A thermopane window consists of two pieces of glass 7 mm thick that enclose an air space 7 mm thick. The window separates room air at 20°C from outside ambient air at -10°C. The convection coefficient associated with the inner (room- side) surface is h= 10 W/m2. K. If the convection coefficient associated with the outer (ambient) air is h,= 80 W/m². K, what is the heat loss through a window that is 0.8 m long by 0.5 m wide? Neglect radiation, and assume the air enclosed between the panes to be stagnant. k, (glass) = 1.4 W/m.K, ka (air) = %3D 0.0245 W/m.K Window, 0.8 m x 0.5 m Glass FL+L+-L Air |I L= 0.007 m Air Teo =-10 °C ho = 80 W/m2-K Air Too.j = 20 °C h; = 10 W/m2•K %3D %3D

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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O H.W. 2:
A thermopane window consists of two pieces of glass 7 mm thick that enclose
an air space 7 mm thick. The window separates room air at 20°C from outside
ambient air at -10°C. The convection coefficient associated with the inner (room-
side) surface is h= 10 W/m2. K. If the convection coefficient associated with the
outer (ambient) air is h,= 80 W/m². K, what is the heat loss through a window
that is 0.8 m long by 0.5 m wide? Neglect radiation, and assume the air
enclosed between the panes to be stagnant. k, (glass) = 1.4 W/m.K, ka (air) =
0.0245 W/m.K
%3D
%3D
Window, 0.8 m x 0.5 m
Glass
!!
L= 0.007 m
Air !
Too.0 = -10 °C
ho = 80 W/m2.K
Air
Tooj = 20 °C
h; = 10 W/m2•K
Air
%3D
%3D
%D
23
Warith Alanbiyaa (Dr. ALI M)
Heat Transfer
Transcribed Image Text:O H.W. 2: A thermopane window consists of two pieces of glass 7 mm thick that enclose an air space 7 mm thick. The window separates room air at 20°C from outside ambient air at -10°C. The convection coefficient associated with the inner (room- side) surface is h= 10 W/m2. K. If the convection coefficient associated with the outer (ambient) air is h,= 80 W/m². K, what is the heat loss through a window that is 0.8 m long by 0.5 m wide? Neglect radiation, and assume the air enclosed between the panes to be stagnant. k, (glass) = 1.4 W/m.K, ka (air) = 0.0245 W/m.K %3D %3D Window, 0.8 m x 0.5 m Glass !! L= 0.007 m Air ! Too.0 = -10 °C ho = 80 W/m2.K Air Tooj = 20 °C h; = 10 W/m2•K Air %3D %3D %D 23 Warith Alanbiyaa (Dr. ALI M) Heat Transfer
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