Storage / Re: Sand Batteries
« Last post by Bruce S on February 21, 2024, 11:47:42 AM »The little "test" units I built convinced me that going the route of tube-in-tube . Might be called heat exchangers.
My old Mercedes had two copper tubes, one inside the other, I plumbed the outside pipe through my coolant system that in-turn warmed up the bio-diesel.
The guy who bought the car was schooled on how it all worked and why I had two separate fuel tanks.
I'll dig around and see if I still have a pic of the setup.
I found that heating the sand is actually quite easy, but getting the sand to give up the heat was much harder.
So I'm going to rebuild it and use the tube-in-tube heat exchange setup to see if it's a bit better.
I'm thinking of building a heliostat to use the sun directly to heat the sand area rather than rely on diversion dump loads to connected to a NiChr bank heater.
Cheers
Bruce S