Solar kiln construction
1. Are glass panels better than plastic (transparent)?
2. For a kiln size of 18 by 14 feet, (with a maximum height of 12 feet), are two air outlets at the bottom and two air intakes at the top sufficient?
3. Should the fans be placed at the air outlet points?
4. Will the efficiency increase if the side walls also have glass or plastic panels? Otherwise, could it be a brick wall?
You can't go wrong with Dr. Gene's design. I built one 10 or 12 years ago, and have been extremely happy with the results.
The only change that I would make would be to construct the rear wall so that it could be opened completely for easier loading. We made the mistake of putting rectangular doors in the end walls, and have enjoyed numerous bumped noggins as a result.
Also, we were fortunate to find a greenhouse supply store which had some ribbed fiberglass glazing on hand that they had special ordered which was never picked up. We got an excellent price on it, and have had the same glazing in place for the life of the kiln. It is showing its age now, but it still keeps the rain out .
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