Energy savings and consumption reduction through variable frequency control of centrifugal pumps
Thread Content
This is about the difference in current between a variable-frequency pump whose outlet flow is manually adjusted to 6.2 cubic meters, and one for which the speed is increased to its maximum level and then the flow is controlled at 6.2 cubic meters by closing a manual valve on-site; can the difference in current really be as large as 6A?
The head is more than twice the original value. You can’t just focus on traffic
Are you saying that by closing the outlet valve, the outlet pressure increased, causing part of the energy consumed by the pump to be converted into outlet static head?
The pump motor is equipped with an inverter and operates at its normal capacity. When transporting the same volume of fluid, as the rotational speed of the pump decreases, the head pressure at the pump outlet also drops, and accordingly, the power consumption decreases as well. But it’s unknown whether the control valve from the original design is still sufficient.
Variable frequency operation is carried out according to the needs of production or supply. By changing the frictional resistance of the flow-over surface, unnecessary work can be reduced, thereby improving the effective efficiency.