There’s experimental storages where heat is pumped to underground pools or sand, but as far as I know there’s heat exchangers and radiators to outside, so majority of excess heat is just wasted to outside. But absolute majority of them are closed loop systems since you need something else than plain water anyways to prevent freezing in the winter.
What happens to that heat in summer?
There’s experimental storages where heat is pumped to underground pools or sand, but as far as I know there’s heat exchangers and radiators to outside, so majority of excess heat is just wasted to outside. But absolute majority of them are closed loop systems since you need something else than plain water anyways to prevent freezing in the winter.