We made this unit as a self-contained box, one that could be disassembled if necessary (mainly due the fact that is was a prototype). For more of our ideas and projects, please visit our site. So, if you do build one of these, follow these plans exactly or research what things may change with a different flue size. The greater area you have, the taller the heat riser should be, as well. The burn chamber (the horizontal area where the flame is) should be the smallest cross sectional area of the entire system. The cross sectional area of all parts of the system can be no bigger than the cross sectional area of the flue. ![]() If your house has a different flue size, then components will have to be rescaled. ![]() This RMH is based around a 6” diameter flue. Still, we’ve made that money back in the time and energy saved in collecting and cutting firewood. All in, it cost us $150, though an adobe one would be considerably cheaper. Or you can use the principles we outline to create your own unique heating device. This design can be modified to suit your space and needs. It will make a huge difference to your home and your woodpile. If you use wood to heat your house, you should definitely consider making a RMH. The only disadvantage is that it takes more work to make one than just going to the store and getting a pre-made stove, but it seems like a relatively small price to pay, especially for the Makers out there. We use a fraction of the wood we used to, we can burn a far greater variety of biomass, and the heat lasts a lot longer. However, for those cloudy, cold days, this stove has been a huge hit. We made the RMH we’ll be describing in this article to fit an existing space, and it has been working great! As long as the sun comes out in the day, we rarely need a fire, as we designed the house to make use of solar gain. If we’d known about it sooner, we would have built an RMH encased by an adobe bench or something similar into the design of the house. By the time we started researching the benefits of an RMH, we had already built our house and had a regular wood-burning stove in place. For example, if we have a fire going for just a couple of hours in the evening, the stove will still be hot in the morning. Although it takes a while to heat up, that heat will last hours after the fire has been extinguished. As biomass is burned and the RMH is heated, it transfers heat to the thermal mass (adobe, dirt, sand, even water). The second factor that makes an RMH so superior is the thermal mass that encases the components that heat up. This also results in there being less ash and smoke. An RMH can consequently be up to eight times more efficient, requiring less wood for the same amount of heat. One is that the combustion that takes place is far more complete in an RMH, due to the increased draft and insulated burn chamber. ![]() I’ll be using his specs to create the concrete foaming gun, and modifying from his prototype of a light weight mass heater separate from the rocket stove.There are two main factors that differentiate a Rocket Mass Heater (RMH) from a regular wood-burning stove. This is borrowed from another solid innovator, The Honey-Do Carpenter. My design is a hybrid, as the stove will stand alone, as will the mass-heater. I found the best understanding of the forces at work were from Masonry Stove builders, in particular Walker Design, who offers a J-Rocket core design to keep us diy dinks from burning down the ranch house. Refractory material is the only media that can survive the temperatures in the core and stack. Essentially it rusts without oxygen, or more precisely it is the effect of reshuffling the iron molecules wherein they lose covalent bonds and layer like sheaves of paper. At 1500 to 2000 degrees in an oxygen depleted environment, steel undergoes a process called spalling. Many cores are created with bare steel using old gas canisters. The interwebs are awash with bad Rocket Stove designs.
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