Unformatted text preview: âŽ§ + + = Ra Nu 2 2 m 25 . 94 ) m 100 )( m 3 . ( C . W/m 366 . 4 ) 29 . 53 ( m 3 . C W/m. 02458 . = = = Â° = Â° = = Ï€Ï€ DL A Nu L k h s c and W 287 , 10 C ) 25 )( m 25 . 94 )( C . W/m 366 . 4 ( ) ( 2 2 = Â° âˆ’ Â° = âˆ’ = âˆž T T hA Q s s & The radiation heat loss from the cylinder is W 808 , 18 ] ) K 273 30 ( ) K 273 25 )[( .K W/m 10 67 . 5 )( m 25 . 94 )( 8 . ( ) ( 4 4 4 2 8 2 4 4 = + âˆ’ âˆ’ + Ã— = âˆ’ = âˆ’ surr s s rad T T A Q ÏƒÎµ & Then, kW 29.1 = = + = + = W 094 , 29 808 , 18 287 , 10 radiation convection natural total Q Q Q & & & The total amount and cost of heat loss during a 10 hour period is kWh 9 . 290 h) kW)(10 1 . 29 ( = = Î” = t Q Q & $26.18 = = /kWh) kWh)($0.09 9 . 290 ( Cost 925...
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Resistance, Convection, Mass, Power, Heat

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