Unformatted text preview: rate of 80 W can be determined from kg/s 007944 . C ) 50 60 )( C J/kg. 1007 ( J/s 80 ) ( ) ( = ° − ° = − = ⎯→ ⎯ − = in out p in out p T T C Q m T T C m Q & & & & In the worst case the exhaust fan will handle air at 60 ° C. Then the density of air entering the fan and the volume flow rate becomes /min m 0.6497 3 = = = = = = = /s m 01083 . kg/m 0.7337 kg/s 007944 . kg/m 7337 . 273)K + /kg.K)(60 kPa.m 287 . ( kPa 70.12 3 3 3 3 ρ m V RT P & & For an average velocity of 120 m/min, the diameter of the duct in which the fan is installed can be determined from cm 8.3 = = = = ⎯→ ⎯ = = m 083 . ) m/min 120 ( ) /min m 6497 . ( 4 4 4 3 2 ππ π V V D V D V A V c & & Cooling air 861...
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 Fall '10
 Dr.DanielArenas
 Fluid Dynamics, Thermodynamics, Convection, Force, Mass, Heat

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