Consider a 1.2-m-high and 2-m-wide double-panewindow consisting of two 3-mm-thick layers of glass (k =0.78 W/m·K) separated by a 3-cm-wide air space. Determinethe steady rate of heat transfer through this window and thetemperature of its inner surface for a day during which theroom is maintained at 20°C while the temperature of the outdoorsis 0°C. Take the heat transfer coefficients on the innerand outer surfaces of the window to be h1 = 10 W/m2·K andh2 = 25 W/m2·K and disregard any heat transfer by radiation.Evaluate air properties at a film temperature of 10°C and1 atm pressure. Is this a good assumption?
Consider a 1.2-m-high and 2-m-wide double-panewindow consisting of two 3-mm-thick layers of glass (k =0.78 W/m·K) separated by a 3-cm-wide air space. Determinethe steady rate of heat transfer through this window and thetemperature of its inner surface for a day during which theroom is maintained at 20°C while the temperature of the outdoorsis 0°C. Take the heat transfer coefficients on the innerand outer surfaces of the window to be h1 = 10 W/m2·K andh2 = 25 W/m2·K and disregard any heat transfer by radiation.Evaluate air properties at a film temperature of 10°C and1 atm pressure. Is this a good assumption?
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
Consider a 1.2-m-high and 2-m-wide double-pane
window consisting of two 3-mm-thick layers of glass (k =
0.78 W/m·K) separated by a 3-cm-wide air space. Determine
the steady rate of heat transfer through this window and the
temperature of its inner surface for a day during which the
room is maintained at 20°C while the temperature of the outdoors
is 0°C. Take the heat transfer coefficients on the inner
and outer surfaces of the window to be h1 = 10 W/m2·K and
h2 = 25 W/m2·K and disregard any heat transfer by radiation.
Evaluate air properties at a film temperature of 10°C and
1 atm pressure. Is this a good assumption?
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