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| Hangzhou AquaSust Water Technology Co., Ltd. Head ofice: #2808, Baiyue Center, Linping, Hangzhou, Zhejiang, China M:+86 152 6746 2807 Email: [email protected] website: www.nihaowater.com www.chinambbr.com www.aquasust.com www.aquasustfactory.com |
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| Juntai Grille Calculator | |||||||||
| Blue block is the design datameter: be filled in Brown:calculate process data Red:last result for your process |
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| Average flow rate (L/S) | 5 | 15 | 40 | 70 | 100 | 200 | 500 | ≥ 1000 | |
| Average batch flow rate(m³/d) | 432 | 1296 | 3456 | 6048 | 8640 | 17280 | 43200 | 86400 | |
| Total coeficient of variation | 2.3 | 2 | 1.8 | 1.7 | 1.6 | 1.5 | 1.4 | 1.3 | |
| 1. Design parameterization | |||||||||
| Flow rate(Q) | 1500 | m³/d | Coefficient of variation Kz |
1998 | Maximum flow rate(Qmax) | 2997 | m³/d | ||
| Over-grate flow rate (V) | 0.6 | m/s | Typical value 0.6-1.0 | ||||||
| Gid gap(b) | 0.003 | m | Coarse grating:16-25mm for mechanical removal,2540mm for manual removal,up to 100mm Fine grating:1.5-10mm | ||||||
| Grid inclination angle(α) | 70 | o | 60-90 for mechanical removal and 30-60 degrees for manual removal | ||||||
| Bar width(S) | 0.001 | m | |||||||
| Water depth in front of the grating(h) | 0.3 | m | |||||||
| Gravity acceleration(g) | 9.8 | m/s2 | |||||||
| Coeffcient (k) | 3 | The number of times the head loss increases when the grating is clogged by dirt,generally used 3。 | |||||||
| Grid sectionshape | form factor | drag coeffcient( ξ) | |||||||
| Sharp-edged rectangle | β=2.42 | ξ=β(S/b)^(4/3) | 0.559311428 | ||||||
| Semi-circular rectangle at the water surface | β=1.83 | 0.422950377 | |||||||
| Round | β=1.79 | 0.41370556 | |||||||
| Semi-circular rectangle on both the waterfront and the backwater |
β=1.67 | 0.385971109 | |||||||
| Trapezoidal | β=2.00 | 0.46224085 | |||||||
| Square | ε=0.64 | ξ=(b+S)/εb-1)^2 | 1.173611111 | ||||||
| 2. Calculation of grille width | |||||||||
| Number of grating gaps(n) | 62.26903693 | 63 | pcs | ||||||
| Grid width (B) | 0.255 | 0.3 | m | ||||||
| Width of canal in front of grille(B1) | 0.14453125 | 0.1 | m | ||||||
| 3. Head loss through the grille(h1) | |||||||||
| Calculate head loss (h⁰)=ξ*v²*sinal(2*9)= |
0.009653525 | m | |||||||
| h1=h0*k= | 0.028960576 | m | |||||||
| 4. Total height of groove behind fence(H) | |||||||||
| H=h+h1+h2= | 0.628960576 | 0.63 | |||||||
| h2—Excessive height of the channel in front of the fence,generally taking the value of |
0.3 | m | |||||||
| 5. Total length of grid channel(L) | |||||||||
| Expansionangle of the shoulder-width portion of the intake channelα1= |
20 | ||||||||
| Length of the shouder -width portion of the intake channell1= |
0.549495484 | 055 | m | ||||||
| Length oftapering portionl2= | 0.275 | m | |||||||
| Depth of the channel in front of the grate(H1) |
0.6 | m | |||||||
| L= | 3.973486452 | 4 | m | ||||||
| 6. Daily slagging capacity(W) | |||||||||
| slagging rate W1= | 0.1 | - | 0.05 | Gap of 16-25 hours | |||||
| - | 0.01 | Gap of 30-50 hours | |||||||
| W= | 0.15 | 2 | |||||||
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