A more environmentally friendly air conditioner
https://www.acs.org/content/acs/en/pressroom/newsreleases/2022/august/a-more-environmentally-friendly-air-conditioner.html
"metal tube packed with solid refrigerant and inert water or oil... hydraulic piston applies pressure to liquid... liquid helps transfer pressure to refrigerant and carry heat... barocaloric materials... functional refrigerants, turning pressure changes into temperature-changing cycles... doesn’t use pressures as low as commercial refrigeration systems... first working cooling system using solid-state refrigerants that rely on pressure changes"
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