mike Splendid

Thanks for this:
http://donkey32.proboards.com/thread/1023/accidental-discovery



This implies a slight upward slope with draw. That is now my experience.
A few degrees off horizontal is required. My latest test worked quite well. Ill post pics soon.

Perhaps on our part...(definitely me)...not a complete understanding of your goals.

TO HEAT A SMALL POOL
I am heating a 5gal propane tank filled with water (that is slowly circulating under slight pressure from a sump pump)

So, perhaps take what has been offered and build a working model to your specification next to "known working models" and compare..

Thanks. As soon as I see design that would fit my situation Ill be all over it

yet hope to post soon a dialogue on the traditional systems mentioned

Very much look forward to it

>Are you trying to heat living quarters or water?

A Small pool.

Yes I take your point about fighting physics. Perhaps the way to do this is to go up and then come down in another vermiculite board tunnel before entering the heat exchanger i Have built. ie no 55gal drum. contain the neat on the way back down... so wait, does that mean I could use a riser that is half as high?

Hello Cindy. No I dont have the book yet. Does it dicuss horizontal risers and a design like mine?

Can you could tell me how it is "far a field"?
Are you talking about dimensions or insulation?

Insulation, perhaps I could use one of these
http://www.zircarceramics.com/pages/fullproducts.htm
or vemiculite
http://www.engineeringtoolbox.com/insulation-temperatures-d_922.html
or Rockwool
http://www.rockwool.co.uk/why+rockwool-c7-/fire+resistance#
or Pyrogel
http://www.thermaxxjackets.com/products/insulation-materials/pyrogel-xt/
Microtherm
http://www.microthermgroup.com/low/EXEN/site/hightemperature-insulation.aspx

The weight of the bricks needs to rest on the insulation in a horizonatal riser design - another problem to solve



Are these the dimensions you are referring to?



What material do you make these out of? I assume it reflects heat and insulates?
THese are nice cores. If I layed it on the ground so the riser was horizontal and added a chimney, would it still work as well?

What I do not want is a design dictated by the 3ft riser like this:

IM trying to build this with a HORIZONTAL RISER out of bricks

OK. I here is my first (ever) Rogket design






The draw is mediocre as expected. I need a chiney. The heat is all dissapting to the fire bricks. I couldnt find vermiculite today. but the design works.

I think I need to shorten the secondar burn tube a lot and I need a MUCH bigger burn box.
I may wrap the bricks in fibreglass roof insulation tomorow. I hate that stuff but I dont know what else to use.

I need about 10x the energy out of this thing. Perhaps a 55gal drum as the burn box?

This is the bell?

Well I had to just go and get SketchUp



I assume the deisgn has the fire box and the secondary combustion area next to each other to compact the footprint.

I dont see a reason this could not be one long horizontal section. It would certainly flow air better that way...

.skp viewer
http://www.anycad.net/the-free-skp-file-viewer-skpviewer.html

I still cannot vie that file. Can you post a .jpg?

>but rather use bells.
wassat?


@Michael
I understand. I guess I am not clear why the riser is vertical? I assume because hot air rises and we want that to cause draw, but if that were true then what about the downdraft designs?

So if we can go donw whay cant we go horizontally and let the hot ir rising in the chimney section cause the draw in the system?


Added:

So to go a lkittle further into the logic here, I am heating a 5gal propane tank filled with water (that is slowly circulating under slight pressure from a sump pump)
I DO NOT want 5 gals of hot water perched atop a 5 ft riser. That meas building a large superstructure to hold it al and it ends up looking butt ugly and makes me nervous. I want the propane tank CofG LOW. Really I want it sitting at the end of a horizontal tunnel and for it to be the base of a chimney that encloses it.

The next part is that while I could cut and grind for week and whip out the MIG, I want to do this in a few hours with some fire bricks on the ground. Simple. Easy. Love it! So Really I want a long tunnel that is part firebox and part "riser". My idea is to run a number of smalled metal tubes into the "riser through the firebox to provide more air for the secondary burn. This will heat the air on the way through the firebox and its easy to lay some lengths of metal pipe at the base of the tunnel protruding out.

I am just not sure about the functioning of the "riser" portion of the tunnel.