[Elecraft] Cooling fans

[Ian Stirling]

 On Saturday 29 October 2005 23:30, Don Wilhelm wrote:

> That is why I recommend pulling the air upward from the heat sink - so it
> will help pull the air from inside the KPA100 as well - in the same
> direction as the internal fan moves the air.

   I had a dramatic demonstration of how important
it is to allow heated material to rise.
 My general contractor in my bathroom renovation
mistook the pressure release safety valve in an
oil filled towel warmer (don't ask, my wife Donna
wanted it) at the top for the location to install
the heating element.  It heated the top corner
hotter than safe and the rest of the towel warmer
was stone cold after hours.
  I didn't expect to have to intervene in their
work, but when the towel warmer was clearly not
working, I became involved.
   "Heat Rises", I said.
 Putting the element at the bottom and restoring
the safety valve had the whole towel warmer
comfortably warm very quickly.
  Conduction of heat is nothing compared to its
rising.

Ian, G4ICV, AB2GR, K2 #4962
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