On Fri, 2004-01-16 at 13:53, Jake Anderson wrote:
> a peltier will shoot for roughly 65C temperature difference hot side to cold
> side.
>
> A peltier that pumps 72W of heat will also produce 72W of heat (IE 144 watts
> must be disipated from the hot side)

Actually I believe (or I might be very wrong...) a peltier will produce
more power than it is pumping from the cold side due to heat also being
produced internally in the plate.

I did a project once where I cooled a metal plate to about -25C it took
3 stacked peltiers to get that low. The most tricky part was to actually
'tune' the three plates (in terms of current and voltage) to get them to
work the best. I only used air cooling at the hot side for this
application. Using water would probably lower that temerature
significantly. Remember to get silicon sealed units if used for cooling.
Water could kill them quickly...

One place tor more information: http://www.melcor.com/handbook.htm

Xyvind

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu