Efficient Wood Burning Heater Explained

[@tonyhebert1388]

Make sense, all common sense and helpful to know what I’m looking at when I build mine for my studio and greenhouse.

[@SnowyOwlPrepper]

The pressure is different at each end and along the path. This is a pressure differential, technically not a vacuum. Warm air rises taking heat with it by the process of convection. The mass of the warm air relative to cold air is less for a specific volume. Mass per unit volume is density. Less dense air rises. The energy is two fold. One is the velocity of the molecules of gas, that is heat. The second is the kinetic energy of the mass of the gas moving along the path. One halve the mass times the velocity squared equals the kinetic energy. That is separate from the heat energy. I hope this helps. Also the heat released is from a chemical reaction of oxidizing the wood. More heat is released later by reacting the byproducts of combustion at higher temperatures called pyrolysis. Turbulence caused by the vortex created when channeling the gases allows the oxygen introduced in the secondary air to combine at the higher temperatures more successfully. Mixing is the process name. The math for this is complicated because of the non laminar flow. Remember the refractory insulation radiates the heat back on itself - radiation. Convection moves the gases because of the density is different for warm air vs cold. Conduction is the heat you feel from touching objects that are hot or objects touching one another as in the stove handles connected to the fire box. Peace out!

[@richardmccann4815]

Thanks for the explanation from a slightly different angle, Snowy Owl!

[@voidisyinyangvoidisyinyang885]

this was the BEST explanation of a rocket mass heater that I've seen. Very awesome. This helps me understand my own creation.

[@waynoswaynos]

Friend. it's not gravity that causes the gasses to get sucked up the long straight out pipe... Consider how much space cold air takes up vs hot air. That upper portion is not insulated. So as the exhaust heat conducts to the metal of the flue, the metal radiates to the air surrounding the flue, which creates a steady stream of hot convection currents that transfer that heat from inside the flue to outside it. As that happens the air inside the flue, becoming colder and colder as it rises, takes up much less space than it did in the hottest parts of the stove, and as it rapidly shrinks in volume it creates vacuum below, which in tern sucks more air into itself (and the system) as the pressure equalises. Which is an awesome thing.

[@voidisyinyangvoidisyinyang885]

I think it's called Bernoulli's Principle - yes he basically said the same thing earlier. His point was that it's a constant flow that adjusts itself based on either density change or temperature change. "In fluid dynamics, Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in static pressure or a decrease in the fluid's potential energy.

[@waynoswaynos]

@@voidisyinyangvoidisyinyang885 Thanks, I didn't know of Bernoulli, which is complicated for most people. Even saying "it's a constant flow that adjusts itself based on either density change or temperature change" goes over most peoples heads. My explanation was long but I think quite easy to get a grasp of, when trying to understand the entire fireplace principle. We generally think that we make fire, and hot air rises and that's it, but that is only part of it. Where actually it's a long chain of interconnected events that cycle constantly. Viktor Schauberger teaches about similar things and says despite it's simplicity nobody gets it (including modern science in most cases). He made flying machines based on natural motion not requiring fuel. Like the weather and water cycles that also require no fuel to work in perpetuity.

[@rogeria-p8t]

Hello. What are your thoughts on makeup air? With the being sucked out of the room by the stove, I am sure you will have negative pressure in the room, therefore promoting draft air through any cracks in windows, doors or even small openings in the wall system. Cold air that is.

[@RobertasArtisticAdventures]

You two are so much fun to watch! Love your videos and the vision and hard work you both put into your invention! Have a blessed day!

[@adriaan7627]

After building your bench. How did your theory work out? Does the bench heat up as expected? How prevent the heat to escape through the shimmy when the fire has been put out? Could you make a video in which you do a summery what you have intended and discovered? Did also in relation to the foam made? What are your final conclusions? I’m watching a lot of your videos but there are lot, so what to build according to your latest experiences and science.

[@richuncletrading3167]

Have you thought about a bell bench to avoid having to use the flu through the bench. You could use AirCrete pillars or bricks etc inside the bench or a an aircrete, slate, etc top to the bench as a heat sink. It makes the system much more portable and much easier to build. Just have air coming into bench high and exiting low to exhaust flu...

[@rocktech7144]

Are you still planning to use the heat fin/ aircrete bench layout? Cause if you are, you could cast the bench pieces including the fin and tube as modular blocks that just push together and can be configured into different layouts. Connect with 90 degree or U shaped pieces and fill just that section with gravel. This would make the entire system movable.

