3-19 Consider a 1.2-m-high and 2-m-wide double-pane win- dow consisting of two 3-mm-thick layers of glass (k = 0.78 W/m . °C) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m. °C). Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is -5°C. Take the convection heat transfer coefficients on the inner and outer Glass 3 12 3 mm Frame FIGURE P3-19 = surfaces of the window to be h₁ = 10 W/m² °C and h₂ 25 W/m². °C, and disregard any heat transfer by radiation.

3-19 Consider a 1.2-m-high and 2-m-wide double-pane win- dow consisting of two 3-mm-thick layers of glass (k = 0.78 W/m . °C) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m. °C). Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is -5°C. Take the convection heat transfer coefficients on the inner and outer Glass 3 12 3 mm Frame FIGURE P3-19 = surfaces of the window to be h₁ = 10 W/m² °C and h₂ 25 W/m². °C, and disregard any heat transfer by radiation.

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

3-19 Consider a 1.2-m-high and 2-m-wide double-pane win-
dow consisting of two 3-mm-thick layers of glass (k = 0.78
W/m . °C) separated by a 12-mm-wide stagnant air space (k =
0.026 W/m. °C). Determine the steady rate of heat transfer
through this double-pane window and the temperature of its
inner surface for a day during which the room is maintained
at 24°C while the temperature of the outdoors is -5°C. Take
the convection heat transfer coefficients on the inner and outer
Glass
3 12 3 mm
Frame
FIGURE P3-19
=
surfaces of the window to be h₁ = 10 W/m² °C and h₂
25 W/m². °C, and disregard any heat transfer by radiation.

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