Dominic Lemoine

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since Jun 13, 2013
Wales, UK
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Recent posts by Dominic Lemoine

Hey guys thanks a lot for the replies.

@Satamax. Really interesting idea to convert the whole hearth into a bell. Thing is, there is a massive oak beam holding the hearth together and I don't want to mess with it. Maybe a smaller bell?

@Thomas. My burn tunnel is the exact size that was described in the plans (well... give or take 10mm). So is the CSA. I have absolutely no backdraft problem. I can put a incense stick a foot away from the feed tube and see all the smoke going in! I have measured the barrel temp near the top on the side the barrel. I have measure roughly 100F higher on the top. Yep, my cob is dry. I made this system at least two good months ago.

@Big Al. No worries, the magnetite bricks have only been used in the mass. What you see is proper refractory bricks. I see what you're saying about insulating the burn tunnel. I have to say that the front half of the tunnel is insulated (not shown on the photos) with a clay-perlite mix. Maybe I could fill the space between the outside of the burn tunnel and below the barrel with clay-perlite leaving only the space for the air to get out? That would almost certainly allow the core to reach higher temps.

Yes, I have used slightly bigger bricks because the ones used in the plans were not available in the UK. And I thought I would be doing a better job using refractory bricks rather than too much cob! Silly me... It does takes a while to heat up but its not a question of hours. Merely minutes.

I think it would be good for me to add more clay-perlite insulation and see how it goes. I am not too keen on destroying the whole thing if a simpler solution is available.

Tell me what you think guys.

Dominic
6 years ago
Hi everyone,

I need your help with this one. I have built my first RMH using Ernie and Erica's 6" plans.

My heater works fine when it comes to lighting it, its draft if pretty amazing. The problem is that I don't get efficiencies nowhere near what many of you have reported. I burn more or less the same amount of wood to heat the room than I did before with the normal store-bought stove.

Symptoms are:
-I see smoke coming out of the chimney even after the system has been running for several hours.
-Outside barrel temperature rarely exceeds 350-400F when I use extremely thin pieces of wood and constantly play with it. Normal temperatures are more around 300F.
-The RMH fails to heat even a relatively small lounge (13' x 15') in a mild Welsh winter (Outside temperatures around 40-50F (5-10C).

I have included a link to video of the first lighting as well as photos showing the building progress.

I have used new refractory bricks, refractory cement, insulated everything with a clay-perline mix. Also used new stainless pipes for the exhaust. The heat riser is a piece of T304 stainless steel surrounded with a clay-perlite mix.


Video of the first lighting.


https://vimeo.com/76323708


Online album of the RMH in progress

http://imgur.com/a/pwHnW#0



Looking forward to hearing your thoughts on this. I wish to be able to fix what's wrong with my RMH and start using it again.


Dominic



6 years ago
Hi Allen,

Thanks for your comment. I'll use the lot!

So how big is your travelling yurt? We've got 20 footers here. Plenty of space!

Regards,

Dominic
7 years ago
Hi everyone,

I'm in the process of building a smallish 6" system with about 10' of buried flue for the mass. I have a quick question for you guys. I have a lot of magnetite bricks in the barn. They came out of our big electric storage heater we dismantled two years ago. From what I understand magnetite is pretty good at storing a lot of heat. The thing I'm unsure about is how fast will it release it. I understand that monolithic cob would release its accumulated heat at about 1 inch per hour. Does anyone know how fast magnetite loses its heat?

Depending on the answer I would use more or less of the magnetite.

Thanks a lot!

Dominic
7 years ago
Allen Lumley: Thanks for the info! Yes, I am gathering information and bookmarking relevant forum posts. Lots of good stuff out there!

I will definitely follow your advice when I get to the build phase and take plenty of photos for posterity - and troubleshooting.

I do feel more confident knowing that a 7" RMH would be a middle of the road system. I don't quite feel like I am ready to start crazy amazing experiments.

I wasn't able to find what the burn tunnel's cross sectional area (CSA) would be for a 7" RMH. Any advice on how to get the numbers worked out? I'm seeing 30 sq. inches for a 6" system and 49 sq. inches for a 8" system. The ratios between the exhaust flue and the burn tunnel CSA is 5 for a 6" RMH and 6.125 for a 8" for a RMH. From this I am guesstimating a 7" system could have a ratio of 5.5625 ((5+6.125)/2). That would give me a CSA of 39 sq. inches. How does that sound?

Cheers
7 years ago
Hi Allen and thanks very much for such a warm welcome!

I'll try to answer your questions. My house isn't historically graded (i.e. I don't have to ask permission to change it). At the moment, the house is covered with a slate roof.

I did my homework and consulted a chimney sweep a few months ago. The current flue has been redone some 30 years ago according to building regs. The flue is 7" all the way through and seems to be lined with pumice. There is no big gaping hole for open fires like we sometimes see in well preserved historical houses.

No, I don't mind the barrel being part of the house!

Has anyone heard of working 7" systems? I like the idea of the larger burn chamber which allows for larger logs. If not, I will probably go for a more common 6" system. Maybe buy the plans from Ernie and Erica Wisner. Would there be problems with a 7" exit flue? I can't see why, but I am new to the dynamics of RMHs.
7 years ago
Hi everyone,

This is my first post here. I wonder if you can help me with this.

I am planning to build a RMH in my lounge. I have been reading Ianto's book and am interested in building the 8" RMH. There is however an existing 7" exhaust flue situated at the top of an inglenook (where I have a standard stove at the moment and where I would build the RMH). I live in a 400 years house and I don't feel like opening the 3' walls to replace the 7" pipe for an 8".

My question is: what changes would I need to make in order to make Ianto's 8" RMH design work with a 7" exhaust flue?

Thanks a lot!
7 years ago