Unformatted text preview: 2 2 2 m 65 . 28 m) 02 . 3 ( = = = ππ D A s Then the rates of heat transfer to the tank by convection and radiation become W 780 , 22 1292 488 , 21 W 1292 ] ) K 273 ( K) 288 )[( K . W/m 10 )(5.67 m 65 . 28 )( 6 . ( ) ( W 488 , 21 C ) 25 )( m C)(28.65 . W/m 30 ( ) ( rad conv total 4 4 4 28 2 4 4 rad 2 2 conv = + = + = = − × = − = = ° − ° = − = ∞ Q Q Q T T A Q T T hA Q s surr s s s & & & & & σε 1 cm ° C Iced water ° C Q & Air 25 ° C (b) The amount of heat transfer during a 24hour period is kJ 000 , 968 , 1 s) 3600 kJ/s)(24 78 . 22 ( = × = Δ = t Q Q & Then the amount of ice that melts during this period becomes kg 5898 = = = ⎯→ ⎯ = kJ/kg 7 . 333 kJ 000 , 968 , 1 if if h Q m mh Q Discussion The amount of ice that melts can be reduced to a small fraction by insulating the tank. 155...
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This note was uploaded on 01/14/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Mass, Heat

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