How do you calculate the power of an agitator motor?
Agitator speed is then determined using relation Nq = Q/ND3, where N is the Agitator speed. Reynolds number is calculated using relation, Re = D2Nρ/μ and a new Pumping number is determined using generic agitator curves. All previous steps are repeated, till correct speed is determined….Agitator Power.
| Power (P) | Np.ρ.N3.D5 | |
|---|---|---|
| P | kW | 0.851 |
What is an agitator power number?
Power Number is a dimensionless parameter based on the power in Watt consumed by the agitating rotor = impellers for the SUB and turbines for the SUF.
How do you calculate Reynolds number for agitator?
Reynolds number for mixing is a defined quantity, which you have identified correctly as Re=rho*D^2*N/mu where D is the agitator diameter and N is RPMs.
How do you calculate critical agitator speed?
Critical Speed, Nc = 60 x 4.987 / D^0.5 = 60 x 4.987 / (7.61^0.5) = 108.47 ~108 RPM. Gearbox ratio = Mr / (Nc – 25) = 1475 / (108 – 25) = 17.77 ~18, That’s it, we have done ………!!!!
How do you determine motor capacity?
Calculation of motor capacity
- n = i x n1. n : Motor speed (min–1) n1 : Speed of gear output shaft or pulley etc. attached to it. i : Reduction ratio of gear head (e.g. i = 20 for 1/20)
- 1) Set the suitable SPEED.
- 2) Voltage calculation.
- 3) Torque measurement.
- 4) Set the speed torque.
How does VFD affect torque?
When a VFD increases frequency above 60 hertz, HP and torque do a complete flip flop. HP remains at 100 percent, and torque decreases as frequency increases. The torque reduction occurs because motor impedance increases with increasing frequency.
What is d’t ratio agitator?
The pumping number for a given impeller type is a function mainly of Reynolds number and D/T (impeller to tank diameter) ratio. Thus, the same amount of pumping can be created by a small impeller turning at a high speed or a larger impeller turning at a slower speed.
How to select the power number of the agitator?
STEP 1 : Calculate the power number of the agitator The power number in turbulent conditions is tabulated for standard design in the table above. The Engineer must select the type of agitator and then may correct the standard power number according to the actual size of the agitator in the tank.
What is the RPM of the agitator in the reactor?
( Current detail is Agitator RPM=48, Motor RPM 1400, Agitator type= Anchor with paddle type, Reactor SSR 250 Lit.). We need to increase the RPM up to 75-80 with same agitator.
What is the function of agitator?
Tanks holding liquid are often equipped with an agitator. The agitator can have many functions, like improving the heat transfer, homogenizing different liquid, preventing sedimentation…etc… One of the most common agitator design for holding tanks or for mixing liquids is a turbine impeller. The following design are standard :
What is the size of agitator tank?
Tank Diameter is 2525 mm, Tank height is 2250 mm, Liquid Viscosity is 3000 Cp, Density is 1500 Kg/m3, Blade diameter is 2480 mm, Blade width is 50 mm, Blade thickness is 10 mm, Hight is 16oo mm. Pl advise me to ho to calculate the Required power for agitator.