On Saturday, April 13, 2002, at 05:03 AM, the pickle wrote:
> 1) what if the fan were reversed to blow *into* the PSU and some vents
> cut
> in the side of the PSU casing for this purpose? Seems like that would
> get
> the CPU heat out of the case faster, but it also might cause problems
> since
> it would then be sucking instead of blowing across the heatsink.
FWIW PC CPU Fans (which have to work well to prevent you Athlon
disappearing in a cloud of black smoke!) blow down onto the heatsink. I
think this forces the molecules of cold air against the metal where they
pick up the heat. It is a more effective cooling method than simply
drawing what hot air is in the heatsink matrix out. I don't know what
the Peltier fan/heatsink system looks like but blowing onto the heatsink
is definitely better.
> 2) would a higher-flow fan in this position be of much use?
Undoubtably, if it blows more air onto the heatsink, the better.
> 3) what if the vents were cut in the PSU casing but the fan were left
> blowing *onto* the heatsink? It would draw some of the air out of the
> vent
> stream through the PSU (which is remarkably straight and unencumbered,
> by
> the way) and set up a bit of recirculation but I wonder if this might
> not
> be useful for getting more air over the heatsink.
You risk drawing already hot air off the PSU components that way, I
wouldn't recommend it. Bear in mind tht Mac cases are actually designed
for the hardware in them and, even if a little under-engineered, are
probably designed the best way round to start with in most cases.
--
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