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Unformatted text preview: . 3 /s m 10 774 . 1 m) (0.2 m/s (200/60) Re = = = D V Using the relation for a square duct from Table 71, the Nusselt number is determined to be 2 . 112 ) 7235 . ( ) 10 758 . 3 ( 102 . Pr Re 102 . 3 / 1 675 . 4 3 / 1 675 . = = = = k hD Nu The heat transfer coefficient is C . W/m 24 . 15 ) 2 . 112 ( m 2 . C W/m. 02717 . 2 = = = Nu D k h Then the rate of heat transfer from the duct becomes 2 m 2 . 1 m) 5 . 1 )( m 2 . 4 ( = = s A W 640.0 = C 30))(65 m C)(1.2 . W/m 24 . 15 ( ) ( 2 2 = = T T hA Q s s & 740...
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 Fall '10
 Dr.DanielArenas
 Thermodynamics, Convection, Force, Mass, Power

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