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Post by chrisz on Jan 5, 2012 12:49:28 GMT -8
I had an interesting thought. . . I did some preliminary searching and cannot find the temperature rating on glass block. Does anyone know? It's fired isn't it? So it should be pretty high?
What would the possibility be of making a rocket mass/masonry heater with a glass block heat riser so that the flame path can be visible?
Would it soot up too badly, couldn't a top be made to accommodate removal and cleaning? If the glass soots up initially won't it burn clean after a little while and the stove gets up to proper high temps?
just a few thoughts, hopefully someone that knows more can let me know.
cz
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Post by machinemaker on Jan 5, 2012 16:28:19 GMT -8
just two words come to me: Thermal Shock.
kent
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Post by Dan (Upstate NY, USA) on Jan 5, 2012 22:19:25 GMT -8
I put a kerosene heater too close to a cool mirror in a room I am gutting, crack...
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Post by Deleted on Jan 5, 2012 22:58:31 GMT -8
Glass-ceramic could do the job.
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Post by Deleted on Jan 5, 2012 23:58:44 GMT -8
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Post by josephjcole on Jan 6, 2012 6:20:03 GMT -8
soot burns off at ~1200 F
The melting temperature of glass depends a lot on what kind of glass it is, but I tend to think of standard glass (bottles, stained glass windows, ect... ) as starting to get soft around ~1700. definitely too low for a rocket stove.
As karl pointed out though there is ceramic glass, but I have to imagine that would be pretty pricey. It would be pretty cool though...
Joe
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Post by chrisz on Jan 6, 2012 12:47:56 GMT -8
their tech date shows . . .
Maximum Operation Temperatures
Short-term usage:
(total <100 h) Tmax = 760°C/1400°F
Long-term usage:
(total 100 h - 10,000 h) Tmax = 680°C/1256°F
For their product called ROBAX, which if I was thorough enough had the highest rating of all the products they listed.
So that is not high enough?? Where does the highest heat experienced? In the J tube or right where it points/ directs the heat?
cz
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Post by canyon on Jan 6, 2012 14:59:35 GMT -8
I guess you must be talking about doing the "barrel" out of glass block or some such? Insulation around the actual heat riser is critical for it to attain rocket temps and glass block wouldn't stand even close to that heat. I've been playing with reused pyrex kitchen stuff for feed door windows on horizontal feed units and by allowing cooler combustion air to wash over the window I am hoping for some longevity but it is still experimental. Please let us know what works and what doesn't if you experiment.  |
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Post by josephjcole on Jan 6, 2012 17:37:18 GMT -8
(total <100 h) Tmax = 760°C/1400°F Long-term usage: (total 100 h - 10,000 h) Tmax = 680°C/1256°F So that is not high enough?? Where does the highest heat experienced? In the J tube or right where it points/ directs the heat? cz I have a stove that I threw together this fall, with an unisulated heat riser. Obviously less than ideal, but I still measured 1400F above the heat riser. I'm sure it would be much hotter if the riser was insulated. I didn't go around putting holes in anywhere else in the stove so I don't have an answer to where it's hottest only how hot mine gets in one spot. Joe Joe |
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Post by bakermonitor1932 on Jul 27, 2013 17:54:24 GMT -8
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Post by oboblomov on Jul 28, 2013 6:33:07 GMT -8
Cute. But the demo doesn't really show it working, in my view. Or, put in other words, it works about like I do :-) What happens if there is self sustaining combustion in this little glass stove?
obob
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