Thermodynamics HW Solutions 774

Thermodynamics HW Solutions 774 - Chapter 9 Natural...

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Chapter 9 Natural Convection 57 . 27 726 . 0 492 . 0 1 ) 10 383 . 6 ( 387 . 0 825 . 0 Pr 492 . 0 1 Ra 387 . 0 825 . 0 2 27 / 8 16 / 9 6 / 1 6 2 27 / 8 16 / 9 6 / 1 = + × + = + + = Nu 2 2 ft 4 ) ft 5 . 0 )( ft 4 ( 2 F . Btu/h.ft 843 . 0 ) 57 . 27 ( ft 5 . 0 F Btu/h.ft. 01529 . 0 = = ° = ° = = side side A Nu L k h Then the total heat loss from the duct can be expressed as && & & [( ) ( ) ( ) ]( ) Q Q Q Q hA hA hA T T total top bottom side top bottom side s =+ + = + + Substituting and solving for the surface temperature,
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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