You’re teaching me all kinds of shit today.

I knew they mined a bunch of lignite but I was under the impression they exported most of it.

Thermal mass would be secondary for the sand. I’m more concerned with it helping the structure of the tank underground and avoiding slump from what the tank would be buried in. Probably feeding it heat from a thermal solar set-up.

Curious what they’re using for a transfer liquid. Are NaK or sodium systems pressurized to handle that?

Alright so I have a question for you. Let’s say I’m designing one of these things for a greenhouse or something. I’m thinking underground storage tank of 500 gallons or so but basically filling it with sand and then again topping it off with water. It should minimize convection currents in the water and where it there isn’t much of a thermal draw there shouldn’t be much of an issue right?

How are you getting your sand that hot?