A vertical 2-m-high and 5-m-wide double-pane window consists of two sheets of glass separated by a 5-cm-thick air gap. In order to reduce heat transfer through the window, the air space between the two glasses is partially evacuated to 0.3 atm pressure. The emissivities of the glass surfaces are 0.7 and the glass surface temperatures across the air gap are 15°C and 5°C, respectively. (Given: k= 0.02439 W/m.°C, v=4.753 x 10-5 m²/s Pr = 0.7336, and 3 = 0.003534 K-¹) 15°C Glass -5°C 2 m Frame Determine the total rate of heat transfer through the window. W

A vertical 2-m-high and 5-m-wide double-pane window consists of two sheets of glass separated by a 5-cm-thick air gap. In order to reduce heat transfer through the window, the air space between the two glasses is partially evacuated to 0.3 atm pressure. The emissivities of the glass surfaces are 0.7 and the glass surface temperatures across the air gap are 15°C and 5°C, respectively. (Given: k= 0.02439 W/m.°C, v=4.753 x 10-5 m²/s Pr = 0.7336, and 3 = 0.003534 K-¹) 15°C Glass -5°C 2 m Frame Determine the total rate of heat transfer through the window. W

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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Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.

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Required information
A vertical 2-m-high and 5-m-wide double-pane window consists of two sheets of glass separated by a 5-cm-thick air gap.
In order to reduce heat transfer through the window, the air space between the two glasses is partially evacuated to 0.3
atm pressure. The emissivities of the glass surfaces are 0.7 and the glass surface temperatures across the air gap are 15°C
and 5°C, respectively. (Given: k= 0.02439 W/m.°C, v=4.753 × 10-5 m²/s Pr = 0.7336, and ß = 0.003534 K-¹)
15°C
Glass
-5°C
2 m
Frame
Determine the total rate of heat transfer through the window.
W

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