16. The roof of an electrically heated home is 6 m long, 8 m wide, and 0.25 m thíck, and is made of a flat layer of concrete whose thermal conductivity is k= 0.8 W/m - "C. The temperatures of the inner and the outer surfaces of the roof one night are measured to be 15°C and 4"C, respectively, for a period of 10 hours. Determine (a) the rate of heat loss through the roof that night and (b) the cost of that heat loss to the home owner if the cost of electricity is $0.08/kWh. (7.5)

16. The roof of an electrically heated home is 6 m long, 8 m wide, and 0.25 m thíck, and is made of a flat layer of concrete whose thermal conductivity is k= 0.8 W/m - "C. The temperatures of the inner and the outer surfaces of the roof one night are measured to be 15°C and 4"C, respectively, for a period of 10 hours. Determine (a) the rate of heat loss through the roof that night and (b) the cost of that heat loss to the home owner if the cost of electricity is $0.08/kWh. (7.5)

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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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

16. The roof of an electrically heated home is 6 m long, 8 m wide, and 0.25 m thick, and is made of a flat
layer of concrete whose thermal conductivity is k = 0.8 W/m - °C. The temperatures of the inner and the
outer surfaces of the roof one night are measured to be 15°C and 4°C, respectively, for a period of 10
hours. Determine (a) the rate of heat loss through the roof that night and (b) the cost of that heat loss to
the home owner if the cost of electricity is $0.08/kWh.
(7.5)
Concrete roof-
15°C

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