[mrguyorama]

A necessary part of a heat pump is a way to move the heat away from where it was collected, so that you can either reject it (if you are cooling) or pump it into a space (if you are heating).

How do you do that with a solid metal? Do you have a complicated setup of hot room air blowing over the metal to absorb some heat, and then pump outside air through the same cavity to take away that heat? That sounds mediocre, as air is a pretty crummy working fluid for heat pumping.

[ASalazarMX]

Seems like they designed it as a radiator. Unlike A/Cs, refrigerators don't use fans to dissipate heat, but convection, because don't produce too much heat.

> Teams in Saarbrücken, Germany, have spent around 15 years researching and developing a technology using thin sheets of nickel-titanium to achieve optimal cooling or heating effects in circulatory systems. This includes creating a cooling and heating demonstrator and a continuously operating refrigerator.