(a) What is the rate of energy loss in watts per square meter through a glass window 2.9 mm thick if the outside temperature is -15°F and the inside temperature is +78°F? (b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 6.8 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy- loss mechanism? (The thermal conductivity of window glass is 1.0 W/m-K, and of air is 0.026 W/m.K.) (a) Number i (b) Number i Units Units ✪

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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(a) What is the rate of energy loss in watts per
square meter through a glass window 2.9 mm thick
if the outside temperature is -15°F and the inside
temperature is +78°F? (b) A storm window having
the same thickness of glass is installed parallel to
the first window, with an air gap of 6.8 cm between
the two windows. What now is the rate of energy
loss if conduction is the only important energy-
loss mechanism? (The thermal conductivity of
window glass is 1.0 W/m-K, and of air is 0.026
W/m.K.)
Jak w
(a) Number i
(b) Number i
Units
Units
✪
✪
Transcribed Image Text:(a) What is the rate of energy loss in watts per square meter through a glass window 2.9 mm thick if the outside temperature is -15°F and the inside temperature is +78°F? (b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 6.8 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy- loss mechanism? (The thermal conductivity of window glass is 1.0 W/m-K, and of air is 0.026 W/m.K.) Jak w (a) Number i (b) Number i Units Units ✪ ✪
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