Thermodynamics HW Solutions 514

Thermodynamics HW Solutions 514 - Chapter 6 Fundamentals of...

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Unformatted text preview: Chapter 6 Fundamentals of Convection 6-10 The rate of heat loss from an average man walking in windy air is to be determined at different wind velocities. Assumptions 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 wind velocities are Air V T = 10 C T s = 29 C ( a ) C . W/m 174 . 9 m/s) 5 . ( 8 . 14 8 . 14 2 0.69 53 . = = = V h W 296.3 = = = C ) 10 )(29 m C)(1.7 . W/m 174 . 9 ( ) ( 2 2 T T hA Q s s & ( b ) C . W/m 8 . 14 m/s) . 1 ( 8 . 14 8 . 14 2 0.69 53 . = = = V h W 478.0 = = = C ) 10 )(29 m C)(1.7 . W/m 8 . 14 ( ) ( 2 2 T T hA Q s s & ( c ) C . W/m 58 . 19 m/s) 5 . 1 ( 8 . 14 8 . 14 2 0.69 53 . = = = V h W 632.4 = = = C ) 10 )(29 m C)(1.7 . W/m 58 . 19 ( ) ( 2 2 T T hA Q s s & 6-11 The expression for the heat transfer coefficient for air cooling of some fruits is given. The initial rate The expression for the heat transfer coefficient for air cooling of some fruits is given....
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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.

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