I opened my yap on this subject a couple weeks ago on you tube and got a reply I couldn't answer properly right away, so I sat down with my think book and created a video on metal & rocket stoves. I am now wondering if any of you see any fact boo boos in the video, cause I like to be correct when I go and flap my lip.
Yone' Ward wrote:I opened my yap on this subject a couple weeks ago on you tube and got a reply I couldn't answer properly right away, so I sat down with my think book and created a video on metal & rocket stoves. I am now wondering if any of you see any fact boo boos in the video, cause I like to be correct when I go and flap my lip.
Wow, you put a lot of time into this. I am curious why no one has replied yet. I bought one of those little "rocket stoves" in a bucket. Waste of moola in my opinion. Good hype/promotion/advertising though.
I don't think anyone would disagree with the information in your video. The difficulty is we only have the materials we have, and we want to achieve the highest temperatures possible. I suspect the RMH burn tube temperature (and other types) is much higher than the measured outlet temperature.
If you put a load of wood on and burn relatively slowly (low heat), you don't get a large output temperature. If you put a small amount of wood on and burn fast and hot (high temp but still low heat), you still don't get a high output temperature even though the combustion took place at a high temperature. The other point is the chemical reactions don't all occur at once like flicking a switch, even for one reaction say like CO to CO2. Some happen quickly and some take longer, so you need to have a long enough flame path. CO measurements for RMHs are pretty low, and as a comparison, from pressure jet oil burners are very low (maybe only 20ppm) and this is inside a boiler whose output temperature from the combustion chamber and first heat exchanger is is less than 200ºC. For these burners, all the combustion has occurred well within a foot of the nozzle.
Ceramic boards which are good insulators, like are used in kilns, would allow very high temperatures, but in the end even those would need replacing. This is what maintenance is all about.
Location: Springdale, WA USA - Cold Mediterranean Climate
I fully understand the situation of building stuff with what you can, it's just good to keep in mind what you are actually accomplishing, not what hype says you are accomplishing. I fully intend on build ing a few of these rocket stoves. I pretty much have three home here that want rocket mass heaters and I will probably have to build a couple others here on site to fill our other needs. There will be experimentation an temperature checks. Aluminum melts around 1220F, so if I can melt aluminum cans in most of my stove, I would call the stove a success for reaching minimum temps.