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
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.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff3827ab1-7dcf-4cd2-894f-efa2ee587599%2F1a185c1d-992a-4c2b-a076-60931b5ce10d%2Ffdiw31k_processed.jpeg&w=3840&q=75)
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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