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Post by thepoopsmith on Jan 23, 2010 20:11:41 GMT -8
Situation:
I got a need for a stove to boil ~60L (15.5) gallons of fluid quickly and keep it boiling for some time... If you haven't guessed it, I'm making beer! Yes, I want to make batches from 10-15 gallons, but I don't want to deplete my propane supply.
Does anyone have any knowledge of how fast an institutional rocket stove can bring water to a boil? The stove is found on the aprovecho website and many videos can be found online. From the videos I'm thinking it's around 20-30 minutes--but that is some incredible heat transfer!!! Please let me know if I'm even close, as I am probably going to start this construction soon.
If don't get any answers, then once built, I'll test run it (after tweaking of course) and see how fast I can boil some water. Might be good for emergency situations here in the states--or for a shrimp boil!!
TPS
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Post by canyon on Jan 23, 2010 21:16:51 GMT -8
I built a rocket fired brew kettle with a 1/2 bbl keg on top of a 2' heat riser with another 1/2 bbl keg for the radiating barrel all on top of a wood stove lined with firebrick. I think there might still be a picture of it under something like "water heater by canyon". Anyway, it only has the surface area for heat exchange being the bottom of the kettle and it works but not in 20-30 minutes. I actually use it for heating my mash and sparge water and use propane on my kettle because I brew 2 bbls at a time and haven't converted my 2bbl kettle to wood yet. If I could only stop working and brewing I'd finnish my tube/shell heat exchanger and really have some hot water. Maybe this spring... Are you planning this for brewing indoors or out? All grain or extract? Where are you located?  |
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Post by thepoopsmith on Jan 23, 2010 21:24:07 GMT -8
Very nice! I'll have to find pics of your setup! Unfortunately I'm in Florida...opposite side of the US. I do extract right now, planning on getting into all-grain pretty soon.
I planned on brewing outdoors mostly. I have been looking at folks' home brewery setups and kind of want to copy them but with rocket stove designs rather than propane. I guess in the future, providing i build a shop out back i could run a chimney and brew inside! that'd be great!
Anyone want to join in on our hobby discussion!??
Anyone else got ideas on the boil time for an institutional rocket stove?!
Thanks again canyon for your input...more inspiration--it's what i need!
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Post by thepoopsmith on Jan 24, 2010 6:35:38 GMT -8
true..i'll try start another hobby thread elsewhere or someone else can if they want!
Back to topic....any boil times anyone?
Thanks!
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Post by canyon on Jan 24, 2010 14:32:55 GMT -8
If you are brewing outside it is way easier! If you're water table isn't too high you can even dig into the ground to build your rocket and save some height! I think it is best to build two burners for brewing, one for hot water and one just to boil wort. The hot water maker can be way more efficient like the kelly kettle design or the salvaged gas hot water heater laid on its side or  , point being that you need way more surface area for heat exchange to heat up your h2o fast. Wort is too sticky messy and you need just a straight forward kettle to be able to clean and, you need fine control of the fire to avoid B.O. (boil overs). |
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Post by Donkey on Jan 25, 2010 11:05:38 GMT -8
I can't answer the boil time question either.. Just to say that the more surface area you expose to the heat the better that will be.. (duh)
I'm really just popping in to put in a plug for the Aprovecho design on this one. They've put a WHOLE lotta thought and research into maximizing efficiency in their "institutional stove". I'll even have to agree with their horizontal feed here too (which I almost never do) on account of the fine control you need.
Just a word of warning on that, there's a trade-off, It's gonna require constant babysitting.
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Post by thepoopsmith on Jan 31, 2010 6:06:21 GMT -8
since i don't have any answers on the institutional sized stoves...
Can folks post the largest amount of water they have boiled and how long it took?
(Moderator, if need be, i can make the new request in another thread??)
TPS
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Post by canyon on Jan 31, 2010 14:06:32 GMT -8
With 14 gallons at 40 degrees F, from the time I strike a match to boil.. approximately 2 hours. There is only 154 in ^2 of surface area for heat exchange to the liquid (water in this case) and the rest of the hot gases goes to through my bench after which they've given up most of the usable heat (stack temp well under 200 f mid flow). This is for dry spruce and with 1/2 dry alder I can get it to about an hour and change but I am glowing metal components and I am not comfortable with the 120+ wet hot lbs of water being supported by glowing hot stainless so I stick with the two hours/mostly spruce for now. |
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Post by Donkey on Jan 31, 2010 14:41:42 GMT -8
Boil time will depend on a lot of factors.
Rest assured that if you want to boil water with wood, the Aprovecho "institutional stove" is gonna be the MOST efficient, shortest time option.
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Post by thepoopsmith on Feb 3, 2010 19:39:13 GMT -8
thanks everyone for the advice and numbers. Probably gonna make one of these one day. Gotta have something to heat my wort, and also would be good for cooking/disinfecting after a hurricane without electricity. Gotta be prepared!
TPS
Also, going to try to build one of these (or something like it) and modify it to run on either wood OR WVO (waste vegetable oil). I'm planning on the WVO will be able to heat things up faster and then later build a burner to heat a boiler for the house!--this hobby/ideas are addicting!
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Post by thepoopsmith on Feb 6, 2010 12:14:10 GMT -8
Found this website. If the author of the webpage below is on this forum, please let us know!! www.chilakootbowhunters.org/rocketstove7.htmhe got 5 gallons boiling in around 15 minutes!!! Not too shabby...figured this would be good for brewing beer, cooking crawfish, cooking up bath water during power outages, etc, etc. any other takers on doing better than this?? Pics are also welcome of your super water heating design!!! TPS |
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Teach
Junior Member
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Post by Teach on Feb 20, 2010 16:18:05 GMT -8
TPS, I think the idea of a rocket fired institutional stove would be great for your kettle to get water up to boil quickly but not for your mash tun. I've been brewing all grain for a lotta years and even with fine control valves on my propane stove that I use for the mash tun and the wart boil.......canyon said it..........from time to time I still get the odd boil over........ratnfratnsazafratn!!!!! With hops added and a thick syropy wart.........you can have one hell of a mess in even less time then it takes to say shite! And that is with a very constant heat source. Did I mention that dried burnt wart will ignite? I can't see you being able to get that level of heat control with a wood fired mash tun or wart boil application. But if you do...........................I wanna hear about it! hehehe Keep us posted. There are at least two all grain brewers here with Canyon and I.
I forgot to mention.........if you get too much heat when you are boiling your wart you can carmelize the wart. You can achieve one of two things when that happens..........you totally ruin an otherwise great beer to be or.............you end up with flavor characteristics that will enhance your beer and make an average beer and awsome beer. Ahhh the variables........gotta love brewin!
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, point being that you need way more surface area for heat exchange to heat up your h2o fast. Wort is too sticky messy and you need just a straight forward kettle to be able to clean and, you need fine control of the fire to avoid B.O. (boil overs). 
