It uses the acoustic wave to expand and contract pressurized helium, and then conduct heat created from the subsequent pressure oscillation. Source: https://ww

It uses the acoustic wave to expand and contract pressurized helium, and then conduct heat created from the subsequent pressure oscillation. Source: https://www.pv-magazine.com/2023/01/02/residential-thermo-acoustic-heat-pump-produces-water-up-to-80-c https://www.pv-magazine.com/2023/01/02/residential-thermo-ac... Which I just noticed was posted a few hours ago, here: https://news.ycombinator.com/item?id=34233719 https://news.ycombinator.com/item?id=34233719