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Unformatted text preview: 1 Steady operating conditions exist. 2 Convection heat transfer coefficient is constant over the entire surface. Analysis The convection heat transfer coefficients and the rate of heat losses at different walking velocities are ( a ) C . W/m 956 . 5 m/s) 5 . ( 6 . 8 6 . 8 2 0.53 53 . ° = = = V h Air V ∞ T ∞ = 10 ° C T s = 30 ° C W 214.4 = ° − ° = − = ∞ C ) 10 )(30 m C)(1.8 . W/m 956 . 5 ( ) ( 2 2 T T hA Q s s & ( b ) C . W/m 60 . 8 m/s) . 1 ( 6 . 8 6 . 8 2 0.53 53 . ° = = = V h W 309.6 = ° − ° = − = ∞ C ) 10 )(30 m C)(1.8 . W/m 60 . 8 ( ) ( 2 2 T T hA Q s s & ( c ) C . W/m 66 . 10 m/s) 5 . 1 ( 6 . 8 6 . 8 2 0.53 53 . ° = = = V h W 383.8 = ° − ° = − = ∞ C ) 10 )(30 m C)(1.8 . W/m 66 . 10 ( ) ( 2 2 T T hA Q s s & ( d ) C . W/m 42 . 12 m/s) . 2 ( 6 . 8 6 . 8 2 0.53 53 . ° = = = V h W 447.0 = ° − ° = − = ∞ C ) 10 )(30 m C)(1.8 . W/m 42 . 12 ( ) ( 2 2 T T hA Q s s & 62...
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This note was uploaded on 01/22/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Convection, Mass, Heat

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