Paul,
With respect, you are a clever guy who takes a great deal of initiative but forgive me for again asking for a sketch, digitially photographed or scanned, sent out to Alex English´s site. I do a lot of prototype development and cannot discern the necessary information to actually make one. PLEASE !!!
Alternatively, I will be driving back to Ashland Oregon in a few days ariving by mid january. Perhpas you could just send a fax of a sketch to our house when we get in )question mark here I am on a espaniol keyboard in a funky internet cabin in Comitan where there is no English formated keyboard available....
Anon, Richard Stanley, LFound.
PS., I like the name
>From: psanders@ilstu.edu
>To: stoves@crest.org
>CC: psanders@ilstu.edu, bobkarlaweldon@cs.com
>Subject: Juntos (together) stove !!! This works!!
>Date: Mon, 31 Dec 2001 09:58:09 -0600 (CST)
>
>Juntos ("together") Stove report.
>
>This is a new design and it works in initial trials.
>
>After my December Africa trip, I am back in frozen Illinois doing stove design work.
>
>Ambient temperature 20 F ( -5 C), snow fluries, light wind, unprotected/unshielded stove and aluminum pot, and I boiled a liter of water in 5 minutes. I am happy (but also glad to get indoors to write the report.)
>
>I have already named my new stove. “Juntos” means “together” in Portuguese (with a soft “j” sound like the “ge” in protégé. Or in Spanish with the “h” sound like in a political junta, making it sound like: “hoontos” but not “hunt-tos”. In either language, it still means “together” and is understandable by English speakers because of the “junta” term.
>
>Components of the Juntos stove:
>
>1. Basket-shaped metal grate ala New Dawn – Crispin PP
>2. Rocket stove (small version) ala Aprovecho – Dean Stills
>3. True gasification unit ala Reed-Larson
>4. Can burn briquettes ala Legacy – Richard Stanley
>5. Air-pipe ala Paul Anderson
>
>Includes pre-heated secondary air,
>TOP lighting AND BOTTOM lighting sections,
>Fast initial heat,
>Long-term slow heat
>Smoke-less when operational, almost smokeless at start-up.
>Tincanium materials with probable mud and brick options,
>Projected cost to be under $10 per unit, maybe under $3 if not counting local labor and materials
>But we could also have the “top of the line model” with $100 value (chrome plated and nice handles, etc??)
>Burns most biomass fuels
>
>And this is NOT an April Fools joke. It really does work. I have made and tested two of them.
>
>Think of layers of tin cans, each can has about a 6 minch diameter and a 7 minch height.
>
>(Oh, by the way, I like the metric system, so I have invented the “minch” unit, which is a
>METRIC inch.).
>One minch is exactly 2.50000 centimeters (not the 2.5415…..cm in the English inch, which probably should be called an “einch” )
>
>So multiply the minch measurements by 2.5 and you have the centimeter sizes.
>
>4 minch = 10 cm
>5 minch = 12.5 cm
>6 minch = 15 cm
>7 minch = 17.5 cm
>8 minch = 20 cm
>40 minch = 1 meter
>and 0.4 minch = 1 cm.
>
>Anyway, back to the stove
>1. The lower or bottom unit is a tin can (I prefer a “gallon paint can” because it comes with a lip at the top edge) with about 6 minch diameter, open at the top, and with plenty of air holes at bottom or around the lower outside edge. It would be nice if this lower can could be about 10 minch tall (see #2 below)
>
>2. Insert a “basket grate” (ala Crispin) that is open at the top (diameter just under 6 minch) and has a lip that seals reasonably well with the top of the lower can (#1). The bucket height needs to match – ( that is, fit inside) - the lower can. I like Crispin’s basket grate that is about 9 minch high, so I needed to have an elongated lower tin can for one of my initial stoves. I made a longer can by taping a second can underneath.
>
>3. The basket gate is sealed in its lower ¾ of length, and only the top quarter has air holes in the side walls. This means that air that enters the bottom of the tincan is able to rise up the outside of the basket (thereby being warmed) and then that air enters into the upper part of the basket as SECONDARY air to be mixed with the gasification gases that are being generated below in the basket.
>
>4. At the bottom of the basket grate is an airpipe the allows primary air to enter at the bottom of the biomass fuel supply. The air goes upward to the gasification (pyrolysis) zone that is gradually burning downward after being TOP LIGHTED. All of this is ala Reed-Larson and their IDD unit, except that the holes for the secondary air are in this lower unit, not provided by a gap between the gasifier and the burner. In other words, the gases are burned in the upper part of the basket grate.
