yeah you put it in a barrel, pump hotter oil through coiled pipe, hot (storage) oil floats to top, when you draw heat through another coiled pipe cold oil falls to bottom. just put mineral wool around it. much cheaper than batteries
solar water heaters work the same way except they use water
concentrated solar heating gets you there using 1/4 of that space and allows for simple energy storage
“simple” storage of burning hot oil mmhm
yeah you put it in a barrel, pump hotter oil through coiled pipe, hot (storage) oil floats to top, when you draw heat through another coiled pipe cold oil falls to bottom. just put mineral wool around it. much cheaper than batteries
solar water heaters work the same way except they use water