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Unformatted text preview: 685 ] ) K 273 30 ( ) K 400 )[( K W/m 10 67 . 5 ]( m) 8 . ( )[ 1 )( 35 . ( ) ( 4 4 4 2 8 2 4 4 2 2 = + = = surr rad T T FA Q & The convection heat transfer rate at the outer surface of the cylinder is determined from requirement that heat transferred from the inner sphere to the outer sphere must be equal to the heat transfer from the outer surface of the outer sphere to the environment by convection and radiation. That is, W 9845 685 1669 12 = = = rad conv Q Q Q & & & Then the convection heat transfer coefficient becomes ( ) [ ] C W/m 5.04 2 = = = h h T T hA Q conv K) 303K (400 m) 8 . ( W 984 2 2 2 . & 1225...
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 Fall '10
 Dr.DanielArenas
 Thermodynamics, Convection, Mass, Heat, Radiation

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