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Corey - is that fibure of 0.2 btu/lb/ºF only for brick or does it apply to most stone/masonry? Just curious in general.
Related topic - I was noticing as I played with the IR thermometer just how much the walls (and other things) around my stove warmed up and retained the heat for a while after the stove was cooling. With stove down to 250 top temp I realize it was still radiating some, but the room air temp was reading around 75. Walls were reading high 80's so I imagine that they were helping to keep the room warmer. My thought (and point) being that everything in the room is absorbing that radiant energy and will release it over time as the stove cools down. I think someone in another thread suggested heavy furniture such as a stone table etc around a stove for a cabin to help preserve heat - perhaps that isn't such a bad idea, but I guess unless you make your stove room look like the Flintstone's cave you still won't really achieve long-term heat storage...
Maybe a very large tropical fishtank in the wall behind the stove with very tolerant (or fake) fish?
For years my large ranch style house was like a public aquarium. Only furniture was a bed and kitchen table along with a few chairs. Those year I was not able to run the stove but did figure all those big tanks running at 82-85 degrees had to be doing something besides raise my electric bill.
I know man has used stones forever to keep them warm at night. There has got to be the perfect stone out there somewhere for maximum heat absorption that slowly releases it's heat.