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Post by apehead on Feb 12, 2021 7:24:04 GMT -8
Hello, Long time lurker, first time poster. I have an early passive solar house ( John Barnard Ecology House) that is extremely massive (entirely concrete) and relatively large (1700 sqft). As such, I wanted to utilize the existing mass as the heat storage component of the system. Currently, there is an older Kickapoo Home Furnace that is no fun to work with attached to a 40 year old, extremely power hungry, inefficient air handler. I want to build a batch rocket system to burn copse feedstock (1-3" dia round wood bundles) with a jacket connected to the ductwork. Like most conventional forced air systems, the send is from the floor, and the return is through the ceiling. My idea would be to reverse this flow to take advantage of passive convection across the stove heat exchanger, and distribute the heated air into the existing return ductwork that runs through the mass with end point fans. Schematic of ductwork.What are some builds that are designed for intense heating of air rather than mass? Would it be something like a batch core in a barrel? I have two 300gal oil tanks I could use as a bell. Is there also a design that is more tolerant of damp or green wood? Please advise. Thank you!
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Post by gadget on Feb 13, 2021 12:21:23 GMT -8
Allot of the heaters on here rely on the mass also as a way of insulating the burn for higher burn temps. It would be hard to do a batch to heat air because not a tone of heat would go into your homes mass quickly so you might get really high temperature swings between firings that could make it more uncomfortable. A mass heater could actually slow down the temp swings and add comfort.
There may be some newer DC driven blowers that are less power hungry then your garden variety induction motor. I'm not referring to the ECM (electronically commutated) blowers that are mostly for maintaining a consistent pressure drop. I think there are some higher voltage brushless DC blower motors that draw a fraction of the power. My HVAC buddy was telling me about them but I haven't researched yet. I have a water coil in my HVAC that I cool my house using cold well water that I could also use warm water to heat with. I haven't used it for heating yet, I would like to get my blower wattage lower.
Anther option to consider is to go with a warm water coil in your hvac and build/buy a modern high efficiency wood boiler. You could then do a 1 day batch firing to a large storage tank if you wanted.
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Post by apehead on Feb 15, 2021 21:20:37 GMT -8
I thought the core temperature was maintained through the insulating properties of the refractory material or superwool?
My idea was to essentially have a core/riser or shoebox in a barrel in an air duct with convection assisted by end point duct fans driving the heat transfer.
The air heated by the riser barrel would deliver heat to the mass in the ceiling and floor through which the integral ducting runs. A bell made from flue tiles coupled to the exterior wall that the chimney exits would act to warm it and the insulated earth behind it, scavenging residual heat as the exhaust enters the chimney.
Unfortunately, outdoor wood boilers are banned in Connecticut, USA.
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fuegos
Full Member
not out of the woods yet
Posts: 177
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Post by fuegos on Dec 23, 2021 3:05:16 GMT -8
" Is there also a design that is more tolerant of damp or green wood?" in a word no.In my opinion it's an absolute must to have properly seasoned wood or what's the point of having a high efficiency stove ?
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