Tony Koryban Mail Bag Archives: For my fan design, is there a way I can calculate the new operating point at reduced fan speed? And how much does the audible noise go down with reduced fan speed?

Tony Koryban’s mail bag archive today addresses a problem whereby the engineer only needs it to go full blast when the room temperature goes over 40ºC. Here’s the question:

I don’t need it to run at full capacity. I only need it to go full blast when the room temperature goes over 40ºC. Maybe I could put in a speed controller to slow the fan down when I don’t need all that air, and a thermal sensor to tell it to speed up again if the room gets hot. Slowing the fan down will definitely make it quieter. Before I do that, is there a way I can calculate the new operating point at reduced fan speed? And how much does the audible noise go down with reduced fan speed?

And Tony has his usually full, practical and humorous answer of course. Read Tony’s solution to this fan fun at Tony Koryban’s Mail Bag Archive.

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