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  • Sberry
    started a topic Wood furnace

    Wood furnace

    I started it today after scrounging parts and a core old stove that has seen its share of modifications from several different installations. I didnt want to start from scratch so I am adapting and took the plasma to it to make changes, spent an hour with a grinder and am getting ready to retro fit the features I need, enlarge the door, add some baffles and put it into a jacket for forced hot air outside wood burner. These are some of the core parts, junk laying on top of the stove.
    Attached Files

  • JTMcC
    replied
    Originally posted by fun4now View Post
    JTMcC
    only code is the "JTMcC don't burn the shack down code of 2008"



    thats my kind of code.
    around here there is a loop-hole, any addition under 100 sq. ft. is good to go as long as no plumbing is in use. that explains why the kids new rooms are 7'X11-1/2' ( inside with outside of 8X12 ) instead of 10X12.
    so far the shack is not burned down.

    i suspect it was intended to cover mud rooms, or draft stops to keep the cold out in winter. but it works good for me.


    For every county beaurocrat, huddled in a dark back office, trying to regulate the common man out of existence......................................... ..
    there's a guy plotting, and scheming, to jump thru each and every loophole he can find


    JTMcC, Happy Day after Xmas!!

    Leave a comment:


  • fun4now
    replied
    JTMcC
    only code is the "JTMcC don't burn the shack down code of 2008"



    thats my kind of code.
    around here there is a loop-hole, any addition under 100 sq. ft. is good to go as long as no plumbing is in use. that explains why the kids new rooms are 7'X11-1/2' ( inside with outside of 8X12 ) instead of 10X12.
    so far the shack is not burned down.

    i suspect it was intended to cover mud rooms, or draft stops to keep the cold out in winter. but it works good for me.

    Leave a comment:


  • jcirafic
    replied
    Thanks for sharing Sberry. You did some great work, we (I) learned alot. Merry Christmas..

    Leave a comment:


  • Sberry
    replied
    Well I have a minute here. This project really was a compromise and I was distracted so it took a couple trys to get it working. First it worked very well, too well in some sense and things were fine until I got a couple bright ideas, one was to insulate the thin wall chimney which helped over heat the thing, blew paint smoke all over, cooked my thermostat (fortunately was working on other fan options) and needed to cool it down. It burned some paint off the panels as the top was really too close. Once it over heat the thing is so heavy that it took a good while to cool it down. I pulled it back out and to the shop for a re-man, I increased the clearances to the top and changed the ducts to full size, this time after that experience I was able to figure out a better thermostat location and wire routing. Now I didn't hook it to the return air but brought it in from the outside, figured it would always purge the place with fresh, that worked to some extent. I changed out that noisy fan for a blade type and when it was cold out the temp rise was marginal. Next morning I figure to slow the fan and increase the thermostat temp, that work pretty good and was a simple type fix that seems to work well enough at the moment. After I change the top cabinet clearance I also added a 16 ga mild steel baffle (un-painted) to reduce hot spot, after some trial and error the thing actually works pretty well all in all. The learning curve was high and the thing was time consuming and was really one of those things that eat time when I could have been making money but now the comfort is nice and it really reduce the gas usage.
    I really had other plans when I dreamed this up and this was a stop gap, if I had followed thru my original design would have worked better. Most things I do I hit right up the first time but this started on left foot and small errors compounded, not that the end result was bad but it certainly could have been thought thru better from the start including rounding up some more suitable materials, I really salvaged to the extreme, I finally got some real duct from a bud which made it a lot easier. Now its super quiet at any rate and with a little learning I can tune the temp but uses a bit more wood as its heating cold air instead or return air. If I had it to do over again I would certainly give a bit more thought to it up front.

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  • JTMcC
    replied
    Thanks but I'm far, far away from Minnesota.
    I'm in (very) rural Northern Arizona, where basements are few and far between, and the only code is the "JTMcC don't burn the shack down code of 2008"

    JTMcC

    Leave a comment:


  • wrench3047
    replied
    Originally posted by JTMcC View Post
    Any progress?

    I'm thinnin about a pipe furnace inside a larger pipe sleeve with insulated ducts going in with hot air and one going out with return air. Mine would be on a self contained skid that I can set/remove with a forklift and wouldn't be fancy enough to plumb into the existing ductwork, just feed in thru a window with louvers. The window sports a water cooler in the summer which works well in our dry desert climate.
    I'm also thinnin about putting a large amount of heavy (2") iron in there to soak the heat and only run it at night. We warm up pretty good during the days here but have quite a few moderatly chilly nights in the 10 to 15 degree range. Not stupid cold, but still calls for some heat.

    JTMcC.

    of course with a blower, maybe up at the window instead of at the furnace. I'm planning on putting this thing at least 15' from the house.
    I'm not sure were you are but Minnesota law at the time said this type of unit needed to be in basement w/ certain amount of distance from walls certain this and that. or i think it was 50' from the house if outside inside another structure. It was a while ago but should check up on local yada yada cause i know my father was talking about a large fine if he didn't do it the "right way"

    Leave a comment:


  • Sberry
    replied
    Yes, it has got cold again here and its back in service, I will update this when I have a clear thought or 2 to spare.

