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Old February 16th, 2012, 11:44 AM
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Default copper around stack preheater

Hello; This may be an age old question but I was thinking of wrapping 1/2 inch copper around my stack with a control valve over the pan to control flow rate as a preheater. Seems a shame to waste all that stack heat. Any tips positive or negative would be appreciated.
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Old February 16th, 2012, 12:00 PM
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It will help alittle, just remember, not to close, yet not to far away.
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Old February 16th, 2012, 12:06 PM
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Many have done this, and it is well documented on the Mapletrader if you search there. It will heat your sap, but has some perils: If you run out of sap, even for a short while, it can scorch in the tube. If you stop the flow, the sap can boil in the tube and spray out with potential harm to standers-by.

The importance of preheating is often overstated. In the best possible case, with near freezing sap being heated to near boiling before entering your pan, you will gain less than 15% on your efficiency/rate. Typically much less gain is realized.

I do have a preheater, but it is a much safer and controllable type that uses the waste heat in the steam rising from the pan.
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Old February 17th, 2012, 06:11 AM
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vapor lock
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Old February 17th, 2012, 07:46 AM
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we use copper in side are flue. We use a small pump. There is about 25-30 feet 1/2 copper we started at the top went in then came down flue pipe. we leave 1 or 2 gallons at the end of cooking. works well 40 in and 180-200 degrees out.one ballvalve too maintain heat and level in pans.
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Old February 17th, 2012, 08:54 AM
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On my old barrel evaporator, we used a copper tube coil around the stack. I had a "T" at the bottom near the control valve with a straight pipe that went up higher than my head tank, and back down to the pan (like an elongated horseshoe). Any vapor lock situations would be relieved at this bypass and go directly into the back pan. We also wrapped the copper coil and stack with aluminum foil. I took a digital temp reading of the sap exiting the valve, and we were at about 205 degrees on entry to the back pan.
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Old February 17th, 2012, 10:21 AM
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Mill Village , what size of copper did you use? And how many wraps around your stack did you use?
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Old February 17th, 2012, 10:25 AM
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This is what I got so far, it is 12 turns of 1/2 inch copper
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Old February 17th, 2012, 08:22 PM
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Sappy did I ever mention the time a friend and I were making a coil just like that. We went out back behind his shop and found the nicest roundest straightest maple and wrapped the soft copper around it it was so nice. About that time he looks up and looks at me and it dawns on us.....................................SH*t get the chain saw
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Old February 17th, 2012, 11:16 PM
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I put a valve then a union before the coil that way I can disconect the coil if I need to. I have two 1/4" ID X 20' coils and I'm getting about 170 deg.
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