News for hackers. Stuff that matters.

A comment on CO2 Batteries That Store Grid Energy Take Off Globally. Parent comment

Re:CO2 Batteries That Store Grid Energy Take Off Globally by nine_k on Monday December 22, 2025 @11:53AM (#46355839)
The system actually sort of uses the atmosphere as an ambient heat sink (when compressing) or heat source (when expanding).

I wonder if that heat could be stored in a more sensible way, e.g. as heated water in a tank near the bubble. This could improve the efficiency figures at short repeating patterns (charding at high noon, discharging through the night).

[ Parent | on HN ]
Re:CO2 Batteries That Store Grid Energy Take Off Globally by anotherpaul on Monday December 22, 2025 @12:09PM (#46356045)
As far as I understand they do try to keep the heat around for the next decompression. As of course they need it. But I could not find what type of heat storage they use. Ultimately they "only" seem to need to store it for 12h, right?
[ Parent | on HN ]