Solid-state cooling (no gases) by adding small amount of pentaerythritol so molecules rotate/ reorient more gradually and reversibly

https://www.eurekalert.org/news-releases/1118124

"barocaloric materials—solids that absorb or release heat when pressure is applied, suffer from inconsistent behavior during heating versus cooling making inefficient... overcome through subtle molecular tuning using crystal of: neopentyl glycol/ pentaglycerine/ 2 mol % pentaerythritol... reversible refrigeration capacity >70X greater than pure neopentyl glycol... 20X expanded cooling temperature range (>18°K) at 1 kbar... sustainable, high-efficiency refrigeration and climate control systems"

Related: Barocal, a Cambridge University spin-out commercialising efficient, refrigerant-gas-free cooling and heating technology, has raised $10 million
https://www.businessweekly.co.uk/posts/cool-10m-raised-by-barocal-to-target-577bn-market