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Unformatted text preview: ( a ) T surr = 300 K W 37.4 = ]K K) (300 273) + )[(32 m )(1.7 .K W/m 10 67 . 5 )( 7 . ( ) ( 4 4 4 2 4 2 8 4 surr 4 rad = = T T A Q s s & ( b ) T surr = 280 K W 169 = ]K K) (280 273) + )[(32 m )(1.7 .K W/m 10 67 . 5 )( 7 . ( ) ( 4 4 4 2 4 2 8 4 surr 4 rad = = T T A Q s s & Discussion Note that the radiation heat transfer goes up by more than 4 times T surr Q rad 32 C as the temperature of the surrounding surfaces drops from 300 K to 280 K. 146...
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 Fall '10
 Dr.DanielArenas
 Thermodynamics, Mass, Heat, Radiation

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