I made some changes to this idea. I used a 12V supply from an old PC power supply to run the heat element in the sand. I used some course pool filter sand that I use for my aquariums.
I have a very chilly hallway with no radiator between my lounge and main entrance door.
It did work. Raised the temperature from 62F to a modest 70F. It took a few days to warm through and remain constant.
I see there are developments in Scandinavia to heat entire towns.
I have been following the progress of sand batteries.
So much so that I actaully made one at home.
https://hackaday.com/2022/11/21/making-a-do-it-yourself-sand...
I made some changes to this idea. I used a 12V supply from an old PC power supply to run the heat element in the sand. I used some course pool filter sand that I use for my aquariums.
I have a very chilly hallway with no radiator between my lounge and main entrance door.
It did work. Raised the temperature from 62F to a modest 70F. It took a few days to warm through and remain constant.
I see there are developments in Scandinavia to heat entire towns.
This is the good science I like to see.