Message-ID: <001001c0b81f$fce16220$f4a10f3f@f3g6s4>
Reply-To: "dfs" <dfs@gateway.net>
Reply-To: lancair.list@olsusa.com
From: "dfs" <dfs@gateway.net>
To: "Lancair list" <lancair.list@olsusa.com>
Subject: Re Peltier Modules
Date: Wed, 28 Mar 2001 23:15:07 -0800
Mime-Version: 1.0

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Re: Brent's comments of a couple posts ago. I wasn't pooh-poohing the idea,
Brent, just listing some of the things that appear to need some serious
engineering.

I've always ascribed to the idea that thinking up something neat to do is
the hard part -- after that, it's mostly (!) just an engineering problem.

Back when I was designing industrial strength inverters for, what else,
industrial applications, in the 30 to 60 Kva range, we used a neat extruded
aluminum heat-sink (e.g., heat-exchanger) assembly for the SCR's in the form
of a tubular stack that had the fins inside and the semiconductors on ledges
on the outside. This allowed the use of a single fan that blew through the
tube-like structure where all the fins were located. The assembly was
modular - so it could be expanded (length-wise) to whatever size was needed,
depending on how many components required cooling. The whole thing was about
10 inches in diameter and varied in length as required (usually abut 18 - 24
inches). Reasonably light and easy to mount wherever convenient, and best of
all, they are very efficient heat-exchangers.

I mention this because it sounds like an ideal set-up for a Peltier cooling
assembly, built up to as many units as needed. The incoming air, either from
a scoop or from a fan, need only be ducted to one end of the assembly with
the other end ducted to the cabin.

Don't remember the name of the outfit that makes the things, but they should
be readily available from power heat-sink manufacturers.

Cheers,

Dan Schaefer

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