س�ا�ات ا�&O

س�ا�ات ا�&O - () 110 : :...

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Unformatted text preview: () 110 : : 31/3/1389 . :() 0.557 .1 . 3.05m2.44 . m2 . 25.4mm (W/(m.K 0.155 . ( ) 0.692 3.18mm . C6.7- C26.7 (W/(m2.K 8.5 . ( W/(m2.K 8.5 . 50oC oC 18 . 58m2 . 27oC . 2400W/m2.oC Steam 50C .2 (mass flow rate) 27C kg/s : 50oC) ( hfg = 2305 kJ/kg Cp(water)= 4.180 kJ/kg.oC 18C Water m/s 3.5 107C . 5m (k = 14.2 W/m C) . Do = 1.4 cm Di = 1.0 cm ,ho = 8400 W/m2 C . Ui . 50C .3 = / = 0.268 10 -6 m 2 /s k = 0.682 W/m 2 .K Pr = 1.58 Nu = () Nu = hDh = 1.7 Re 0.2 Gr 0.1 k hDh = 0.023 Re 0.8 Pr 0.3 k 100C 2cm .5 250C 1 : . K=1.4 W/m.K, =2225 kg/m3, Cp=835 J/kg.K, =0.9, =0.8 . ft 0.04 .4 : r Btu q 0 = 5 10 6 ( ) 3 3 R ft - hr : Btu -9 q r = R = . .T 4 , = 0.6, = 1.71 10 2 ft - hr - R 4 Btu 20 ft - hr - F . ( . 25oC W/m2.K 5 . (2 (3 . (4 (5 . (6 . ...
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This note was uploaded on 01/20/2011 for the course MECH 24 taught by Professor Pasha during the Spring '10 term at Amirkabir University of Technology.

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