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workshop heating

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shipto:
I can put it off no longer so I nipped to our local B&Q and picked up a garden burner. (pic 1)
The plan is to place it outside the workshop and fit a heat exchanger to draw warm air into the shop thus the fire will not be endangering my shop.
So I took 2 plates and marked and drilled 9 holes then plama cut the holes for the exchanger tubes using a simple circle jig. Then it was just a case of welding in the tubes and that how far I got today.
Now here I would like advice should I flue around or through the pipes? the origional plan was to mount the exchanger with the pipes horizontal and the flue would be going around the outside of them but as luck would have it the 9 tubes equal around the same area as the hole in the top of the burner. so the question is do you think the unit would be more efficient drawing air through the pipe or from the area around them?

vtsteam:
I'll vote for around them because you'll increase turbulence of the hottest gasses. But you'll need to box it in and insulate, and also make it accessible for cleanout. The more heat you extract, the more you will collect ash and creosote because you'll cool the smoke in contact.

shipto:
thanks vtsteam I am going to box it in but havent got to that part yet. However you mentioning creating turbulance gave me an idea, so I have placed a plate on the top layer of pipes right in the middle. The reason being that now none of the hot gasses from the fire will be able to go up the chimney without hitting some part of the heat exchanger on its way out.

vtsteam:
Baffles are good, they increase residence. You can use more than one if you alternate them. Since you have a central one at the top, the next row down could have two side plates with a central space, etc. More complexity, though does increase clean-out difficulty. Everything is a compromise.

btw it's tough making tube plates. You did a good job with thin stock there  :thumbup:  :clap:

shipto:

--- Quote from: vtsteam on October 15, 2013, 10:17:57 PM ---
btw it's tough making tube plates. You did a good job with thin stock there  :thumbup:  :clap:

--- End quote ---
I wont show you the other side where the tubes stick out by 30mm then   :( not pretty.

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