The performance of a fan is defined by the flow, fan pressure, and power draw of the fan. The fan affinity laws (also called the fan laws for short) are a set of inter-related equations that predict the performance of the fan under varying designs and conditions. For example, from a fan applications perspective some fan laws dictate how the performance of the fan will vary if we change the density, or the rotational speed of the fan. From a fan design perspective other fan laws can predict the change in performance due to changes in impeller diameter or size. Yet another will predict the change in the noise generated by the fan.
In this introductory self-guided fan applications engineering course, you will apply a simplified set of affinity laws to predict fan performance changes due to changes in rotational speed and changes in density compared to published catalog performance. In this course changes to the compressibility factor are not taken into consideration. See FSO225 Advanced Affinity Laws for high-pressure systems where the compressibility factor cannot be ignored.
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