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How to choose a proper fan ?

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kekon

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How to calculate a fan which one should use to cool a heatsink ? (air volume per minute) I have given power dissipated in the heatsink, its thermal resistance, ambient temperature and a temperature which should be achieved in the heatsink which is to be cooled by the fan. I found many articles concerning heatsinks but couldn't find how to calculate fans.
 

solvarg

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kekon said:
How to calculate a fan which one should use to cool a heatsink ? (air volume per minute) I have given power dissipated in the heatsink, its thermal resistance, ambient temperature and a temperature which should be achieved in the heatsink which is to be cooled by the fan. I found many articles concerning heatsinks but couldn't find how to calculate fans.

I think you can find some useful information here:
h**p://www.power-one.com/technical/articles/coolingcnvrts.pdf

Regards
 

kekon

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Well, there is some useful information, thanks. But I intend to carry out some practical experiments as well. I need to cool a heatsink where the power that must be dissipated will be about 250W.
 

batdin

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Here's a useful guideline:
Recently I did some experiments with a 12V 5cm CPU fan and found out that it reduced the thermal resistance by a factor of 6 to 7 at 12V and by a factor of 4 at 6V supply.
The fan was fixed very close to the heatsink.
 

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