clownfish
大粒星
        
文章: 2681 來自: Malaysia " Penang "
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于 2004-03-10 12:24 
hope to discusse to all member and set up a formula for 去水 calculation by theory : Volume = Velocity x Area Velocity = (2gH ) 1/2 Area = pie x r 2 = pie/4 x D 2 g = 9.8 m/s 2 , H = height from 滴流位去水 to s沙缸的落水喉的出水口 ( m ) 1 L = 0.001 m 3 pie = 3.1416 D = 落水喉 inner diameter ( m ) Example : H = 18 " = 0.4572 m , D = 1" = 2.54 cm = 0.0254 m Velocity = ( 2gH ) 1/2 = ( 2 x 9.8 x 0.4572 ) 1/2 = 2.9935 m/s Area = pie /4 x D 2 = 3.1416/4 x 0.0254 2 = 5.067 x 10 -4 m 2 Volume = Velocity x Area = 2.9935 m/s x 5.067 x 10 -4 m 2 = 1.5168 x 10 -3 m 3 / s 1 hour Volume = 1.5168 x 10 - 3 m 3 /s x 3600 s = 5.460 m 3 /s 1 L = 0.001 m 3 so Volume per hour = ( 5.460 m 3 /s ) / 0.001 m 3 = 5460 L/hr. from above calculation 1" diameter and 18" height can support 5460 L/hr but this result r 100% perfect data. but after some factor ( friction , corner , turbulence ............. ) it should be lower . we should add in " safety factor " Example : 5460 L/hr x 0.8( safety factor ) = 4368 L/hr. so u only can use return pump about 4300 L/r. but safety factor = 0.8 / 0.9 /0.7 i hope as much as member provide your tank data 1)return pump xxx L/hr 2) 落水喉 inner diameter 3)H = height from 滴流位去水 to s沙缸的落水喉的出水口 ( m ) from yours data maybe we can come out that safety factor = 0.X . it may help use to consider during tank set up kindly provide your data and commend. thank you 
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