[Drake] Cooling fans - blow in or out?

[Steve Thompson]

Garey Barrell wrote:
> Chris -
>
> For a piece of equipment that is NOT  _designed_  to be forced air
> cooled, the most effective cooling is done by having the fan blow OUT,
> or better still UP to  _aid_  in getting warm air away from the
> immediate area.  A fan mounted on the back of the final cage of a
> Drake transmitter will keep it cool, and greatly extend the life of
> the final tubes and associated components.
Blowing out (or should that be sucking out?) works in a situation like this
where you want to remove a build up of stagnant, hot air.

If you want to actively cool a component surface, you need to blow onto it.
Air naturally follows a path of least resistance. Air sucked into a fan
tends to have a neat, ordered flow and will skirt round components, leaving
a thin layer of stagnant air right on the surface. Air coming out of the fan
blades has a lot of turbulence, and it's this that breaks up the stratified
flow and gets moving air in contact with the component surface.

Steve



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