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1

Home Made / Re: New Guy with a new build

« on: November 18, 2011, 07:03:30 PM »

A belated thanks for the info peacmar. Can anyone point me inthe right direction on heat exhangers? Water to air that is. Any recomendations or things I need to be looking for? I know what size. I just need a good brand. Thanks!

2

Home Made / Re: New Guy with a new build

« on: November 09, 2011, 02:16:42 PM »

I finished welding up the firebox into the water jacket on Sunday. Aired it up and had about 3 or 4 pinholes at weld bead starts or stops. Welded them up and soapy water tested everything. My door is fabricated. I need to finish the hinges and put the stack on it. I am trying to do this one piece at a time. I have now turned my attention to the inside plumbing and circulation system. Keeping with the theme of simple, my intent is to keep the plumbing one simple loop. It will flow as follows: OWB outlet to house, circulation pump, heat exchanger, out to OWB inlet. I will be running 1" lines. The OWB is going to be less than 100 ft from the house and the OWB outlet will be about 10-12ft higher than the pump and heat exchanger. I am probably going to use a Grundfos pump. I have experience with Grundfos products in other applications and they seem to have a good reputation as circulation pumps. I have done some research about which model to use. UPS15 series and the UPS26 series are what I have been looking at. It does not appear that the UPS15 pump will give enough flow at what head I will be pushing. I definately do not want to undersize my pump but from what I understand, oversizing it can cause problems too. Any input is appreciated. Thanks.

3

Home Made / Re: New Guy with a new build

« on: October 27, 2011, 06:28:12 PM »

Rosewood, After re-reading your post I think I understand. If you are looking at the tank from the side, profile view. The exhaust would exit at the top rear of the firebox.( The vertical pipe in the firebox would be in the bottom third of the chamber) The exhaust would then tee inside the water jacket toward the front of the tank and the other side of the tee would go out the back with an access port for cleaning. The exhaust would travel horizontally through the water jacket to the front and tee again. The pipe would turn vertically out of the water jacket and to atmosphere. The other side would exit the front of the tank with and access port for cleaning. I like the idea but it as you point out it would require a fair amount of additional cutting and welding.
What if the exhaust exits the firebox horizontally and turns up vertically INSIDE the water jacket and then exists the top of the tank. This will give me about one foot of horizontal and 3 feet of vertical piping inside the water jacket. It would allow me to still preweld to the firebox and the weld of the exhaust to the water jacket would be at the top where a potential leak would not be a big problem. Would I extract much heat out of the vertical pipe or would the exhaust escape too fast without much heat being captured?
Thanks for the ideas.

4

Home Made / New Guy with a new build

« on: October 25, 2011, 09:28:06 PM »

So after much deliberation and research I decided to build my own OWB. Rather simple design, tank in a tank. The outside water jacket is 4'x5'8" . The fire chamber will be 2'6"x 4'6". It will have a blower. I am unsure about the exhaust design. I have noticed some come straight down through the top and position the inlet about 2/3 of the way down in the fire box. I want to run my exhaust out the rear. That way I can weld in the pipe on the firebox from both sides and pressure test the firebox. Then slide the fire box with exhaust into the water jacket. Weld in the firebox and exhaust and pressure test the water jacket. I am thinking that the exhaut will still be in the bottom 1/3 of the firebox. After the exhaust exits the water jacket it will tee up with an access on the back of the tee for cleaning. Does anyone see a problem with this? I have my stand fabricated and the water jacket welded to the stand. The next step is cutting holes for the firebox to sit in the water jacket and the holes for the exhaust. I also plan on offseting the firebox in the water jacket. Meaning there will be 6" of water under the firebox and 12" above. My theory is that this will give me a larger quantity of water where the most heat is. At the top of the firebox. Make sense? Any input would be appreciated. I will try to get some pictures up tommorrow. Thanks in advance for any advice.