Glenn Herbert wrote:The three-stone fire has been used forever, so longevity is not necessarily an indicator of efficiency. It is an indicator of effectiveness, sometimes in spite of drawbacks like pollution.
I don't see what relevance the comparative O2 and temperature graphs have in the MIT case... more info is needed to tell that. The CO2 concentration is nowhere near as low as the batch boxes that have been tested recently, which is an indicator of less than complete combustion. No visible smoke does not mean no smoke.
2nd to last paragraph-last sentence.
Aaron Festa wrote:"I'm going back to simpler designs that do the same with out the issues.". Can you please elaborate and show us your specific build/design?
William Bronson wrote: Metal stove pipe riser?
And it failed. Go figure.
I could post a bunch of videos showing failures of other stoves or long term success in rocket builds but I don't think that doing so will serve any useful purpose.
The fact that inflated or uneducated or unsupported claims have been made for RMHs does not invalidate the sober research and development that has been done on them, nor do the misled experiments posted on youtube.
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Yes, these will destroy metal, which is why metal is not used in durable builds by people who know what they are doing, but firebrick is very durable, and with matured practices the typical RMH might come to be designed like some masonry heaters, with a lining of firebrick at the highest-wear areas that is There is still research to be done.
Mistaken claims of metal "melting" temperatures aside, metal does distort and/or degrade at the reported temperatures in the presence of oxygen or combustibles. So nobody who knows what they are doing uses it in these areas. The reason there are so many failures is that this is a relatively new (to us, anyway) area with a lot of non-professionals experimenting. Some of them may hit on real improvements. Some already have. There are many, not just some, RMHs that work very well, and deliver heat with radically less wood than established technologies. That is a real-world measure of efficiency.
chase canadé wrote:
Which brings me back to the RMH...And that ugly ass 55 gallon drum. It's just got to go. Someone has to come up with something that looks like it belongs in the living room and not in a gas station work bay. A decorative box around it, something. Anything.
Just because is made out of recycled or waste materials, doesn't mean it has to look like it is.
John Weiland wrote:If you are looking for the ultimate permanence and performance in the unit, build it out of kryptonite, stoke it with di-lithium crystals, and give it the name "Messiah".
I'm going to have to respectful disagree with you
And I questioned myself, "what if everyone had one of these RMH's of rocket stoves?"
The answer is we'd be in serous trouble all over again. The planet especially.
The problem is more basic. Those burning wood as a primary fuel source need to be shown a new better solution.
CO2 is a major problem. We need all the plant life we can get.
And this is not to say the rocket stove or RMH isn't a valid technology worth noting and has use. But it does, in my conclusion, more harm than good.
There are more passive ways
chase canadé wrote:@ Paul,
And someone stated, "this is not permiculture" and... their right.
- chase -
paul wheaton wrote:
In the meantime, for a conventional home, NOTHING beats a rocket mass heater for sustainability and what is better for pollution problems. NOTHING. You wanna do passive solar or a wofati, or AGS or PAHS etc. That requires building a whole new house.
And this is the last we ever heard from this guy. A few years later, we created the "rocket mass heater myths" series: https://permies.com/t/72557/rocket-mass-heater-myths-youtube
David Livingston wrote:Antone
But you can have a straw roof ? in French -Chaume or as we say in English Thatched rooves
I agree about new vs old houses . I find here in France the availability of old solid houses built to last as opposed to new timberframed frankly wooden tents that I give 50 years max very interesting .