[@MrSprintcat]

Diverter valve. Awesome video

[@melinda5777]

Your videos keep popping up about once a day or 2 days.

[@ahmedhasan6145]

Great work! what is the dimension of a vortex and 8 pieces surrounding the vortex?

[@melindaherod7625]

This is the 2nd time I've seen this edio. It is one of my favorites! You do explain things very well. Thank you so much for sharing!

[@human1s]

@Honey Do Carpenter and anyone really interested. First; I admire anyone who is a doer and maker. That said, there are so many things in this construction and explanation that don't make sense. I would love to hear why I'm wrong in my assessment of this. My questions are frank and should be of value for all of us so we don't waste time, money and energy. They are not meant to put anybody down. So, the first thing to note is that just ANY ol' camp fire "works" as a source of heat, so of course this RMH construction "works". The question is if it is *efficient* compared to other solutions; does it faster convert the energy in the wood into useable heat? Potential problems: - The very "mass" used; The idea with the mass is to have many molecules that take up the molecular vibrations (a.k.a heat). But "foamcreate" has subtantially less mass than e.g cobb and AFAIK one main point with foamcrete and similar is *insulation*, i.e to NOT take up heat! The hot air passes by without giving off it's heat energy. This makes me wonder what the exhaust air temp is? Can you put your hand there? (ideally can you put your hand where the air leaves the house). It should be "cold". - Further, how much energy is actually extracted from the wood? Is the wood *totally* burned up? An indication that this is not the case is seen in the (few!) videos showing the burn. Maybe I(!) am wrong but the burning just doesn't seem very rockety/drafty compared to "regular" RMHs. If it is not "fully rockety" with oxygen rushing into the fire, then you don't extract the energy efficiently. Another indication of "poor rocket" is the fact that you're using a lot of metal in this construction. This is just not possible in the "regular" RMH builds because they're so efficient that the metal actually melts/corrodes. That may not be desirable per se but, again, just to make wood burn is not the aim here. Again, please don't take this as negative critizism. I hope we can all find what works in this as I hope to build one of these things myself one day. Cred to Mr and Mrs Honey Do for generously putting up videos!!!!

[@zeroexea]

I have no idea if anyone on here can answer this but it would be nice if anyone knows someone I can go to to get a efficient rocket heater designed for me. it'd be custom because it would be for a tiny house and I actually want there to be a viewing window but I figured why not try . Of course I can build it I have access to materials and tools but I don't quite have the know-how to make sure it works right

[@drsunshine1]

Please when your inside (and there 's no sunshine) put off your sunglasses! Keep up the good work!

[@landofthefree2023]

Then you would know he is stoned

[@krzysztof7704]

nie może bo ma podbite oko

[@pucketts57]

Hi Loving your videos as always Had to build a shed in order to have a decent place to make the forms for my rocket mass heater Ill be back home soon to start that I think Ive seen this video before but dont care Ive watched I think all of them & dont mind repeats of yours one bit I was talking to the building inspector about some other things I got going on & mentioned the rocket mass heater Hes saying Ill need a permit & inspection for it but I am still going to build it & try it out before I install it & get my inspections on it done Always good going back to make sure Im doing it right Love you all for your efforts

[@johnwyman6126]

At 13:50 you changed from rocket mass heaters to something about tubing and valves so fast it made my brain split in half and drool out my ears. What kit, for what? Next time please give us a Segway, and tell us what you're talking about. Thank you.

[@marktheunitedstatescitezen185]

Thank you

[@wisewoman7906]

I see where the air intake is, but where is the wood feed? Unless the air intake door is hinged?

[@poke_hoard422]

So it's the same thing as a furnace just keeps the heat longer vs shooting it out into the atmosphere

[@hehay10]

i know this is really old I tried emailing you about plans for your stove and never got a response. was hoping to find out how to get the plans to build this

[@tomcondon6169]

I was following along, (I was wanting the math about the different aspects), but you went from an explanation of your system that used no flexible hoses and valves, to showing us flexible hoses and valves. I assume you have a series on this, that looks like what I want. I am having thoughts, like a stove attachment so it can be used as a stove. Other things, all in time.

[@jasonbirch1182]

Only problem with the vacuum pulling from your quarters and not outside us that it pulls cold air in from outside through any leaks in the cabin.

[@TheRebelmanone]

"whats that cat doing?" lmao

[@kevinjohnson5060]

what is the name of that valve, flapper valve only brings up toilet flushing units. would a backdraft valve work instead?

[@kenoguy10]

flue damper

[@karate4348]

Sunglasses?

[@mrbizi5652]

Have you looked at HempCrete? Would that work?

