How Can Air Throw Distance for Fans Be Calculated?

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Discussion Overview

The discussion revolves around calculating the air throw distance for fans, focusing on the parameters such as fan diameter, volumetric flow rate, temperature, RPM, and power. Participants seek methods or formulas to derive this distance, exploring theoretical and practical aspects.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about methods to calculate air throw distance using specific fan parameters.
  • Another participant proposes a formula involving mass air rate, acceleration, a constant, and velocity, but expresses uncertainty about its validity.
  • A third participant mentions finding a formula online that is claimed to be applicable only to specific fans, suggesting the need for caution in generalizing its use.
  • A later reply indicates an attempt to apply Newton's First Laws for the calculation but highlights the need for a coefficient of friction between air and air, which remains unspecified.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on a specific method or formula for calculating air throw distance, with multiple competing ideas and uncertainties expressed throughout the discussion.

Contextual Notes

There are limitations regarding the applicability of certain formulas to specific fan types, and the need for additional parameters like the coefficient of friction is noted but not resolved.

hosaf
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Hello Everybody.

I have a problem.

I study calculate air throw distance for FANs. How can I calculate it?

So I have some data below.

Fan Diameter
Volumetric flow rate (m^3/h)
Temperature
RPM
Power

Please send me note or documents If you have any.

Thanks for your help.
 
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I did some internet search and found only this.
Note that they say the formula is applicable for only "their" fans.

http://www.hartzellfan.com/getbulletin/series-22t/

Maybe Ashrae has some info for HVAC systems regarding a single fan.
 
Last edited by a moderator:
Thanks for your intertest.

As you motioned that formula given by Hartzellan Co. for only their Fans.

I try to calculate with Newtons First Laws (Motion in One Dimension or Two Dimension).

But I need coefficient of friction between air and air.
 

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