectively calculates: (i) Rate at
which heat is lost per m of the wall surface; (ii)
Each interface temperature.

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