Description
Technical Parameters
Grille Calculator
The following is Aquasust for you to sort out the correct way to calculate the amount of aeration：
- Blue block is the design datameter : be filled in
- Brown: calculate process data
- Greener: last result for your proces
| 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 coefficient 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 |
1.998 | Maximum flow rate(Qmax) | 2997 | m3/d | ||
| Over-grate flow rate (v) | 0.6 | m/s | Typical value 0.6-1.0 | ||||||
| Grid gap (b) | 0.003 | m | Coarse grating: 16-25mm for mechanical removal, 25-40mm 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 | |||||||
| Coefficient (k) | 3 | The number of times the head loss increases when the grating is clogged by dirt, generally used 3. | |||||||
| Grid section shape | form factor | drag coefficient(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*v^2*sinα/(2*g)= |
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) | |||||||||
| Expansion angle of the shoulder-width portion of the intake channel α1= | 20 | º | |||||||
| Length of the shoulder -width portion of the intake channel l1= |
0.549495484 | 0.55 | m | ||||||
| Length of tapering portion l2= | 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 | |||||
| 0.03 | -- | 0.01 | Gap of 30-50 hours | ||||||
| W= | 0.15 | m3 | |||||||
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