Comment on Grid-Scale Bubble Batteries Will Soon Be Everywhere
HaraldvonBlauzahn@feddit.org 1 day agoCompressing gas generates heat, and a significant part of that heat will be lost. Heat dissipation is itreversible, and this lowers efficiency a lot.
BTW the same reason why in industry, pneumatic drives are universally replaced by electric motors: Their efficiency is too low.
fullsquare@awful.systems 21 hours ago
There is a thermal energy storage included as s major part. This works because compressing CO2 to 55atm adiabatically heats it up to some 450-ish C, so that heat is pretty high grade, and only the final stage cools it down with heat exchanger open to air. In discharging direction, some heat is taken from outside air to evaporate part of CO2 and heat stored is used up