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Post by satamax on Nov 25, 2014 11:00:28 GMT -8
Hi everybody! Well, daft question, i will have to knock that partition wall in my future workshop.  Thoses are like the one seen on the foreground.  Do you think thoses could be of any use for a bell? How much heat does red clay whistand? Thanks in advance. |
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Post by pinhead on Nov 25, 2014 12:51:49 GMT -8
I'd use them!
I'd build a large manifold below the barrel and feed the exhaust directly into a few rows/stacks of them encased in cob to keep it from leaking, and then into a "bell" manifold at the end, feeding the chimney.
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Post by Daryl on Nov 25, 2014 13:23:44 GMT -8
If those are standard red bricks....a ton. They will sop up the heat so don't use them for the core.
I love them. Nice steady radiation of heat.
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Post by Daryl on Nov 25, 2014 13:26:05 GMT -8
Dude, you hit the jackpot. I am way jealous.
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Post by satamax on Nov 25, 2014 13:41:52 GMT -8
Dude, you hit the jackpot. I am way jealous. 
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Post by patamos on Nov 25, 2014 17:07:38 GMT -8
One of the indicators for higher heat duty is the kind of sound it makes when you give it a tap with a hammer or flick with your finger. The higher the pitch 'ring' the higher alumina content and, in general, higher heat capacity. Learned this from a old guy who has been in the chimney brick business for decades.  |
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Post by satamax on Nov 26, 2014 22:18:04 GMT -8
Well, i've tried to stuff a broken pieve of that red brick, about 20cm long in the rocket range. And it whistands heat so far.
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Post by Daryl on Nov 28, 2014 15:15:45 GMT -8
Cheers!!!
I'm telling you...it is addictive stuff. Soon, you will be building little brick stoves all over the place and neighbors will be giving you weird looks.
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Post by satamax on Dec 4, 2014 21:32:09 GMT -8
Cheers!!! I'm telling you...it is addictive stuff. Soon, you will be building little brick stoves all over the place and neighbors will be giving you weird looks. As if it wasn't the case already!  |
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Post by patamos on Jan 27, 2015 23:48:24 GMT -8
Hey Sata,
i couldn't find the thread you posted about filling those bricks with sand, so i hopped in here.
I was back the other day at a studio i build some years ago. In it we did interior walls of 2x6 with 3/4" plywood either side and hydronic tubing running through the studs and the stud bays/cavities filled with sand. It has been doing a great job of heating the place.
Reading up on Bob Ramlow's Solar SandBed heating system, is see info stating that a cubic foot of sand holds roughly the same amount of heat (specific heat capacity?) as 3.6 US gallons of water. The sand is of course less than 10% as efficient as water in absorption, conduction, emissivity. And with a density of around 110lbs cu.ft it is about 75% the density of most earthen/brick materials. Therefore likely 25% less efficient in transferring heat through its mass. Fine sand is a little heavier per cu.ft. But as Donkey suggests - silica sand is no good.
This much to say. The sand will work so long as you factor in a 25% drop in conductive efficiency...
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Post by DCish on Jan 28, 2015 9:07:14 GMT -8
Pardon my ignorance, but how would I recognize silica sand if I saw it? Is "play sand" silica sand? Thank you.
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Post by patamos on Jan 28, 2015 9:21:55 GMT -8
Silica sand is usually quartz crystals. white or translucent in colour. Crushed glass is also sold as silica sand in various grits and can have some colouring to it. I am not sure of the ratios of pure silica in various bagged products.
Silica/quartz is found in a lot of rock formations, so it finds its way into ground sand. The lighter colour the sand, the more likely it has silica in it. Play sand would have a fair ratio, but i am not sure how much of it is enough to cause trouble.
I built a rocket cooker with white marble pot rests, just cuz i had them kicking around (conveniently sized samples from a marble supply shop). They disintegrated after two hours of high temperature burning. So Donkey's caution about using silica is worth heeding.
I think fine blue/grey mason's sand out of the ground is a good bet.
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Post by DCish on Jan 28, 2015 13:29:23 GMT -8
Thanks Patamos! I initially bought "all-purpose sand" that had making mortar as a listed use. Turned out to have lits of very coarse stuff mixed in, including lots of silica. Went with play sand instead, very much like beach sand, only a few silica crystals here and there. So far so good on the bell I made with irregular shaped building bricks. Seems grog might be a good bet as aggregate for higher temp situations if more thickness is needed.
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Post by satamax on Mar 11, 2015 7:48:29 GMT -8
Hi everybody! So, the wall is down, and i have gathered may be 50 of thoses bricks.  Any idea what to use thèses for in a rocket? Thanksalot! Max. |
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Post by Daryl on Mar 11, 2015 8:22:55 GMT -8
This couch is comfy. |
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