Rocket stove design7/7/2023 This slightly raised platform makes it possible for air to flow over and under the fuel source.Ĭombustion chamber/Internal chimney: At the end of the fuel magazine where the wood is burned. Fuel shelves serve as the platform for the fuel that is used with the stove. The fuel magazine can be simple steel piping or even ceramic pipe. The fuel magazine can be horizontal where additional fuel will be added manually or vertically for automatic feeding (gravity feed) of fuel. The “internal chimney” creates the optimum amount of draft for fuel-efficient combustion.įuel magazine: Into which the unburned fuel is placed and from where it feeds into the combustion chamber. The use of a cooking hood is recommended as the hood and chimney combination does not influence the rate at which air is introduced to the fire. The exhaust gases then pass out of the building via the chimney. For space heating purposes the heat is transferred to a heat store which can in some cases be part of the structure of the house itself. Rocket stoves are usually insulated and some are raised up from the floor which reduces the danger of children burning themselves. The advantage of this system is that the heat output can be adjusted as required, but the disadvantage is that if left unattended the fire will extinguish. In horizontal feed magazines the fuel has to be pushed into the combustion chamber at regular intervals. Some models can accept whole logs, with only the tips combusting. The design of the stove means that it can operate on about half as much fuel as a traditional open fire and can use smaller diameter wood. The chimney should be insulated to maximize the temperature and improve combustion. As the fuel burns within the combustion chamber, convection draws in new air from below ensuring that any smoke from smoldering wood near to the fire is also drawn into the fire and up the chimney. A Rocket stove achieves efficient combustion of the fuel at a high temperature by ensuring that there is a good air draft into the fire, controlled use of fuel, complete combustion of volatiles, and efficient use of the resultant heat. Click on image above to play GIF animationĪ Rocket stove is signified by ease of construction and simplicity of building materials while accepting small-diameter fuel such as twigs or small branches, yielding high combustion efficiency and directing the resultant heat most effectively. Some models have the chimney located in a different location, drawing emission gases along a horizontal path (sometimes below cooking points) before exiting through the vertical chimney. A Rocket stove is a type of stove combining the air-intake with the fuel-feed slot in an opening into the combustion chamber extending into an “internal chimney” before exiting through the vertical chambered heat exchanger. Both of these functions can be accomplished in a well engineered cooking stove and a Rocket stove. In order to reduce emissions and fuel use, the stove designer’s job is to first clean up the fire and then force as much energy into the pot or griddle as possible. Fire is naturally good at its job, but pots are not as good at capturing heat because they are inefficient heat exchangers. Improving heat transfer efficiency can significantly reduce fuel use. Improving the combustion efficiency is necessary to reduce smoke and harmful emissions that damage health. On the other hand, improving heat transfer efficiency to the pot makes a large difference. Improving combustion efficiency does not appreciably help the stove to use less fuel. But only a small proportion (10% to 40%), of the released energy makes it into the pot. Click here to go to ReferencesĪn open fire, as shown above, is often 90% efficient in turning wood into energy. Find a comprehensive list of Websites, Videos, Downloads and Manufacturers at the bottom of this page with regards to building, using or purchasing a Rocket stove. The Rocket elbow can be made from different materials such as sand/clay ( Lorena), pumice/concrete, heavy steel pipe, 430 stainless steel or refractory ceramic. In the last 29 years, variations of the Rocket stove have been built in over 20 countries. The Winiarski Rocket stove’s simple design and use of common materials make it easily modified for optimal performance. Larry Winiarski, now Technical Director of Aprovecho, began developing the Rocket stove in 1980 and invented the principles of the Rocket stove in 1982.
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