    Leave a comment:


  • JTMcC
    replied
    How about an update now that this has been in service for a while.

    How often do you have to load it? At what temps?
    Does the little dryer fan move the air over those distances?
    Plus any other info you find usefull.

    According to the weather chic this heater has had it's work cut out lately.

    JTMcC.

    Leave a comment:


  • Sberry
    replied
    I missed a couple of pics along the way, will get one of the finished,(semi finished) project shortly. Now the big problem,,, figuring how to keep it under 85 in the place, ha I also need to work on muffling the return air intake noise a bit. It warmed up near freezing, wish I would have had it a week ago when it dropped in to the low teens at night.

    Leave a comment:


  • JTMcC
    replied
    Originally posted by fun4now View Post
    Flyingpig
    By the way, Ive been thinking of doing the same thing but using water as the medium. Ill have to run mine 50 ft or more from the house. keep us posted on your progress. it sounds like you are planing similar to my plan, although i will be closer to the house. i need the house as a wind block, its crazy windy here.

    JTMcC & Sberry
    do you guys get a lot of snow ??? or just cold ?? have you considered some form of solar heat options ??
    there are some simple drop in a window systems that look promising as well as some more complex options that have a better heat collection system.

    i added a few pic's
    the first is a simple out the window idea that lets cold air in and as it heats the air in the front it pulls in more cold as the hot flows out the top. sorry i had to make a quick drawing of that one, i cant find the pic ??

    the next 3 are of a design thats supposed to collect maximum heat all day long due to a convex reflector shining on an air heat chamber, this one requires a forced air system to move the heated air. the wright-up said forced air was the way to go, but it looks like heating water might be a better idea ??

    unfortunately i get very little sun and lots of wind, so my hopes for the solar option are not looking too good, but i may look into the forced air one.

    I get a ton of sun. Minimum snow. I've looked pretty close (years ago) at passive solar but I think I'd get too much heat during the day. Our days warm up pretty nice as it is, just let the sun shine in the windows.
    My old shack is poorly insulated, I'm just looking to put some nightime heat into the place and like Sberry I'm not interested in putting forth too much time/effort, just a simple thing.
    Assuming I have the time to even do that.

    JTMcC.

    Leave a comment:


  • Sberry
    replied
    I agree there is a lot of room for improvement both with this idea and other options. My whole deal is I want it now and wanted it cheap to replace gas as well as add some comfort. My Dads "hobby" is cutting wood, we are equipped to do it so as soon as I get off my tail with a couple things I am going to finish this, about a day yet with 2 men.
    I would be changing design and going to hot water if I was building from scratch and adding some solar features, energy stuff in the design, this is strictly a hi function kind of thing and at the moment I dont want to fool with modifications to this existing structure. This is dirt simple, has direct payback and quickly adds some comfort.

    Leave a comment:


  • lars66
    replied
    Originally posted by fun4now View Post
    Flyingpig
    By the way, Ive been thinking of doing the same thing but using water as the medium. Ill have to run mine 50 ft or more from the house. keep us posted on your progress. it sounds like you are planing similar to my plan, although i will be closer to the house. i need the house as a wind block, its crazy windy here.

    JTMcC & Sberry
    do you guys get a lot of snow ??? or just cold ?? have you considered some form of solar heat options ??
    there are some simple drop in a window systems that look promising as well as some more complex options that have a better heat collection system.

    i added a few pic's
    the first is a simple out the window idea that lets cold air in and as it heats the air in the front it pulls in more cold as the hot flows out the top. sorry i had to make a quick drawing of that one, i cant find the pic ??

    the next 3 are of a design thats supposed to collect maximum heat all day long due to a convex reflector shining on an air heat chamber, this one requires a forced air system to move the heated air. the wright-up said forced air was the way to go, but it looks like heating water might be a better idea ??

    unfortunately i get very little sun and lots of wind, so my hopes for the solar option are not looking too good, but i may look into the forced air one.
    I made one of those window boxes years ago and it worked well on sunny days. If I remember right there was 128 degree air coming out under ideal conditions. Matter of fact the guy down the street was so impressed he made me an offer I couldn't refuse and I never got around to building another one.

    Leave a comment:


  • Bob Warner
    replied
    How about heating used oil? Wouldn't that hold heat longer than water? Or a container covered inside with rocks that will heat up and hold heat and release the heat over a long period of time. Seems you could avoid the heat spike while burning also.

    Leave a comment:


  • Flyingpig
    replied
    fun4now, I was going to buy one of those high dollar outside units with my neighbor (a welder) and share the heat. Im getting laid off my cement hauling this week so money is now very short. I got to thinking (along with my wifes prodding) why not just weld my own? I know it wont be nearly as technologically advanced but it should still heat water. Im just in the planning stages now and will no doubt steal ideas from several production units.

    Leave a comment:

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