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Post by coastalrocketeer on Dec 15, 2018 13:36:29 GMT -8
I can’t say I exactly understand your drawing, but i’m Definitely one for using bells over any ducting other than one’s chimney.
It looks like you are planning to run the exhaust in a spiral around your masonry bell? The photos are too grainy and small for me to understand exactly
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Post by rocketman86 on Dec 15, 2018 15:36:06 GMT -8
There are non-isulative castable refractory products that should accept and release heat as well as a standard masonry mass. That's good to know, I will need to investigate further. Have some simulation results for flow.. so far so good I believe, very slight constriction or bottleneck but id hazard a guess to say it was ok. velocity in the flu is greater than burn tube, would you say the amount of difference in these results is ok? Around 6% less.
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Post by rocketman86 on Dec 15, 2018 16:03:12 GMT -8
I can’t say I exactly understand your drawing, but i’m Definitely one for using bells over any ducting other than one’s chimney. It looks like you are planning to run the exhaust in a spiral around your masonry bell? The photos are too grainy and small for me to understand exactly If you click on the image, and again once it opens on the postimage site it gets fairly large
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Post by coastalrocketeer on Dec 15, 2018 16:35:17 GMT -8
I’m not understanding where your exit from the main bell to the channels between it and the outer skin, or exactly where the chimney is feeding from. That site is better, but super buggy on Safari on my phone when I try to zoom in.
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Post by rocketman86 on Dec 15, 2018 17:46:36 GMT -8
I’m not understanding where your exit from the main bell to the channels between it and the outer skin, or exactly where the chimney is feeding from. That site is better, but super buggy on Safari on my phone when I try to zoom in. apologies for that, yes best viewed on pc. Effectively its two rings around the riser opposed to a spiral so gasses can go either way around each ring then up into the next ring then again either way around the ring/riser before exiting up the flu (stone/cob above and between rings) . hopefully this pic will clarify: This is the heater divided down the centre, each halves are identical. Just simulating temperature & radiation using 1000 Celsius radiating object in burn tube, The simulation speed is slower than real time and I effectively have to run it long enough for the concrete in the model to conduct the available heat. could be a while before I have the results.
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Post by coastalrocketeer on Dec 15, 2018 17:58:56 GMT -8
Ok... I understand it now.... I assume for the burn tunnel and riser you will be using an insulative castable.
At those points where gasses rise from level to level, I would make the “floor to floor opening at least 1-1/2 times system csa.
Very interesting design. I am interested to see what the modeling shows for heat flow and transfer.
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Post by rocketman86 on Dec 15, 2018 18:11:18 GMT -8
Ok... I understand it now.... I assume for the burn tunnel and riser you will be using an insulative castable. At those points where gasses rise from level to level, I would make the “floor to floor opening at least 1-1/2 times system csa. Very interesting design. I am interested to see what the modeling shows for heat flow and transfer. I have as you suggested indeed made the opening 29"2 1.5 x 5" flu. Likewise, Pretty interesting stuff.. Here's some screenshots so far (two of temp and one of pressure)..The best conclusion I think ill get from them is to see where the heat extends to once the temperature in the riser reaches 900c. Will take all night to sim to that temp I expect. 60% efficient id be pretty chuffed with considering its compact size.
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