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Post by ribeira on Jan 6, 2019 9:21:19 GMT -8
Hi guys I plan to build an 8" batchbox to warm my house and my hot water, I'm creating this thread to collect informations, I already read a lot of thing about it but remains some questions
here we go!!:
What slope must I put for the tubes in the bench? (who many centimeters per meter?)
I plan to build a square heat riser following the informations at the bottom of this page, I will build it with white insulating refractory bricks, around the heat riser I'll put vermiculite, is that design is OK? the bricks are crossed enough?
Thank you all!
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Post by peterberg on Jan 6, 2019 10:28:59 GMT -8
Hi Ribeira, welcome to the donkey32 boards. It's a tough call to warm both your house and water with the same heater. But that's a discussion for later, let's start with your questions.
It would be best (in my opinion) to leave out the pipes in the bench and build a bell bench instead. Like the heater you are referring to, there isn't a single centimeter of stove pipe in there. A bell construction poses a very little bit of friction to the smoke path, unlike the piped bench construction. A batchrocket is very picky about friction, that's why.
The white insulating firebricks are perfectly adequate for insulation, so for this aspect you don't need vermiculite around. But your bricks are a bit short, I'd recommend to support the riser from the outside in order to keep the bricks in place. This could be done with a wide pipe around the riser and the space filled with a perlite/clay mix. Perlite is easier handled because it doesn't take up as much water as vermiculite.
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Post by ribeira on Jan 6, 2019 14:54:54 GMT -8
Hy Peter, I'm very glad to have advices directly from the Master ^^
For the bench I talked about pipe but it will be made of bricks, two meters long, with a go and back, the exhaust chimney behind the barrel (I will put basic 3D view tomorrow it will be clearer), how can i make a bell bench in this configuration?
So for the riser I can do what you said, or maybe I will call the factory to know if they got longer bricks, if this is the case I won't need to put something more around the riser, am I right?
thx a lot
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Post by travis on Jan 6, 2019 20:29:09 GMT -8
Hello. Have you calculated the internal surface area (ISA) of your system? In my opinion using stove pipe to channel the system as well as heat water (for radiators?) Would be difficult. I have successfully built a bell around an old system utilizing the radiators as well as an old heating wall. It heats wonderfully living in northern Mongolia.
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Post by ribeira on Jan 6, 2019 23:40:53 GMT -8
Hi travis, thank you for your interest
No I didn't calculate it, I know what you are talking about, I read about it a long time ago but I don't know anymore how to calculate it, as I said to peter I won't really use pipe but bricks but for the bench channel, it was a way to ask about the slope in the bench. ( I didn't used the words channel cause it didn't came to me)
So for the hot water I just plan to warm a 150 liters tank (maybe 200 l) and use only one radiator to don't waste energy once the tank is warm (with 3 way valves and temperature sensor).
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Post by peterberg on Jan 7, 2019 3:08:05 GMT -8
.....as I said to peter I won't really use pipe but bricks but for the bench channel, it was a way to ask about the slope in the bench. ( I didn't used the words channel cause it didn't came to me) A bench built out of bricks won't need a slope, the small number of benches I've been building myself didn't have slopes. A channel is something else entirely, a bell bench is just an open space inside with a low exhaust opening so the heat will be trapped in the top part. The exhaust gases would route themselves driven by gravity.
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Post by satamax on Jan 7, 2019 3:12:12 GMT -8
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Post by travis on Jan 7, 2019 3:26:57 GMT -8
Great, its good to find other people with a similar passion! How are you wanting to heat the tank? My system uses a small tank, its mostly what circulates through the system. Maybe a total of 70 liters. It is heated by an old steel russian radiator placed inside the bell. As long as you dont mind the slower warn up time with more water it sounds good. I would say it is very helpful to have a bypass in a system. Like this. If the mass is cold and the water is cold it will be very hard to start.
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Post by ribeira on Jan 7, 2019 6:49:09 GMT -8
Thank you all again for the infos. here a quick plan on sketchup of what could be me my RMH www.dropbox.com/s/h6owdxixafefltf/RMH%20ribeira.skp?dl=0
I tried to create and name layers to more understandability
few more questions come now:
-Is my bench is well designed?
-how thick must be the top of the bench to don't burn my bum or the wool mattress I plan to put on it
-how to calculate the ISA, cause if there is more ISA left I can make a little bell on the first floor too
-What about the hot water?
I also can do bigger batchbox if it's necessary up to 220mm diameter
cheers
Satamax: je suis en creuse, t'es dans la vallée de la roya?
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Post by satamax on Jan 7, 2019 21:03:08 GMT -8
Ribeira, je suis a serre chevalier.
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Post by ribeira on Jan 7, 2019 21:53:53 GMT -8
satamax ha oui ok, j'ai cru lire dans ta signature french riviera/italian border... j'ai halluciner...
travis : sorry I missed your answer...I want to heat the water with a copper coil around the barrel of the main bell and clay around the barrel.
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Post by satamax on Jan 7, 2019 23:14:17 GMT -8
Hi Ribeira. Well, since you are in France. You might be interested in my building system. permies.com/t/44806/Cobbling-workshop-heaterThere is a lot of pictures, son you might have to reload the pages few times to see all of these.
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Post by ribeira on Jan 7, 2019 23:56:09 GMT -8
Yes I already saw it few days ago! nice job!
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Post by ribeira on Jan 9, 2019 2:00:34 GMT -8
Hi, does somebody have time to check my sketchup plan please?
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Post by ribeira on Jan 9, 2019 23:48:06 GMT -8
I find out how to calculate ISA, so for a 20cm batchbox the ISA max is 10,6m² (if I'm right and if the informations I found here are still good, For a 8"system, 50.24x2.285=114.8sq'masonry) and I'm around 6m² of ISA with my actual plan
So I still have some energy supply to heat my water, what do you think about that? am I right?
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