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2.2 An oven whose thickness of side wall is 82.5mm has a thermal conductivity of wall insulation of 0.044 W/m °C. The temperature on inside of the side wall is 175 °C and the energy dissipated by the electric coil within the oven is 40.5 W. Determine the area of wall surface so that temperature on the other side of wall does not exceed 75 °C. (

2.2 An oven whose thickness of side wall is 82.5mm has a thermal conductivity of wall insulation of 0.044 W/m °C. The temperature on inside of the side wall is 175 °C and the energy dissipated by the electric coil within the oven is 40.5 W. Determine the area of wall surface so that temperature on the other side of wall does not exceed 75 °C. (

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
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3m² 170°C Q 100°C dx=L=100mm = 0.1m
Transcribed Image Text:3m² 170°C Q 100°C dx=L=100mm = 0.1m
2.1 i. ii. 2.2 A plane wall with thermal conductivity of 10.2 W/m °C, thickness of 100mm, and area of 3m². The steady surface temperatures are 170 °C and 100 °C, as shown in the figure below. Determine: rate of heat flow across the plane wall and, temperature gradient in the flow direction. ( An oven whose thickness of side wall is 82.5mm has a thermal conductivity of wall insulation of 0.044 W/m °C. The temperature on inside of the side wall is 175 °C and the energy dissipated by the electric coil within the oven is 40.5 W. Determine the area of wall surface so that temperature on the other side of wall does not exceed 75 °C. (4) A 2-kW resistance heater wire whose thermal conductivity is k = 15 W/m - °C has a diameter of D = 4 mm and a length of L = 0.5 m, and is used to boil water. If the outer surface temperature of the resistance wire is Ts = 105°C, determine the temperature at the centre of the wire. (.
Transcribed Image Text:2.1 i. ii. 2.2 A plane wall with thermal conductivity of 10.2 W/m °C, thickness of 100mm, and area of 3m². The steady surface temperatures are 170 °C and 100 °C, as shown in the figure below. Determine: rate of heat flow across the plane wall and, temperature gradient in the flow direction. ( An oven whose thickness of side wall is 82.5mm has a thermal conductivity of wall insulation of 0.044 W/m °C. The temperature on inside of the side wall is 175 °C and the energy dissipated by the electric coil within the oven is 40.5 W. Determine the area of wall surface so that temperature on the other side of wall does not exceed 75 °C. (4) A 2-kW resistance heater wire whose thermal conductivity is k = 15 W/m - °C has a diameter of D = 4 mm and a length of L = 0.5 m, and is used to boil water. If the outer surface temperature of the resistance wire is Ts = 105°C, determine the temperature at the centre of the wire. (.
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