uppose that the 10 cm thick concrete wall of a commercial building measures 30 m by 4 m. The energy impinging on the surface is 700 W/m^2. Under these conditions the external air temperature is 25ºC, and the internal and external surface temperatures of the concrete wall are 17ºC and 40ºC, respectively. Calculate the net amount of thermal energy radiated by the wall answer = 41,880 W Data for wall: Heat transfer coefficient of air at 25ºC = 5 W/m^2K Thermal conductivity of concrete = 1.2 W/mK Emissivity of concrete = 0.85 Stefan’s constant = 5.7 x 10^-8 W/m^2K^4
uppose that the 10 cm thick concrete wall of a commercial building measures 30 m by 4 m. The energy impinging on the surface is 700 W/m^2. Under these conditions the external air temperature is 25ºC, and the internal and external surface temperatures of the concrete wall are 17ºC and 40ºC, respectively. Calculate the net amount of thermal energy radiated by the wall answer = 41,880 W Data for wall: Heat transfer coefficient of air at 25ºC = 5 W/m^2K Thermal conductivity of concrete = 1.2 W/mK Emissivity of concrete = 0.85 Stefan’s constant = 5.7 x 10^-8 W/m^2K^4
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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Suppose that the 10 cm thick concrete wall of a commercial building measures 30 m
by 4 m. The energy impinging on the surface is 700 W/m^2. Under these conditions
the external air temperature is 25ºC, and the internal and external surface
temperatures of the concrete wall are 17ºC and 40ºC, respectively.
Calculate the net amount of thermal energy radiated by the wall
answer = 41,880 W
Data for wall:
Heat transfer coefficient of air at 25ºC = 5 W/m^2K
Thermal conductivity of concrete = 1.2 W/mK
Emissivity of concrete = 0.85
Stefan’s constant = 5.7 x 10^-8 W/m^2K^4
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