[@tubularguynine]

Great 'splainin', Ricky! Good night, Lucy! 👍🏻

[@pakcom-vl9kd]

This would be great if we could put a water some where to heat water for central heating

[@naterowley8503]

There is a you tube video of someone who puts pex tubing in the cob bench and then uses it for radiant heat. I don't think the video talks about how well it worked out. Just search for rocket mass heater builds.

[@antonitorres5934]

I am looking to purchase your kit or assembled units for my living room. What is estmited cost. I can do assembly. :-)

[@docase4932]

Have you thought about designing air inlet from outside air? Colder air is more dense and causes hotter fire and your not pulling air from inside of house.

[@HoneyDoCarpenter]

yes I am, When I do the complete explanation on the outside shroud and sheet metal lay out I will show alternate options such as gravity pellet feeder, outside air intake, ect

[@smpbiker9233]

Can one stove work with two heat benches? So you could have stove in a Florida room and inside so it would work for here better?

[@HoneyDoCarpenter]

sure

[@BrianBriCurInTheOC]

Honey Do Carpenter Is that Sure, I hope so Sure, I think so or Sure, I'm not sure

[@smpbiker9233]

I say install one of these in my yard to cure Floridians of winter!

[@ihk334]

When talking about the vortex you should study Viktor Schauberger, Austrian Physicist that is the source for most of the current available data regarding vortex action. Like your ideas.

[@glennp2288]

How long before your stove is on the market.. ???

[@HoneyDoCarpenter]

I already sold the first one. Pre orders will be available as soon as our Kickstarter launches. Deliveries will be within the 1 year time frame. Thanks HDC

[@gerrys6265]

From what I see, this is pretty much the same as any other mass rocket stove batch heater. They all create a vacuum if built correctly - that is why they all work then. So still not sure what is different here that he says is unique.

[@TheKlink]

11:52 could you use a kettle clicky thing for that? Also, you've got the secondary air inlet and the burn chamber behind the air dampener, doesn't that defeat the point? won't they be fighting for the same air? if they;re fight for the same air would they still super-oxygenate the riser gasses? also, if the secondary air passed the constriction without restriction wouldn't that increase the negative pressure, like a paint sprayer? is it possible to have too much negative pressure in that spot, requiring a dampener for the secondary air? is there no benefit to separate dampening of the secondary air and the burn chamber and is that why they share the same dampener/air source?

[@HoneyDoCarpenter]

WOW! These are all great concerns, You truly get it. I am putting together a platform to allow all contributors to get credit for their contributions. I expect as this thing evolves over time you will be an incredible contributor. As for the gasification chamber and the vortex chamber competing for the same air, I have done this on purpose. It operates on the same principal as the regulator bulb on the back of my Foam Mate only it is backward. Instead of positive pressure from a compressor it is negative pressure created from the rocketing of the gasses up the riser. the air space behind the damper and in front of the burn chamber is critical. Although both draw from that same source of negative pressure they draw at different speeds and pressure rates as the negative pressure in the vortex is greater because the gasses must past by the restriction plate before that point.The burn chamber acts as a wide spot in the river of air flow and the air moves much less rapidly through there compared to the vortex intake. Hope this helps HDC

[@TheKlink]

Honey Do Carpenter so there's a specific ratio to the cross section area of the secondary air and the burn chamber?? And thank you for your kind words, I've got no background in anything like this, but this stuff provides great thought experiment fodder.

[@smpbiker9233]

Kit? Are you and the Mrs. in the kit?

[@philliptoone]

As an engineer I find your explaination of things fascinating because you seem to understand the fundamentals of what you are talking about well enough to apply them to what you are doing but you are technically wrong about some minor details. For example at 3:31 you say that gravity is a force of friction when a car travels up a hill and that it goes away when you travel down a hill. But gravity actually works like an energy storage device in conjunction with an elevated object similar to how a spring or a capacitor works because you get all of the energy back when you travel down the hill.

