The roof of a house is electrically heated. This roof is 6 m long, 8 m high wide and 0.25 m thick, and is made with a flat layer of concrete whose conductivity is ? = 0.8 ?⁄? ?. The temperatures of the inner and outer surfaces are 15 and 4 °C, respectively, for a period of 10 hrs. Determine a) the reason for the loss of heat through the roof that night
The roof of a house is electrically heated. This roof is 6 m long, 8 m high wide and 0.25 m thick, and is made with a flat layer of concrete whose conductivity is ? = 0.8 ?⁄? ?. The temperatures of the inner and outer surfaces are 15 and 4 °C, respectively, for a period of 10 hrs. Determine a) the reason for the loss of heat through the roof that night
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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The roof of a house is electrically heated. This roof is 6 m long, 8 m high
wide and 0.25 m thick, and is made with a flat layer of concrete whose conductivity
is ? = 0.8 ?⁄? ?. The temperatures of the inner and outer surfaces are
15 and 4 °C, respectively, for a period of 10 hrs. Determine a) the reason for the loss
of heat through the roof that night and b) the cost of that heat loss to the homeowner
of the house, if the cost of electricity is $0.08/kWh.
Transcribed Image Text:Techo de concreto
8 m
4 °C
15 °C
6 m
0.25 m
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