Larry Winiarski's Rocket Stove Principles. Larry Winiarski's Rocket Stove Principles.
Dean Still, April 2. Dear Friends,I was typing up Larry's latest simple stove principles for Aprovecho'snewsletter, .
I've tried adding heated secondary air into the top end of the internalchimney above the combustion chamber but haven't noticed an improvement inamount of smoke or in fuel efficiency. I ended up thinking that enoughprimary air is left at the top of the combustion zone anyway. Adding air mayjust reduce temperatures. I'll test this further with better equipment. The Rocket stove is trying to create supportive conditions for completeinitial combustion which seems to pretty much work when the right amount offuel is introduced. The added draft created by the insulated chimney abovethe fire pulls in lots of air, which like a fan, makes a hotter, vigorousburn.
Anyway, here are Larry's principles of stove design: Best,Dean. Rocket Stove Principles.
Dr. Larry Winiarski. Technical Director. Aprovecho Research Center. Apro@efn. org. 1.) Insulate, particularly the combustion chamber, with low mass, heatresistant materials in order to keep the fire as hot as possible and not toheat the higher mass of the stove body. Within the stove body, above the combustion chamber, use an insulated,upright chimney of a height that is about two or three times the diameterbefore extracting heat to any surface (griddle, pots, etc.). Heat only the fuel that is burning (and not too much). Burn the tips ofsticks as they enter the combustion chamber, for example.
Rocket in Space Under the influence of the rocket thrust in a gravity-free environment, the resulting velocity can be calculated from: First rocket equation. ROCKET IMMUNOELECTROPHORESIS AIM: To estimate the unknown concentration of antigen or antibody by Rocket Immunoelectrophoresis.
The object is NOTto produce more gasses or charcoal than can be cleanly burned at the powerlevel desired. Maintain a good air velocity through the fuel. The primary Rocket stoveprinciple and feature is using a hot, insulated, vertical chimney within thestove body that increases draft. Do not allow too much or too little air to enter the combustion chamber. We strive to have stoichiometric (chemically ideal) combustion: in practicethere should be the minimum excess of air supporting clean burning. The cross sectional area (perpendicular to the flow) of the combustionchamber should be sized within the range of power level of the stove. Experience has shown that roughly twenty- five square inches will suffice forhome use (four inches in diameter or five inches square).
Commercial size islarger and depends on usage. Elevate the fuel and distribute airflow around the fuel surfaces. Whenburning sticks of wood, it is best to have several sticks close together,not touching, leaving air spaces between them.
Particle fuels should bearranged on a grate. Arrange the fuel so that air largely flows through the glowing coals. Too much air passing above the coals cools the flames and condenses oilvapors. Throughout the stove, any place where hot gases flow, insulate from thehigher mass of the stove body, only exposing pots, etc. Estimate the size of the gap by keepingthe cross sectional area of the flow of hot flue gases constant. EXCEPTION: When using a external chimney or fan the gaps can be substantially reducedas long as adequate space has been left at the top of the internal shortchimney for the gasses to turn smoothly and distribute evenly.
This istapering of the manifold. In a common domestic griddle stove with externalchimney, the gap under the griddle can be reduced to about one half inch foroptimum heat transfer.