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Post by comradesimba on Oct 22, 2009 11:06:23 GMT -8
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Post by Donkey on Oct 22, 2009 17:33:23 GMT -8
Yeah.. Cool. I like how you make use of any old trash that's laying around.
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Post by Donkey on Oct 23, 2009 0:54:18 GMT -8
Have you seen this image yet? I've built something much like it out of adobe brick and an old 20 gallon electric tank from the dump. Works like a charm! No barrel, doesn't radiate the heat away, gives more to the water.
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Post by comradesimba on Oct 24, 2009 17:32:28 GMT -8
I am a true junker. The idea is if it can work built from absolute debris with seriously sloppy techniques used during construction then a model built carefully with quality materials ought to perform well. Also, why waste time and money knocking a new idea together.
Yeah, I saw the image the day I heard about this forum. Suggests that a horizontal tank will work just as well, but who knew that gasses passing across the top of a tank was a waste of energy? Live and learn, that's what this forum is all about eh?
I'm hooked on the horizontal design because I'm going for a wide bench on top. Future plans include a triple pipe running through a cob platform wide enough to heat a waterbed. Heh, heh, when doom comes I want a couple of creature comforts. Probably wind up using a rocket waterbed to incubate chickens... we already use a corner of the bed to fast rise sourdough starter...
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Post by Donkey on Oct 24, 2009 20:15:10 GMT -8
Sweet.. I like the horizontal tank thing, makes sense, takes up less vertical room, building a bench over it is genius. What I didn't see in the images on yer site is a relief valve.. That's the one gizmo that I DON'T trust getting second hand, neither do I leave it out. When you get the system right, it won't be TOO hard to boil the tank, especially using an eight inch system. Double especially if you dump the barrel, and pipe (insulated) it right into the tank chamber..
Ah, but a second look at yer blog gives the info that you want a double use system.. Room heat AND hot water.
Err.. something I've found is that these things work better when the chimney/exhaust is as low as you can get em. Try putting the exhaust pipes down low at ground level but keep the rest of your design the same.. See what happens.
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Post by comradesimba on Oct 25, 2009 15:23:42 GMT -8
Idealy, the tank will go from 80 or so degrees to 120 in about an hour. Then refilling and running the stove for a couple more hours to heat up all the thermal mass. Then shut off until the evening's firing.
30+ gallons of hands-free120+ degree hot water on demand 24/7 is a luxury product of our modern age. It's not unreasonable to time bathing events to when the water is hot twice a day.
During the demo it was apparent that something wasn't right with the system - had smoke backing up out of the feed tube, so I put the ducts up higher to create a draw. Turns out that all the rain we had between the first and second demo when the core was left out in the middle of the parking lot floated unburned charcoal to the very bottom of the heat riser - thus blocking airflow. Oops - missed that crucial aspect, lol.
There will be an 8 inch duct beyond the water heater "bench", and I think I may run an additional 8 incher to one side of the bench with dampers at the end of each run to force the exhaust where it needs to go - through the water heater part until we hit 120 and then shunt it off to the other duct for heating purposes.
I always bite off more than I can chew...
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duh
New Member
Posts: 1
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Post by duh on Nov 4, 2009 18:27:49 GMT -8
I think you're on the right track for hot water made with a rocket. For many years I've had the water heater tank about an inch off the top of my woodstove. Has worked flawlessly, and in the summer it acts as a holding tank so ground water can gain room heat prior to going to a propane demand unit. For what it's worth, here's a photo: www.diesel-bike.com/System/images/DSCF1560.JPG
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