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Post by dustylfc on Oct 1, 2015 1:52:30 GMT -8
Great stuff Coming along nicely
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Post by exoplasmic on Oct 3, 2015 11:42:12 GMT -8
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Post by dustylfc on Oct 3, 2015 13:37:21 GMT -8
will you be leaving the woodburner as is? meaning no brick around the casing? or do you plan to cover it to match the rest of the build and leave the door flush?
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Post by exoplasmic on Oct 3, 2015 17:33:11 GMT -8
I was planning on leaving the metal uncovered on the sides, but laying brick on top to help heat the tube for secondary air. But now that you mention it, enclosing the sides would look better. I wanted to get a little radiated heat from the metal. That way some heat could be generated a little bit quicker than waiting for the brick to heat up. The inside of the metal wood stove is lined with firebrick. I cut the entire back off of the metal box because it wasn't long enough.
The bells will be made using a single layer of clay brick. I know it will not meet fire code but I think this is ok. There is the possibility that having a single layer of clay brick might get it very hot. Also, with a single layer of clay brick with no insulation, it may cool the exhaust gases down more than what is required for a good air draw up the chimney. However, if this is the case, then I'll put another layer of brick around the bells. This whole project is an experiment after all is said and done.
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Post by dustylfc on Oct 4, 2015 0:30:33 GMT -8
I am following your build with great interest as am planning a similar build for my future man cave :-)
It will be good information for me to digest on your findings with it being single wall bells as to whether it does cool down to fast
I had sort of a distant thought to use a barrel as first bell but have that within another brick bell not sure if that would work well
With my build to be mostly outdoor I was hoping the thinking is to heat up the barrel faster then to heat up the bricks surrounding the barrel then into a smaller brick bell
So theoretically my 1st bell would be double skinned. barrel then brick Then second would be brick Without experimenting with it I have no idea how it would perform
Your build gladly will answer some questions that I will no doubt myself stumble into
Thanks again for the pics and info
Dusty
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Post by mkrepel on Oct 4, 2015 7:53:36 GMT -8
I thought about using a barrel for the second bell. That way most of the heat is absorbed in the first bell and the room is heated more quickly by the second bell where the gasses are much cooler than in the first bell. This arrangement is still likely to cool the gases too much for reasonable flue gas temps. I think it could be adjusted using some fire brick inside the barrel to reduce the instantaneous heat transfer to the room. I was thinking about stacking the bricks inside like Dragonheaters does in their derrick build. I could start with nothing in there and see what happens and then start adding bricks. Start with a couple of rows and then keep increasing the stack until I get it balanced. This would be almost infinitely adjustable which means I could avoid (reduce the chance, at least) overheating the room while the fire is going
The fire bricks inside would also boost the heat storage a little bit.
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Post by dustylfc on Oct 4, 2015 13:11:00 GMT -8
if you added bricks to the inside of a barrel you will be reducing its size as a bell ? I've never experimented with either so it's just a thought
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Post by mkrepel on Oct 4, 2015 15:24:23 GMT -8
Yes, it might have to be a little taller to account for the reduced diamter. I think of it as a wide spot in the flue where I can use the more moderate temps to dump more heat to the room without overheating. The real heat storage bell would be the first one. The higher internal temps would occur there as well. The trick would be to dump just enough heat so the room heats nicely, but the chimney still works as designed. I would get a small shot of early heat to the room.
I don't know if it would work very well, but the concept makes sense to me. So far it is just a crazy idea, but I want to give it a shot to see how it works. This would start as a workshop heater. I am thinking of using a Walker Riserless core built into fairly large brick (or stone) bell and have that dump to the metal bell before sending the gasses up the chimney. My current thoughts are to delete the cooktop as I really don't need the ability to heat food/water in this application. That can always be changed later as needed.
It is still a concept right now, but I plan to get the necessary materials in the next couple of weeks and start experimenting.
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Post by exoplasmic on Oct 4, 2015 16:41:17 GMT -8
Getting the room warmer at a quicker rate is a good goal. The traditional rocket mass heater does a great job at that.
Keep in mind the ambient air temperature around the bell. If your experiment is outside, then wind needs to be accounted for too.
Good luck.
Mike
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Post by exoplasmic on Oct 4, 2015 16:56:51 GMT -8
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Post by dustylfc on Oct 4, 2015 22:44:52 GMT -8
Starting to take shape now Really hope it takes off first burn and warms very nicely
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Post by exoplasmic on Oct 10, 2015 11:10:28 GMT -8
Me too. I plan on having a lot of little fires for the first week so the casted refractory parts release the molecular water slowly and don't crack or explode.
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Post by exoplasmic on Oct 10, 2015 11:23:57 GMT -8
Here's a pic of the heat riser with ceramic blanket around part or it. I ran out of the blanket so I can't surround the entire heat riser. www.dropbox.com/s/bxxruuzg0gbldiy/2015-10-10%2014.51.37.jpg?dl=0Here's the secondary air tube. I plan to cut it half way and brick over it and the back half of the stove top. That will be floating on top of the metal. Then I'll brick up the verticle front of the heat riser chamber. That will also float or be sitting on top of the metal. Ceramic rope will fill in gap between refractory brick and red clay brick. www.dropbox.com/s/4eh88p41kyqn5gc/2015-10-10%2015.01.37.jpg?dl=0Last pic for now, shows the footprint of the second bell with the door between 1st and second bell. www.dropbox.com/s/9b3h5xgthaih57l/2015-10-10%2014.47.02.jpg?dl=0The 2nd bell clean out door is right below the chimney. That way I can start a fire there if I need it to get a good draft pulling air from the firebox. I have no idea how this system is going to behave during a cold start.
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Post by dustylfc on Oct 10, 2015 13:13:28 GMT -8
Let's hope it drafts and fires up from the get go If possible when finished could you tell me the amount of materials and bricks used ?? If not no worries I will follow your build regardless
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Post by daniel on Oct 10, 2015 23:38:52 GMT -8
Exoplasmic, nice job, is the entry and exit into the bells at same levels in your picture? What is your system size? I am building a 8" batch box and encased the riser into a stainless steel sleeve and cast around it a 4" layer of expanded clay with perlite clay and refractory mortar. The inside refractory sleeves have a 1/4" cardboard around it which will burn and allow for a replacement if ever needed.
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