Involving velocity, pressure, density and temperature as functions of space and time. Fluid Mechanics - The study of fluids - liquids and gases.Note that the affinity laws for fans are not identical with pumps.
The volume capacity can be expressed like = 2.1 bhp Pump Affinity Laws for a Family of Geometrically Similar Pumps
The final power consumption can be calculated with (3b): The final head can be calculated with (2b): The final flow capacity can be calculated with (1b): The diameter is changed from 8 to 6 inches. The diameter of the pump impeller is reduced when the pump speed is constant. = 40 bhp Example - Pump Affinity Laws - Changing Impeller Diameter The final power consumption can be calculated with (3a): The final head can be calculated with (2a): The final flow capacity can be calculated with (1a): The initial flow is 100 gpm, the initial head is 100 ft, the initial power is 5 bhp, the initial speed is 1750 rpm and the final speed 3500 rpm. The pump speed is changed when the impeller size is constant. )Įxample - Pump Affinity Laws - Changing Pump Speed )ĭp 1 - head or pressure (m, ft, Pa, psi. Q 1 - volume capacity - (m 3/s, gpm, cfm. The calculator is generic and can be used with all common units as long as the use is consistent. Replace the default values with the actual values. Pump Affinity Laws Calculator - Changing Wheel Velocity If we want to increase the volume flow capacity of an existing system with 10% we have to increase the power supply with 33%. Note! If the speed of a pump is increased with 10% Q 1 / q 2 = (n 1 / n 2) (1a) Head or Pressure If the wheel diameter is constant - change in pump wheel velocity can simplify the affinity laws to Volume Capacity
The power consumption of a centrifugal pump can be expressed as The head or pressure of a centrifugal pump can be expressed likeĭp 1 / dp 2 = (n 1 / n 2) 2 (d 1 / d 2) 2 (2)ĭp = head or pressure (m, ft, Pa, psi. N = wheel velocity - revolution per minute - (rpm) Q = volume flow capacity (m 3/s, gpm, cfm. The volume capacity of a centrifugal pump can be expressed like Pump Affinity Laws for a Specific Centrifugal Pump Volume Capacity
0 kommentar(er)
