5 A double glazed window of 1.5 m² surface consists of two layers of glass (k = 0.78 W m-¹ K-¹) each 5 mm thick. The 15 mm thick gap between these two layers is filled with air (k = 0.026 W m¹ K-¹). The window inside temperature can be assumed to be 20°C. On the outside of the window the temperature can instead be assumed to be -2°C. Calculate the heat transfer rate through the window and the temperature at the interface between the air and the outside glass layer. (In the air-filled gap, heat transfer can be assumed by conduction only). 520

5 A double glazed window of 1.5 m² surface consists of two layers of glass (k = 0.78 W m-¹ K-¹) each 5 mm thick. The 15 mm thick gap between these two layers is filled with air (k = 0.026 W m¹ K-¹). The window inside temperature can be assumed to be 20°C. On the outside of the window the temperature can instead be assumed to be -2°C. Calculate the heat transfer rate through the window and the temperature at the interface between the air and the outside glass layer. (In the air-filled gap, heat transfer can be assumed by conduction only). 520

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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5
A double glazed window of 1.5 m² surface consists of two layers of glass (k = 0.78 W
m-1 K-¹) each 5 mm thick. The 15 mm thick gap between these two layers is filled with
air (k = 0.026 W m¹ K-¹). The window inside temperature can be assumed to be 20°C.
On the outside of the window the temperature can instead be assumed to be -2°C.
Calculate the heat transfer rate through the window and the temperature at the
interface between the air and the outside glass layer. (In the air-filled gap, heat transfer
can be assumed by conduction only).

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