4 ms·

> you can't really do -600C sand (or anything) You can if you stagger AC/HP or even peltier elements.

• myrmidon 1y ago
  You misunderstood-- temperature is physically limited to -273°C, this is not an engineering problem. You have a smaller usable temperature range in a "cold storage" than with heat from fundamental physics alone.
  • dzhiurgis 1y ago
    Damn you got me there!