I am using this peltier device to ramp an aluminum plate down to -10C in a vacuum environment. I chose this particular device because it had the largest 'Qout' of any single-stage peltier I could find (400W!!), however I am having a hard time achieving my goal of -10C.
I am generally operating at about 20V and 14A with a large heat sink on the back (3"x3" Al water block feeding to a 10-gal ice water reservoir AKA fishtank). In this configuration, I can usually achieve between -5 and +2C, but never -10C.
Now I wonder if I would have better luck using a multi-stage peltier? Still becoming familiar with the technology, but from what I can tell, you tend to sacrifice Qout in exchange for increasing dT and vise versa.
If so, could I expect to see my cold-side temp drop if I switched to something like this?