calling HVAC guys or appliance techs
I believe it may work on the same principle as this portable cooler.
Peltier cooler. They are used occasionally in high-high-high end PCs.
Peltiers work by applying DC current to a plate and one side gets cold and the other really hot. They’re horribly inefficient compared to standard refrigerant units, but the Peltiers can be downright tiny.
Thermoelectric cooling - Wikipedia - wiki article on them.
Probably absorption refrigeration …I have one in my pop-up camper.
Probably something based on a peltier cooler. Often not terribly effective, but can get the job done depending on the load. I had modded a Cocacola 6 can cooler at one time that could get the cans near freezing, but the fan was loud and it probably wasted a lot of power. Eventually, the peltier chip burned out, twice. Never bothered to put the third replacement in.
KuoH
interesting about the absorption cooling, is that what a mini-fridge uses?
No. The fridges that flashination posted use Peltiers like I said in the second comment.
Am I invisible?
Yep, peltiers. There’s a $3 one if you wanna tinker with it and see how it ticks (remember you need heatsink):
TECs (Thermoelectric cooler) / peltiers suck as a fridge. At best they can only cool a certain amount below ambient temperature. Fine as a portable cooler if you need it light & small but don’t buy a TEC mini “refrigerator”.
GE seems to be making progress with magnetic refrigeration. Hopefully small & light will be possible.
Who said that? 