I thought I would put this here instead of the new thread. When I think of things, I think of batteries. Storing carbon in the soil, storing electricity for a house, carbon stored in fossil fuels, and storing nutrients/carbon in a newly planted tree are all batteries. So what is Paul trying to build? A heat storing battery.
What else could we use this battery for? Livestock! For my purpose, I have ducks. I was thinking of rotating their coop/paddock around my wofati green house in the winter. How would the heat get to the coop? I don't know. A small or large pipe? With a fan? I thought it would be nice without a fan. Paul does talk about a vacuum rod that transfers heat. The rod could just stick in the mass or protrude into the greenhouse.
The animals don't have to be in a specific spot, just where this could work. Am I crazy or is this a good idea?