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3-152 Consider a 25-m-long thick-walled concrete duct (k = 0.75 W/m-K) of square cross section. The outer dimensions of the duct are 20 cm x 20 cm, and the thickness of the duct wall is 2 cm. If the inner and outer surfaces of the duct are at 100°C and 30°C, respectively, determine the rate of heat trans- fer through the walls of the duct. Answer: 47.1 kW 30°C. 100°C +16 cm -20 cm- FIGURE P3-152 25 m

3-152 Consider a 25-m-long thick-walled concrete duct (k = 0.75 W/m-K) of square cross section. The outer dimensions of the duct are 20 cm x 20 cm, and the thickness of the duct wall is 2 cm. If the inner and outer surfaces of the duct are at 100°C and 30°C, respectively, determine the rate of heat trans- fer through the walls of the duct. Answer: 47.1 kW 30°C. 100°C +16 cm -20 cm- FIGURE P3-152 25 m

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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FIGURE P3-151 3-152 Consider a 25-m-long thick-walled concrete duct (k = 0.75 W/m-K) of square cross section. The outer dimensions of the duct are 20 cm x 20 cm, and the thickness of the duct wall is 2 cm. If the inner and outer surfaces of the duct are at 100°C and 30°C, respectively, determine the rate of heat trans- fer through the walls of the duct. Answer: 47.1 kW 30°C 100°C 16 cm -20 cm- FIGURE P3-152 25 m
Transcribed Image Text:FIGURE P3-151 3-152 Consider a 25-m-long thick-walled concrete duct (k = 0.75 W/m-K) of square cross section. The outer dimensions of the duct are 20 cm x 20 cm, and the thickness of the duct wall is 2 cm. If the inner and outer surfaces of the duct are at 100°C and 30°C, respectively, determine the rate of heat trans- fer through the walls of the duct. Answer: 47.1 kW 30°C 100°C 16 cm -20 cm- FIGURE P3-152 25 m
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