Do you know how to calculate the power and power consumption of a centrifugal pump? After we know the head of the centrifugal pump we need and the water demand set per hour, how do we calculate how much power the motor needs? The power and power of the centrifugal pump What is the relationship?
The relationship between power consumption and power of centrifugal pumps
N=flow*head/(3.6*102*efficiency)=flow*head/(367.2*efficiency).
If we don’t know the efficiency of the pump, then the rough algorithm is N=flow*head/257*12
The power of the pump comes from the motor, which has its own energy loss, and the pump itself also has energy loss.
And the power marked on the pump is the output power (that is, the rated power),
Pump efficiency = output power (rated power) / input power (power consumption)
Therefore, when calculating power consumption, power consumption = rated power/efficiency.
Power is the power delivered by the prime mover to the pump at the design point. In actual work, its operating conditions will change. Therefore, the power delivered by the prime mover to the pump should have a certain margin. In addition, the output power of the motor is related to the power factor, so the rule of thumb is The power of the motor is greater than the power of the pump shaft.
The effective power of the pump=density*gravity acceleration*volume flow*head/1000
prime mover power = pump effective power / transmission ratio
The power of the prime mover is the unit power consumption.
The transmission ratio is related to the transmission mode. The transmission ratio of the direct drive of the electric motor is 1, and the transmission ratio of other various couplings ranges from 0.94 to 0.99.
The most direct relationship with the power is the motor energy efficiency level. The energy efficiency conversion rate of the second-level motor is about *0%. I can't remember the specific value accurately. The rest is consumed, such as heat, etc., the third-level motor The energy efficiency conversion is 75~80% (this is to be confirmed) to do the same work, of course, the secondary motor saves more power. But the price at the time of purchase is more expensive. If the pump is operated for a long time, you can still save money for a pump a year.
