Phil Stevens wrote:You could do a few runs to test the efficiency, weighing the wood that you burn each time, to see how close you get to the nominal thermal energy of dry wood (5 kWh/kg). I bet this rig is well over 80%.
Yeah, this is the second time I did this test and the time was the same....
I was thinking about using a killowatt meter and measure how long does my 1200 watt microwave take to boil the same 5 cups of water.... That would give me a good baseline of energy in over time to see how it compares....
I have been thinking of making a thermal mass battery using this method...
The question I have is this... instead of water in the tube, what if I had gravel..... would the chimney effect pull the fire thru large gravel and yield as fast of a heat exchange? Or, what if I used bolts.... I have a section of rail road that I was thinking of putting in and seeing how hot it would get, then perhaps use it to do thermal cooking with heat retention.
I have a stainless steel coil I would like to put inside this and then pump water thru it .... Then I would run that out thru a loop in a barrel with pipe and sand... loops of pipe into the sand then packed tightly. I am thinking I could store that heat in the sand, then use air to pipe it into my home from outside.......
I like the idea of the thermal mass being outside and using it as needed via forced air...