[@HoneyDoCarpenter]

Thank you so much for your comment. If I said that you are correct. I meant that it is a constant force of resistance along with any friction loss or atmospheric loss like wind resistance. Whether the force is behind or in front of a mass it is a constant. I was only using that as an example of force or energy Pushing a mass and apposing forces resisting that and how at some point you get to an equilibrium. I was trying to articulate this for the lay person as best I could. I was also trying to drive home the point that in a stove like this the pushing forces or energy that drives it is heat energy and that it diminishes through out he process and causes deceleration. I also wanted to explain that when the apposing forces are removed acceleration is possible. Also I wanted to drive home the point that in a traditional un-insulated stove pipe the heat energy pushing the gasses can dissipate so quickly that not only is acceleration not possible but that it steadily slows while going up the pipe as the energy pushing diminishes and the apposing energy stays the same. I don't know how good of a job I did. I am better at articulating these types of thing in writing and that is partly why I am going to start a monthly news letter for insiders. I find it easier to talk with Engineers like you. I am well aware of Moore's law X-Y graghs, Rathkeal's laws of Torque, fXD=T, Positive rotation, negative rotation, fulcrum points, as well as how direct or indirect forces work in these equations with the pythagorean theorom, sin,cosin,tangent. ect. But I find it hard to even talk to my wife about these things sometimes. During the housing and infrastructure boom in the mid 2000's There was a shortage of Engineers. My Brother told me that I could go to work as a Field Tech. If I could get Certified in acute areas of Engineering. I took their tests and was certified in about 8 different areas including soils, aggregate, asphalt, concrete,embankment, waterproofing, Hydraulics, ect. After about 18 months a position opened up in the Soils laboratory and whats even more crazy is I was competing with people who had masters degrees in Geology. I was awarded the position because of my command of soils mechanics, Hydrolics ect. I really believe they chose me because I could do the work and they could pay me much less. But whatever....... However, I want to make it clear that I am at best a self taught amateur mathematician with only a high school diploma. I worked for several more years until the recession hit hard around 2011. My wife and I ran across all of my certifications in the basement when we were cleaning last month. They are very professional looking on high quality paper with the ribbon boarders and every thing like a diploma or something. Mrs. Hoey do says I should get them framed and put on the wall in my office when we get our property. We will see. I Hope you will be an insider and contribute your Ideas and expertise. Much appreciation HDC

[@philliptoone]

@@HoneyDoCarpenter Also, it looks like the upper air channel is a preheat for a secondary burn unit but it does not have flow restriction independent from the main burn?

[@philliptoone]

@@HoneyDoCarpenter Finally, do you have a good build video for the system depicted here or is this a new concept. Sorry to ask but your videos are a bit long and this makes it a bit hard for me to find the specific details I am curious about.

[@HoneyDoCarpenter]

There is a flow restriction plate at the base of the vortex area to create a negative pressure in the vortex that will draw preheated fresh air in for the secondary burn

[@HoneyDoCarpenter]

I have sold my first one and am putting together the build videos right now. This is not a concept as the vortex restrictions dimensions and all other pertinent math with regard to the function of the stove remains the same as my first prototype. I have only changed the shape. For instance even though the down draft shroud is square and not round the exact number of cubed inches of volume within both down draft units is exactly the same. As is the exact number of square inches of radiant area.

[@BerroPower]

Same principies of Peter

[@melinda5777]

Lmao! You guys are FANtastic!

[@HoneyDoCarpenter]

correspond with the {Honey Do Carpenter} and get access to exclusive updates, news, videos, ideas and information. Go to my website honey do www.honeydocarpentershop.com/ and sign up for our news letter and Idea exchange. Thanks HDC

[@melinda5777]

I did. I can't see anything in the drop down menu on the right of the screen. It the page won't open on anything I click on. I hope you get this. Its happened 3x now.

[@ziadalgorashi8485]

5:36 lol

[@hanyhamad1534]

صباح جميل عليك

[@mervynshute880]

too much metal.cold and sterile. aircreate with a water coil. incorporating a cookstove. any room left? maybe room for a mass sofa. would suit everyone ...

[@thomasmurray4717]

Start at 2:05

[@HoneyDoCarpenter]

Yaa good place to start for most....

[@Picklemedia]

Chimmy is not on a vacuum. Wrong.

[@smpbiker9233]

Force? Resistance? Be nice to her or you're fried. Get it?

[@HoneyDoCarpenter]

lol.....

[@whatdoiknowjustamortalsoon8633]

R U an ALien? what's with the sunglasses?

[@smpbiker9233]

You lose power up a hill? You need real wheels dude. Be nice to Mrs. Honey Do and maybe she will let you.

USELESS WORD SALAD Just say what you mean without the dumb and wrong examples. Constant force like gravity blah blah omg just plz

[@roseloos9824]

Less talking

[@camocamo8888]

麻烦照应下非英文客户，少些嘴皮，多些图例

[@HoneyDoCarpenter]

what ever that means.. LOL

[@clintonm2117]

the reason for the glasses is simple. So much bullsh*t. And btw... it's *not* your invention, simply your variation on a design.