Fan affinity laws

Affinity laws can be used to calculate volume capacity, head or power consumption when speed and wheel diameters are changed. Turbo machines affinity laws can be used to calculate volume capacity, head or power consumption in centrifugal pumps with changing speed or wheel diameters. They apply to pumps, fans , and hydraulic turbines. In these rotary implements, the affinity laws . Nomenclature for symbols used in this page:- q v.

Fan Laws, also known as Affinity Laws , govern the performance of geometrically similar Centrifugal fans.

These laws apply only approximately to other, i.

The calculations are long and involved and the are expressed in terms of three affinity laws. In this work we use kinetic theory to attack this problem. The analysis is based on the reduced impeller being geometrically similar and operated at dynamically similar . Thumbnails Document Outline Attachments.

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Go to First Page Go to Last Page. Rotate Clockwise Rotate Counterclockwise. The Affinity Laws govern the performance of your pumps.

The laws will help you extrapolate and predict pump performance at different velocities.

They are also useful to modify your pumps for new and different required duties. The fan affinity laws express the relationship between elements of fan performance and power use. But what if one of the variables in the application needs to change, and the curve that came perfectly packaged with the pump no longer applies? The affinity laws express the mathematical relationship between the several variables involved in pump performance.

With impeller diameter, held constant: Affinity Laws.

A change in speed (RPM) of any fan will predictably change the pressure rise and . Watch this video highlighting an affinity law impacting equipment designers who are designing belt drives for centrifugal pumps or fan drive applications. Brent Oman from the Gates product application engineering group highlights an affinity law that impacts equipment designers who are designing belt drives for centrifugal pumps or fan drive applications. The driven RPM you select for your new components greatly affects the actual power draw of the motor.