harry kaneer

The technique for cleaning would work fine. I question the use of clothes dryers at all. They wear out the clothes faster consume electricity and natural gas for an unnecessary activity as well as anti-static sheets and sometimes perfuming sheets in case the clothes still have an odor. Solar power clothes dryers are far cheaper, far more energy efficient and they clean any left over odor out of the clothes as they dry. Solar clothes dryers are call close hangers hooked on a line or clothes lines. Additionally they require no clearing of lint.

I will likely buy the book but what is the cost?

Big Al,
From Wikipedia:
"....fired kiln, more porous bricks, commonly known as "kiln bricks" are a better choice.[1] They are weaker, but they are much lighter, easier to form, and insulate far better than dense bricks. In any case, firebricks should not spall under rapid temperature change, and their strength should hold up well during rapid temperature changes."

What ever the terminology the porous bricks reflect heat the dense ones pass it through. Building shippable core that will pass the heat through itself and spall the concrete below it is far too specialized a piece of equipment for the average person. Also anything designed to accept such temps will result in disaster in a lay persons hands. Additionally putting dense bricks under the shippable core simply allows the heat through to the wood as that is what those type of brick were designed to do. That is what most ceramics are designed to do. IF the fire bricks were "popping" as was indicated in the videos then temps exceeding the bricks ratings were being achieved. This needs to be corrected or less educated individuals will end up causing themselves problems. This should have been posted in the shippable core section but I am not all that familiar with the posting tools.

H

Big Al,
From Wikipedia:
"....fired kiln, more porous bricks, commonly known as "kiln bricks" are a better choice.[1] They are weaker, but they are much lighter, easier to form, and insulate far better than dense bricks. In any case, firebricks should not spall under rapid temperature change, and their strength should hold up well during rapid temperature changes."

What ever the terminology the porous bricks reflect heat the dense ones pass it through. Building shippable core that will pass the heat through itself and spall the concrete below it is far too specialized a piece of equipment for the average person. Also anything designed to accept such temps will result in disaster. Additionally putting dense bricks under the shippable core simply allows the heat through to the wood as that is what those type of brick were designed to do. IF the fire bricks were "popping" as was indicated in the videos then temps exceeding the bricks ratings were being achieved. This needs to be corrected or less educated individuals will end up causing themselves problems. This should have been posted in the shippable core section but I am not all that familiar with the posting tools.

H

allen lumley wrote:Harry Kaneer : You have a clear grasp on 90% of the information, which was a requirement to be 'elevated in grade above his (always his ) peers in evaluations!
How ever the Fire Kiln brick is the heavy and dense brick, which has the high conductivity (and retention!) The lighter weight brick has/have many ,
many trapped air pockets and act primarily as insulation, at higher temps the insulate properties of the lighter brick cause it to shed heat energy back towards the
source as reflected/refracted energy!

I am actually a little vague here myself, there is a point around 2400*f where we start creating the NO, NO2, NO3s that are a further worry to the health of this Planet
and ALL her Children, 3000 degrees without Oxygen supplemental augmentation is probably impossible but also not really needed, which is not to say a specific
region can't reach those temperatures as an isolated region- possible forging of iron !! Certainly a Rocket Mass Heater that quickly reaches temperatures in the low
2000 *F such be sufficient for 97% of All RMHs ever Built ! For the craft - Big AL !

If my nomenclature is correct (Kiln brick is the light weight while fire brick is the heavy weight) thermal conductivity means the ease with which a material transmits heat through itself. A high thermal conductivity will pass the heat straight through and that would explain the spalling in the concrete under the shippable core. If kiln brick, which has a low thermal conductivity, were used under the core it would reduce or eliminate the spalling of the concrete. Also
the temps reached are a design factor that causes a large amount of oxygen to be consumed much like the venturi in a carburetor of a super charged engine.
For home heat purposes is 3000F a good idea when it is inside a building loaded with accelerents? A design that would produce no more than 2000 seems sufficient for home use and thus both kiln and fire bricks can be used in combination with fire clay as slip. Everything will burn if the temp is high enough.
My experience is with Army wheeled vehicles and 500HP Scotch Marine boilers.