Oops.. Then I misread your mail..

Xyvind

On Sat, 2004-01-17 at 14:16, Jake Anderson wrote:
> that's what I said
> a single Peltier running using 72W of electricity (common size) will
> dissipate at a maximum 144 watts of heat from the hot side. 72 watts from
> the power in then 72 watts pumped from cold to hot side, as far as I am
> aware.
>
> so if you want to stack them and get optimum cooling you need to have them
> pyramid style. 1x on the first layer, 2x on the 2nd, 4x on the 3rd etc etc.
> the thermal design for such a setup is left as an exercise for the reader.
>
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Oyvind Tjervaag
> > Sent: Saturday, 17 January 2004 1:36 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [EE:] About test boxes (hot and cold)
> >
> >
> > 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
> >
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