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  #81  
Old 04-13-2010, 04:35 AM
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Location: N. KY
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Default Re: 81 Inch First Build (and first post)

Funny, while reading the post I just put up, the answer dawned on me....instead of tubing to pick up the heat....set a tank on the side, low on the dome (not leaning on the dome itself)....open to air, so no pressure, welded up of heavy steel. I could put a toilet fill valve in it to keep it from running dry. Something with a footprint like a five gallon bucket. I have a rocket scientist friend that can do the math to figure out the size can needed to heat the floor..
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  #82  
Old 04-13-2010, 04:49 AM
Il Pizzaiolo
 
Join Date: Mar 2009
Location: USA
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Default Re: 81 Inch First Build (and first post)

hey wind,,
THats way better then what I was thinking... I was gonna say maybe you could put a third zone in and either send it outside into the ground, or somehow back into the oven.. gonna have to think about this one,, Im sure it can be worked out...

Cheers
Mark
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  #83  
Old 04-14-2010, 04:02 AM
Il Pizzaiolo
 
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Default Re: 81 Inch First Build (and first post)

Hey Wind,
I was just on ebay,, Look under Outdoor wood boilers, they have all kinds of parts and things needed to build one.. they have a set of plans for a side arm boiler that sounds exactly what you are talking about,,,
Cheers
Mark
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  #84  
Old 04-14-2010, 07:44 AM
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Join Date: Jan 2008
Location: FL
Posts: 62
Default Re: 81 Inch First Build (and first post)

I would think that an oven with that mass, no matter how well insulated is going to give off a great deal of heat into the building. I would think that the trick would be to circulate that heat where it is needed.
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  #85  
Old 04-30-2010, 02:40 AM
Il Pizzaiolo
 
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Default Re: 81 Inch First Build (and first post)

Hey Roger..
We havent heard from you in a while.. How is the oven coming ??

Mark
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  #86  
Old 05-01-2010, 04:32 PM
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Default Re: 81 Inch First Build (and first post)

Mitchamus, what is that whitish/gray stone matl you used for the floor of the oven?
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  #87  
Old 05-01-2010, 10:41 PM
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Default Re: 81 Inch First Build (and first post)

WOW!!! Now that's an oven. Yep, I was thinking about some sort of water heating system too, but couldn't get my head around that "excess" heat problem. An open, vented system would work, but I'm still wondering about those times when you don't need all that heat in the building and you shut down the pumps? That hot water's gotta go somewhere?

I am going to install a jury-rigged steam injection thingy just a bit of pipe (no dependent swags) running across the dome that I plan to squirt water into, terminating in a cast iron receptacle of some sort. If it's not steam before it gets into the oven it will certainly be that way when it hits the pot on the other end of the trip.
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  #88  
Old 05-02-2010, 05:41 AM
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Default Re: 81 Inch First Build (and first post)

Quote:
Originally Posted by lwalper View Post
WOW!!! Now that's an oven. Yep, I was thinking about some sort of water heating system too, but couldn't get my head around that "excess" heat problem. An open, vented system would work, but I'm still wondering about those times when you don't need all that heat in the building and you shut down the pumps? That hot water's gotta go somewhere?

I am going to install a jury-rigged steam injection thingy just a bit of pipe (no dependent swags) running across the dome that I plan to squirt water into, terminating in a cast iron receptacle of some sort. If it's not steam before it gets into the oven it will certainly be that way when it hits the pot on the other end of the trip.

Regarding the "heating" system, it would have to be drained and dry, but I am going to try to heat my domestic hot water for dishes with it, so mine may never be drained. And when the hot water needs are satisfied, the water will just flash off the surface of the tank on the oven.
On the steam injection, be careful with how you introduce the water, cause the steam will come right back at ya when the water hits the hot pipe, the pressure will go both ways in the pipe.

Finally got some time to lay a few more brick last night. I am out of my "new old stock" firebrick and had to buy 250 to continue..these standard size are alot smaller than my old ones.

Roger
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  #89  
Old 05-02-2010, 05:00 PM
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Default Re: 81 Inch First Build (and first post)

A coil above the firebrick would give you some future options to heat water. If there is no water introduced in it and it is left open to the air it should not cause any problem until you determine what you want to do The same should apply to a tank..
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  #90  
Old 05-02-2010, 07:05 PM
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Default Re: 81 Inch First Build (and first post)

Quote:
On the steam injection, be careful with how you introduce the water, cause the steam will come right back at ya when the water hits the hot pipe, the pressure will go both ways in the pipe.
I had considerd that too. Had planned on injecting water through a small diameter (1/4") into a larger, maybe 1 inch copper tubing. Just the mechanics of small to large diameter transition will take care of a lot of that back pressure, just like a hydraulic jack. On the other hand, depending on the amount of water squirted into the oven, I was really wondering about the possibility of hot steam belching back out through the open door. Doing the math, a cup of water expanding 1000 times its liquid volume to live steam, will displace a LOT of hot air. It's gotta go somewhere — don't stand in front of the open door when you squirt that water down the pipe. Yikes!

Some sort of heat exchanger/water heater would definitely be nice. Since this thing gets so hot, a coil seems like it would be counter intuitive with dependent loops bubbling and boiling and spitng steam as they are occasionally allowed to dry out. Maybe an "S" shaped arrangement would work — something that would drain completely?
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