21. The 1 ft thick walls of a building are made of concrete (k = 2 Btu/h-ft-F). The outside temperature and heat transfer coefficient are 50 F and 2 Btu/h•ft°-F, re- spectively. Find the rate of heat transfer through 1000 ft° of the wall if the inside temperature and heat transfer coefficient are 120 F and 1 Btu/h-ft F, respectively. Both the inside and the outside of the wall are coated with 20 mils of paint (k = 0.1 Btu/h-ft-F) where 1 mil = IE-3 in. Compare the results with a bare wall.
21. The 1 ft thick walls of a building are made of concrete (k = 2 Btu/h-ft-F). The outside temperature and heat transfer coefficient are 50 F and 2 Btu/h•ft°-F, re- spectively. Find the rate of heat transfer through 1000 ft° of the wall if the inside temperature and heat transfer coefficient are 120 F and 1 Btu/h-ft F, respectively. Both the inside and the outside of the wall are coated with 20 mils of paint (k = 0.1 Btu/h-ft-F) where 1 mil = IE-3 in. Compare the results with a bare wall.
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 2.30P: 2.30 An electrical heater capable of generating 10,000 W is to be designed. The heating element is...
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The 1 ft thick walls of a building are made of concrete (k = 2 Btu/h·ft·F). The outside temperature and heat transfer coefficient are 50 F and 2 Btu/h·ft2·F, respectively. Find the rate of heat transfer through 1000 ft2 of the wall if the inside temperature and heat transfer coefficient are 120 F and 1 Btu/h·ft2 F, respectively. Both the inside and the outside of the wall are coated with 20 mils of paint (k = 0.1Btu/h·ft·F) where 1 mil = 1E-3 in. Compare the results with a bare wall.
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