>
>5. Enter the Rocket Stove. Basically I made an OPEN-BOTTOM small rocket stove to place on top of the lower unit (#1-3). I used a same-size tin can and placed a wire grid at the bottom (top keep the chunky fuel from falling through the bottom) and a side hole for inserting fuel pieces. (My experiment had NO insulation or second layer or shield around the rocket unit, so in my -5 degree C environment, you can imagine how much efficiency I was loosing !!!! )
>
>6. ABOVE the top of the rocket stove I could place an additional ring (for more chimney effect) or place a holder for the pot of water. That holder is want I will call the “cooking spot” or the “cooking level”. I envision that in a real stove, the cooking spot will be independently supported by bricks or metal or whatever, and could look like the top of a stove with “burners” coming from underneath and/or with a hot metal plate and a hot-water tank and whatever else the cook wants. In other words, the heat generation containers would NOT be required to support the weight of the cooking pots. And therefore the heat generation containers can be inserted and removed from the area (a chamber?) that is below the cooking spot.
>
>7. And an extra: I rigged up a bicycle tire pump to be able to force air into the air pipe that provides the primary air to the gasifier. I did not need it, but it let me play with some “forced convection” options.
>
>8. I could give more details on how I made one “basket grate” that fit into a gallon paint can. I rolled some sheet metal, closed off the bottom, punched some holes for the secondary air passages, added an air-pipe, and stuck it into the paint can, sealing for air leaks as best as possible.
>
>9. Fire dynamics observed:
>a. By itself, the lower unit (the gasifier) has the characteristics of the NC (natural convection) IDD unit of Reed-Larson. Not much draft. Languishing flames. Nice but not sufficient to cook a real meal as currently configured by itself.
>
>b. The gasifier was loaded several times, mainly with the wood pellets commercially available in the USA for pellet stoves. I consider those pellets (diameter 0.5 cm and variable lengths of 1 to 2 cm) to be too small. I think they block too much the flow of the air in the NC gasifier. I am seeking some more “chunky” fuel, maybe 1 x 1 cm to 2 x 2 cm sizes). I did sometimes mix in some sticks and some locust tree seed-pods and some birch-bark (wow! for b-b) just for seeing some impact. I am NOT measureing fuel quantities. I just want to get an acceptable fire, then we can measure the heck out of it.
>
> c. Into the Rocket unit, I placed various stuff. Mainly twigs and broken pieces of briquettes, and once a full Legacy briquette with center hole. Everything burned VERY well.
>
>d. Imagine the secondary flames for the gasifier unit licking at the bottom of the fuel in the Rocket stove. I hardly needed to think of lighting the rocket area. The fire quickly went to minimal smoke, with shooting flames that would make any cook-in-a-hurry a happy person. In fact, I was more concerned about cutting back the fire!! I noticed great action in the gasifier unit. The flames above must have been pulling in a draft of primary air. I only played a little with trying to limit the primary air via the air-pipe.
>
>e. After the initial blaze with the rocket unit working great, those rocket flames could be continued via the side-feeder hole, or allowed to extinguish themselves. Then the gasifier continued to put out nice moderate heat that could keep a slow boil going. (Remember that I was outside, below freezing, and snowing slightly, and with no insulation on my stove, so do not ask me for more than these “impressions” of what is “moderate”, etc.)
>
>f. When flames were gone from the gasifier, I tried the air pump. I had a virtual forge in operation with glowing coals that eventually burned through some of my makeshift metal materials! To consume in the stove or remove the charcoal is an open option.
>
>10. Discussion:
>
>It seems to work very well as a combination of our various technologies.
>
>Cheap at twice the price.
>
>Subject to MANY variations and refinements, including issues such as diameter of unit, and nature of the basket-grate, and control of air in the air-pipe.
>
>The stove really does bring together stove components from several people. And that is why I chose the name “Juntos”. I can imagine seeing variations to be called Juntos-2 and Juntos-3 and Juntos-3.C.7. I consider the “Juntos” name to be copyrighted for this style of stoves because the stove has potential to make it into production. If you want a generic name, call them “combination stoves.”
>
>Likewise, I and we all must respect that the “Rocket Stove” is an Aprovecho name and product, so I should be referring to a “lower-side loading stove” or whatever.
>
>I invite everyone to participate with this stove design work.
>
>Crispin, I will probably be making an order for some basket grates to my specifications, so you can start thinking of what the prices could be and what materials you recommend.
>
>I hope to have enough refinements by February to seriously consider production of 10 or 100 for my March trip to southern Africa.
>
>Pictures? Not needed. Crispin and Dean and Richard and Tom+Ron all have their websites to see the component parts. All I had in the back yard looked like 2 or 3 paint cans stacked on top of each other, with flames at the top.
>
>Sincerely,
>
>Paul
>
>
>
>
>
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