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Old 06-29-2014, 04:25 PM   #136
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1952 Brick Traditional overhaul


Test two in progress and going great! We definitely have the design done. More video later.

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Old 06-30-2014, 11:29 AM   #137
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Well we are finally swimming out from the massive rain we had this past week and weekend. Reports are that we got from 6 to 10 inches of rain. My redneck rain gauge shows 10". This wheelbarrow was empty on Friday evening and the photo was taken on Sunday morning at 11am when the rain finally stopped.

We have power in the greenhouse! It is off right now while we finish the hookups, but we tested it and it works. We also did extensive testing of the RMH all day on Sunday. I have several videos that are uploading. Basically we discovered that the heat riser (the tall part) needs to be taller in order for the burn chamber to draw. Not to worry, because we were planning on a total height of 40" for the riser. The barrel that will go over the riser will allow the heat to be collected in the thermal mass.

And just for fun, here is a picture of a baby cantaloupe from the garden.
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Old 06-30-2014, 01:18 PM   #138
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1952 Brick Traditional overhaul


We just caught the weather y'all had this weekend, we always get the weather after you do, but most times it isn't as bad when it gets here to Chattanooga.

I do know the higher the chimney the better the draw and sometimes the chimney has to be fairly hot to draw correctly. It still baffles me how the heater will draw up the barrels then back down to a pipe that runs horizontal to the ground, that seems to defy physics but hey, I thought it would smoke back out the fill port too. LOL I wish it were possible to make one of the RMH portable, my little shop is so small already.

We just got our first tomato on the vine this past week, we are watching it like a hawk. Our sage plant has really grown like crazy after setting it out outside. Chicken and dressing with homegrown sage is just fantastic, Judy's dressing is just unreal. Our pepper plant is going nuts, we have so much pepper we are drying it for pepper flakes now.
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Old 07-01-2014, 02:36 AM   #139
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What are your plans for cleaning it out? I like it so far. Shu
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Old 07-01-2014, 12:12 PM   #140
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What are your plans for cleaning it out? I like it so far. Shu
Hey Shu,

The feed chamber front bricks will be removable for the burn chamber clean out and there will be a clean out at the barrel attached to the thermal duct. According to our research, this is where the most ash accumulates. We may also have a clean out at the end prior to the exit duct, but not sure yet.

Here is video one of test two.

http://youtu.be/0tUxgwZiVds
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Old 07-01-2014, 04:06 PM   #141
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And another video of test two.

http://youtu.be/6BVy2k9eAO4
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Old 07-01-2014, 04:44 PM   #142
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More videos

http://youtu.be/7cNGg5bffc4
http://youtu.be/jP5C690KY5w
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Old 07-01-2014, 05:14 PM   #143
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Final videos of test two.

http://youtu.be/ScUluGeYHXU

http://youtu.be/dlvTsGYx5z8
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Old 07-01-2014, 11:49 PM   #144
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Melissa, how big is the cross section of your combustion chamber at the bottom, and the cross section of the riser?
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Old 07-02-2014, 02:11 AM   #145
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Hi Keith,

3 1/2" for the burn chamber and 5 1/2" on the heat riser. The burn chamber has to be the smallest dimension from my reading.
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Old 07-02-2014, 11:16 AM   #146
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Originally Posted by shadytrake View Post
Hi Keith,

3 1/2" for the burn chamber and 5 1/2" on the heat riser. The burn chamber has to be the smallest dimension from my reading.
Yes, that is partly right. I thought your burn chamber was either pretty small or your heat riser too large. If you boost the burn chamber so it is much closer to the riser, I think you will get much more draft. The two should be very close in size. Every time I read the book something else always comes to my attention.

It is my understanding that the cross section areas are what counts here. Your csa on the burn chamber is 12.25 square inches. On the riser it is 30.25...that's a huge difference. Try the chamber at 5" by 5"...I think you will find that it works much better.

You also mention adding more height to the riser. I don't think you will need to do that if you boost the burn chamber size.

One thing I noticed in one of your videos (which I LOVE by the way) is that the board you sat on top of the heat riser didn't catch fire. It only charred. If your burn chamber was close in size to the riser, I think you will find that the heat at the top of the riser will be a LOT hotter. Wood will typically self ignite in a surrounding temperature of just 475 (or so). The riser temp should get up to between 1,200 and 2,000 degrees, so it should have caught that wood on fire easily.
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Old 07-02-2014, 11:59 AM   #147
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Thanks, Keith! I'll have to go back and read more. While the book is good, they could have used a much better editor to assist in arranging pertinent details. I find that a lot of detail is obscured by commentary.

We'll test your suggestion and see if the burn improves. Stay tuned!
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Old 07-02-2014, 06:12 PM   #148
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Originally Posted by shadytrake View Post
Thanks, Keith! I'll have to go back and read more. While the book is good, they could have used a much better editor to assist in arranging pertinent details. I find that a lot of detail is obscured by commentary.

We'll test your suggestion and see if the burn improves. Stay tuned!
Yes, that's very true. As I said, I keep picking up new tidbits every time I read it. I believe there is a reference somewhere to a figure of 5% difference in the size between the burn chamber and the riser. Now, I night have got this off one of the websites and not the book. I think it could be in the RMH section at the permies.com site. I know there's a lot to wade through, and that's why I have been making notes from time to time.

I'm quite sure your riser is high enough, you just need a bit more combustion space. If you increase that, it only makes sense that your riser will move air through MUCH faster. When I tried the little pocket rocket I could hardly believe how fast that air came racing out of the exhaust.

Are you getting that roaring sound when your fire is burning? It really is quite loud, and you'll definitely know when it is working properly. If you are just getting a mild noise, then that isn't it.
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Old 07-03-2014, 12:19 AM   #149
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Here are the videos of test three. We increased the cross sectional area of the burn chamber and there is definitely an increase in the draw. It is not perfect, but better for sure. The heat coming out of the riser was really intense. I could barely hold the camera close enough to see the side burn.

The piece of wood we placed over the cross sectional area of the heat riser smoldered and almost caught fire. It would have if I had fueled the fire for a longer period, but it was getting late and I was tired.

We are going to take measurements tomorrow and experiment with some more burns.

http://youtu.be/r1W1xi92Do8

http://youtu.be/UBo5HmpwlKc

http://youtu.be/IGz-bs5-fHI
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Old 07-03-2014, 10:23 PM   #150
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Okay, here are some photos to chew on while I get the final test videos uploaded. This final test was great! The only thing in question is the feed tube size. I think it might be the cause of some of the fire flare, but I'm not exactly certain. At any rate, we are pretty satisfied with the amount of heat once we added the final pieces of fire brick to bring the riser to 31".

I'm a details gal so here are the specs:

Burn Chamber: 15.25"
Final Heat riser: 31" (we may increase this to 35" when the other bricks arrive)
Feed Tube cross sectional area: Just under 6"
Heat Riser cross sectional area: Just over 6.5"
Burn Chamber cross sectional area: 6"

We got the heat riser so hot that the piece of wood on top burned and at several points, we had flames rising above the top of the heat riser. That was pretty awesome!
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