Elastic alloy achieving 20x reversible temperature change when stretched/ compressed, and 90% carnot efficiency in solid-state heat pumping

https://www.eurekalert.org/news-releases/1085154

"vapor-compression heating/ cooling  solid-state phase transition heat pump energy efficiency 50–70% of Carnot limit, overcome utilizing heat generated by elastic deformation (thermoelastic effect) made stronger using [100]-textured Ti₇₈Nb₂₂ martensitic polycrystal subjected to linear elastic deformation for heat pumping... temperature changes of up to 4–5°K (up to 22°K with development of ferroelastic alloys with even higher thermal expansion)... developing prototype for industrial applications"