Cramer
Junior Member
Posts: 129
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Post by Cramer on Mar 9, 2014 7:22:03 GMT -8
The burner base is poured and cured! Setting up delivery for all of the refractory parts of the build (except for the riser tubes which I already have) on Monday. I don't know the cost yet but I am betting a pretty penny as I am purchasing everything for this build new and not scrounging for the cheap and free stuff we all know is available out there. Next build I will go that way and be able to compare. Got to get this one out of the way first though!
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Mar 4, 2014 16:43:04 GMT -8
Remember.. These are theoretical models, based on completely open chimneys, no benches or really anything.. You can imagine them as open chimneys with electric heaters at the bottom providing heat. Not reflective of real life but useful for visualization purposes. True but individual heaters still could have actual data regarding air volume at the stack aiding in calculations of other values. An actual value in my most humble opinion might be better than an assumed one for the sake of calculating other values within the system. Like I said, just a thought.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Mar 2, 2014 5:33:59 GMT -8
Assuming the system is sealed without any leaks before the final flue (chimney) a flow hood could be situated there at full burn and the actual flow could be obtained there. The flow in M/s or Ft/s could be used to determine volume at that point yielding pretty valuable information I would think. Flow hoods are quite expensive. Most good medium to large sized HVAC service companies have one though and may come out for a fee and be able to take the reading. *Just a thought*
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Mar 2, 2014 5:07:43 GMT -8
I had the prototype burning yesterday. We have had (finally) a few days in a row without precipitation! The wood I was using was still less than ideal but not too bad. The results though were phenomenal! I had a nice fire going with a few pieces of dead fall pine around 2 and 3 inches around. The flames were spiraling nicely in the bottom of the burn tunnel and riser. I went out and collected a bunch of dry sticks that had fallen in our last high wind and stuffed them into the gaps. A minute later I think my neighbor (a half a mile away) could probably have heard the rocket sound. I took a peak down the riser and everything was glowing orange! It was so hot the perlite sounded like popcorn and the flame was dancing a third of the way up the riser! I sure wish they would finish my burner section and deliver my bricks and blankets so I can get on with this!! (Sorry guys, I am a bit of a pyro and I am PUMPED!)
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 26, 2014 18:22:51 GMT -8
Anybody ever used a product called Furnascoat? www.rictec.com.sg/furnascote/I wonder if it might increase the durability of the inside of the riser sleeve?
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 26, 2014 18:16:08 GMT -8
Cramer, your galv pipe should hold just fine. Outside the burner, you might have 600 or 700C° absolute maximum, transfered by the materials, on a very localized point. But it will be cooled by the hot gases. I think, there's no wories to have, at all. If you want something a bit more rust-proof than metal pipe, I'd try AAC(ytong /siporex). Maybe I'm just too impressed with the price, low density and insulation figures, I don't know... I do know I'm seriously thinking of building a batchbox with some kind "proper" refractory core for the hottest bits supported by this stuff. Klemen, has there been any degradation to the AAC you've had in your bench these last months? I know the temps are lower, but if it is going to be attacked by gases then I'm going to have to change my mind about it. The AAC, having lime in it, I fear would break down at extended high temperatures (above around 400 F) it is interesting material though!
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 24, 2014 17:42:43 GMT -8
Thanks a lot for your reply Donkey. Well, doing steel roofing often, i have plenty of flat steel offcuts. I will make a box to hold the rockwool. (like a hat box) Only problem, the time it takes. I'm busy right now. And i have another project on the go! What ever became of this Max?
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 23, 2014 5:25:58 GMT -8
As you pump, negative pressure is created before the pymp equal to the positive pressure after it. Otherwise you wouldn't have suction. Absolutely! If there is to be a pump in the system it should be before the heat, not after it.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 23, 2014 5:05:05 GMT -8
System 2 with a low flow mixing valve on the outlet would be my choice. Safest one I can see and the water inside the coil can not flash to steam because the energy required to do that could not be transferred through the coil. I would use a mixing valve on the outlet to prevent the possibility of scalding temperatures at the shower head if there was a long enough wait between showers to bring the water in the coil to scalding temperatures. Thanks Cramer. By low flow mixing valve you mean the classic valve all of us have on our shower or tap, correct? www.watts.com/pages/learnAbout/temperingValves.asp?catId=This is a link that explains mixing valves and why to use them.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 21, 2014 3:01:41 GMT -8
Fluid Transmission Surface Fluid Overall Heat Transmission Coefficient (Btu/ft2 hr oF) (W/m2 K) Water Mild Steel Water 60 - 70 340 - 400 I found this data, I have no idea how to interpret it but someone else might. Got a link to the source material? www.engineeringtoolbox.com/overall-heat-transfer-coefficients-d_284.htmlIf you mean the shower does not get hot enough then that closed loop idea into a holding tank with a mixing valve at the outlet might be a solution. It is easier to make hot water out of warm water than to make hot water out of cold water right? Just don't blister yourself man!!
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 20, 2014 15:26:33 GMT -8
Keep us informed... looking interesting... and remember ... pictures, pictures, pictures they are worth more than 1000 words I will try to remember to take pictures as I go. Well, the video of the prototype and three views of the mold so far are really all I have at the moment. I am getting a bit tingly in anticipation...
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 20, 2014 10:50:46 GMT -8
Mold It is not the prettiest thing you have ever seen but it will give you the idea. Hit the "next" button at the top of the page to see three different angles.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 20, 2014 10:32:32 GMT -8
I got the riser sleeves today. Can anyone who uses these let me know how to "glue" them to one another? They are 1/2 inch wall, 1 foot long, 6 inch inside diameter sleeves. Flat on both top and bottom. I recall Joris Paul's sleeves on the build Robert observed (the one with the water coils on the exterior behind the "skin") had an angle on them. Concave at one end and convex on the other but nothing on that thread said what material was used to stick them together? Anybody know? Matt? Peter? I know you guys have this kind of riser setup. What did you use? (If you see this post that is) Hey Cramer. I remeber that the tubes where glued by using to kinds of glue... firts was the ceramic fibre kind of glue (which becames same material when will get dry as teh tube it self)... the other one Joris was using was a vermiculite glue. he made a profile with Jigsaw so connecting them was easier... at the end the piece was wrapped with ceramic paper glued with vermiculite glue. pleas make a lot of pictures of your build and share them greetings robert Thanks Robert! I will ask about the material when I go today to get the mold poured.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 20, 2014 5:43:34 GMT -8
Fluid Transmission Surface Fluid Overall Heat Transmission Coefficient (Btu/ft2 hr oF) (W/m2 K)
Water Mild Steel Water 60 - 70 340 - 400
I found this data, I have no idea how to interpret it but someone else might.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Feb 20, 2014 5:20:35 GMT -8
Cramer, just a batch box, with a port, and a long burn tunel behind. Oh, I was not thinking along the lines of a batch box. I understand what you mean now... still, that is thinking outside the (batch) box
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