Comment Re:What's the delta temperature? (Score 1) 160
Peltier systems work similarly,
Nope. Different system entirely. Moving charge carriers carring differenct amounts of heat between hot and cold ends, vs. locked-in-place atoms becoming more or less spin-aligned, and hotter or cooler, as a field is applied and revoved, with the heat moved to the hot end or from the cold end by a pumped fluid.
You can add a little heat, or pull out a little heat, but it's not gonna make ice in the desert.
Or you can stack them in series in a shrinking pyramid and reach cryogenic temepratures. (Such coolers are used for some infrared cameras to cool the sensor so it can detect cooler things.)
But Peltier systems are mostly not used when there's room for other solutions because they're terribly inefficient,