Exactly. You use the TE device as a fine control element. The fact that it is thermally bipolar makes loop design a whole lot easier. It is also FAST, unlike fans and circulating water.
-John ================ >>The problem with cooler chips is ... > > The Real Problem seems to be some don't have much practical sense. > A peltier would work GREAT, (along with many other simple active ways). > You don't need to make a refrigerator with it. > You just need to just keep the temperature of what it is attached > constant. > One way to do that, is to mount one side of a peltier to a working unit's > heat sink > AND Adjust everything so that the nominal power into the peltier is near > ZERO. > Now it can cool or heat the THING it is attached to just a little to make > up for the room temp variation. > > Then some simple person may ask why bother with the cooling side at all, > why not make it unipolar and just use the heat side, > by using a little larger heat sink on the thing or running the nominal > Temperature a little higher? > > ws > > ********************* > > Hi > > THe problem with cooler chips is that the heat still has to go somewhere. > On the "other side" of the device you need to deal with both the original > 10 or 20 watts plus the heat from the cooler. To move 10 or 20 watts and > get a significant delta T you need a pretty big cooler chip. Since they > are low voltage, that gets you right back to lots of current and thus > magnetic fields. > > The idea of putting the cooler a distance from the cell and coupling with > moving air is still an option though. > > Bob > > > On Dec 24, 2009, at 9:28 AM, Steve Rooke wrote: > >> I wonder how peltier devices would work for this application. Coupled >> with a temperature feedback servo they could be used to heat/cool the >> rubidium. Does anyone know if they have any electromagnetic field >> issues with them, the ones I have seen seem to be completely enclosed >> in aluminium which should act as a Faraday cage. They have the >> potential of providing a large thermal transfer capability compared >> with passive devices. >> >> 73, >> Steve >> >> 2009/12/25 Joe Gwinn <joegwinn at comcast.net>: > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
