[Karliss]

Not sure if that was intention, but fridge system can be split into two parts producing temperature change, and moving the heat. In a typical compressor fridge the gas does both, change the temperature by expanding/ compressing and move the heat by pumping it around. I guess the electrocaloric effect does the first half in solid state. With oil being pumped doing second half in a non solid state way. Isn't system capable of moving heat automatically a fridge? No- you can have a heat mover which is capable to only move heat from hot to cold like a water cooler in a PC.