tomw wrote:
A liquid-air heat exchanger is designed to have very large surface to volume
ratio and thin thermally conductive walls, increasing heat transfer from the
liquid through the metal to air. I've been using them for almost 30 years.
We use air cooling, fans blowing directly on the object to be cooled, when
the heat load is lower, and liquid circulated to heat exchangers when the
heat load is higher.
But, a solid-to-air heat exchanger can be designed exactly the same way.
Examples can be found in many products, for cooling things like
batteries or semiconductors. You just have to provide many thin fins
rather than a few thick ones, and minimize the distance that the heat
has to flow through metal.
My point was that the improved cooling isn't due to the liquid; it's due
to the increased surface area of the heatsink itself.
--
For every complex problem, there is a solution that is simple, obvious,
and wrong. -- H.L. Mencken
--
Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
For EV drag racing discussion, please use NEDRA
(http://groups.yahoo.com/group/NEDRA)
