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)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.55P: 2.55 A long, 1-cm-diameter electric copper cable is embedded in the center of a 25-cm-square...
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