An electrocaloric heat pump that is more efficient than conventional air conditioners

https://techxplore.com/news/2023-11-electrocaloric-efficient-conventional-air-conditioners.html

"fluid-based... laid lead scandium tantalate strips atop one another, then in silicone oil selected for heat-carrying properties, then heating with electricity pushing fluid in one direction, and then pushing it the other way when it cools down—the region of difference, they found, was approximately 20°C. To use the device as a heater or an air conditioner, oil is circulated through the system. Testing showed the device capable of reaching 64% of Carnot's efficiency—the theoretical limit of devices using such technology"