News for hackers. Stuff that matters.

A comment on French startup unveils new residential thermo-acoustic heat pump. Parent comment

Re:French startup unveils new residential thermo-acoustic he... by Someone on Wednesday January 04, 2023 @03:27AM (#34243350)
FTA: Because helium remains a gas until -200 C, we can achieve higher temperatures inside our heat pump core

N₂ boils at −195.8 °C, but that will be higher at 30 bar.

Next question: why do they need gas at lower temperatures to achieve higher temperatures? Do temperatures inside that acoustic wave vary that much?

[ Parent | on HN ]
Re:French startup unveils new residential thermo-acoustic he... by BlueTemplar on Wednesday January 04, 2023 @03:51AM (#34243465)
Probably because the higher delta allows for higher power density and keeps the device reasonably small ?
[ Parent | on HN ]