Of course it works, that's why it's not new ;) https://en.wikipedia.org/wiki/Thermal_energy_storage https://en.wikipedia.org/wiki/Thermal_energy_storage It's

Of course it works, that's why it's not new ;) https://en.wikipedia.org/wiki/Thermal_energy_storage https://en.wikipedia.org/wiki/Thermal_energy_storage It's just a different heat transfer fluid (and a very well known one).