hpmer
Full Member
Posts: 240
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Post by hpmer on Mar 11, 2012 5:21:32 GMT -8
This design also brings up a couple of other concerns.
First, this thing is going to be dangerously top heavy with the heaviest part often being super heated. You'll need VERY good bracing to counteract this. I've built several versions of a portable stove and am continually surprised at how heavy even the insulated lower part is (burn tunnel and heat riser).
Second, the air between the pebbles will act as an insulator, so for maximum efficiency they should probably be mixed with cob or dirt or something. This, of course, will add to the weight problem cited above.
Finally, I would want to avoid any requirement on the user to do any sort of maintenance other than perhaps ash cleanup. The whole dismantle, wash the pebbles and send some samples seems good in theory, but unlikely to happen in most cases, particularly for your target audience. We may enjoy monkeying around with these things, but I'd be surprised if that were typical.
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Post by leewaytoo on Mar 11, 2012 6:58:39 GMT -8
from the side/front... this way you draw your cool air from the floor vs from the top of the heat riser/barrel.
also same height as burn barrel and no cleaning.
dont know if this is old news or not, just a thought.
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Post by pluton5 on Mar 11, 2012 12:41:06 GMT -8
=freelab
mo¿esz wyt³umaczyæ po co chcesz przepuszczaæ spaliny przez te kamyki?? co to ma byæ? -masa termiczna -filtr bo trudno mi zrozumiec twoj¹ koncepcjê. Napisz co chcesz osi¹gn¹c . Bo to niedobry pomys³ jak pisa³ peter,, po pierwsze to musia³yby to byæ duze kamienie ,¿eby nie powodowaæ zatoru,a po drugie to po kilku paleniach ca³y ten kocio³ ulegnie zatkaniu, opsz cel tego eksperymentu
================ = freelab
Can you explain why you want to pass the gas through these stones? What is this? -mass thermal -filter because it is hard for me to understand your concept. Write what you want to achieve. Because it's a bad idea as he wrote, peter,, first, it would be a big stones, so as not to cause congestion, and secondly, after a few burnings whole boiler becomes clogged, Describe the purpose of this experiment
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Post by peterberg on Mar 11, 2012 14:03:40 GMT -8
At this time, however, we shall only need the heating for couple months, probably no more than 8-10 weeks. Hmmm... 10 weeks, with two firings a day would be 140 firings per season. I'd estimate the clogging will occur between 30 and 60 firings, greatly depending on the moisture still in the fuel. When the stove should be very simple and there's already a rocket stove, why won't you place another barrel behind or beside the first and use that as a bell? Fed and exhausted both at floor level you'll be surprised how much heat will be extracted. And to create a mass heater in this way, the only thing you'll have to do is place a smaller barrel inside the larger one and fill the space between these with clay and brick fragments. Of course, the smaller barrel is the bell in this example and the larger one is only the canister to hold the mass. Not enough mass? Use a third bell, that'll be a lot better. Please, try this first, it's a very unusual but nevertheless effective way of extracting heat. And I'm sure it will work, tried it myself.
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