On Wed, 11 Nov 1998, Gerry Cox wrote:

> I need to cool an object to 4C below ambient. Ambient is in the range 20C to
> 30C. The object does not generate any heat of its own. Cooling does not have
>
> So I am experimenting with the idea of using a compressed air supply, which
> is available near the device, to achieve the cooling. I.e. from first
>

>From my empirical experience with being whupped on by broken air lines, I
would say that it would be difficult to reduce the temp to 4degC w/ just
a diffuser.

But try doing a web search for vortex coolers.  These use very moderate
amounts of compressed air to generate split streams of very cool and
very hot air.  As far as I'm concerned, they work by magic.  One common
application is to cool personnel that have to work in protective clothing
in devilish environments.

bcs