D Elliott

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since Feb 03, 2013
West Virginia
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Recent posts by D Elliott

Thanks for posting the first 19 scenes on your web site, Calen. My urgent questions about materials are answered. The dvd looks well worth waiting for.
6 years ago

Andrew Ray wrote:wouldn't a sink trap (that is filled before first firing) keep the gases out?

in case my terminology is off, a sink trap is that u-shaped piece under a sink that always stays filled with water to prevent any bad smelling gasses from the drain pipes coming up through the sink.



Your terminology is correct, Andrew. That would be a reason to be careful that water never gets in the flue. We want the flue gasses to pass easily through the mass.
6 years ago
Helpful stuff on Leonard's second question (though not a definitive answer), but how about the first question of a flue 10" lower than the burn chamber? That actually might help the flow if some of that extra height is from a larger manifold to make the turn from the barrel to the flue. Has anyone built a RMH with the burn chamber higher than the flue?
6 years ago
Excellent thread - clearly posed question and the reasoned (and not pontifical) responses I have come to expect from Allen and Erica. This speaks to my condition, as my workshop foundation was started with passages for thermal exhaust before I even heard of rocket mass heaters, and both the stove and the exhaust will necessarily be on the windward side of the building. I am planning to attach a pent roofed woodshed on that side of the shop to house the stove and wood supply, but haven't quite figured out how to capture heat primarily in the workshop's thermal mass, rather than have the barrel emit a lot of heat in the shed. I'm mindful that there needs to be heat transfer in the barrel to pump the exhaust through the mass. More details on all that when building proceeds and I can post pictures and ask detailed questions. For now, I am planning to use a vertical chimney, although on first reading of Ianto's book I was attracted to the idea of a horizontal exhaust. My aim is to have a system that works reliably under a variety of conditions, rather than one that works at maximum efficiency under "perfect" conditions. Nevertheless, I'd like to hear more from Peter as well. Phase change is worth paying attention to, IMO.

Like Vicki, I have parts collected because they might be useful - in my case a lot of flue blocks that went into the foundation to form horizontal channels and a couple of sections of triple-wall stainless flue pipe that I now envision sticking out above the shed roof. I wonder how many RMH designs have been constrained at the outset by the builder's desire to find a good use for materials at hand.

Again, thanks for this fine forum. Allen, I like your "practical zeal". Erica, your elucidation of potential variables is literally a breath of fresh air.
6 years ago
Christine,
I did get in on the kickstarter, and I look forward to receiving my dvd. I expect that it's going to be something I watch a couple of times and share with some friends, but after that I could pass it along to you. I already have Ianto's book, and I've become a regular reader of permies.com and donkeyproboards, so I hope the dvd will give a visual perspective to some of the ideas I've read about and fill in some gaps in my education. Like you, I'd like to get my first rmh prototype working this year, but that's ambitious. I suggest reading like mad first. I'll try to finish with the dvd by the middle of August. Don't wait on it to start work on you rmh. I've been mining clay in my back yard, and I purchased an electronic thermometer with probes for the temperatures I hope to find in various spots along my flue path. Start now!
David
6 years ago
It sounds like you're trying to do 5 or 6 different things, and they may not work in harmony. Do you need to build a working RMH or just submit plans for one? I hope it's the former, because otherwise it will be tough to grade. In either case, I think you'd be wise to ask and answer the question, "Why am I using this?" for every material, every shape, and every dimension in your project. Those are the questions I'm struggling with - not for credit, just warmth.
6 years ago
Thanks, Morgan. I didn't find the specific meters you suggested, but learned some more while looking for them. Received a Nicety DT804A this morning, and I've been using the Jotul in my kitchen to compare the readings from the two low-temp probes supplied and the extra high-temp probe I ordered. Overall, I think this will be a very useful tool. I appreciate your input.
7 years ago
I have a workshop started with a fairly substantial poured concrete foundation into which I placed two parallel flue paths made from concrete flue blocks lying horizontally. The first stage of RMH experimentation will use firebrick construction of combustion chamber and heat riser, covered with cob and a 55 gal. barrel I still have some concrete to pour for the pad covering the flueblock channels. This is the stage at which I might embed k-type thermocouple probes in the masonry mass to check the temperature at various places. I'm looking for a good, reasonably priced temperature measuring device that would accept a wire type K probe. I figure 3 or 4 probes left in place will be plenty, and only the first one will need to handle high temps. I need to find out what kind of heat I would be subjecting the flueblock and concrete to, so I could make decisions about lining the flue, if necessary. Long term, I'd guess that I would replace the firebrick with a cast refactory firebox and primary flue, but that would be after learning how much heat I can store and what kind of improvements I might need to make in the flue through the thermal mass. Right now, my question is: what's a good meter in the $20 to $40 price range. Suggestions of specific type K probes are welcome, too. Thanks.
7 years ago

paul wheaton wrote:

D Elliott,

Last month's rocket mass kickstarter was about a project ernie and erica were involved in a couple of years ago. That is a cob based rocket mass heater.



Thanks for the quick reply. I wanted to be sure the older DVD wasn't one of the four in this new series. No cob in the RMH? (Trying to avoid duplication.) Also, there is a reference to the "Fire Science" workshop in the posts of the previous thread. So, this series supplements the previous DVD? Or is it competing with it?
7 years ago