I, of course, modified the VT plans. The solar kiln is basically a box with a greenhouse roof that generates hot air with a internal solar collector. The hot air is blown through the wood with two (2) fans. A load of wood should take approximately one (1) month to dry.
Revision for correct air circulation: I had initially installed the fans on the outside of the kiln, blowing cool, outside air into the kiln. After visiting the sawmill which had two (2) solar kilns and rereading the VT plans, I realized that the fans should be installed inside the kiln to recirculate the heated air within the kiln. Blowing in cool air would lower the kiln temperature too much and reduce the drying effectiveness. I constructed and installed an interior baffle with the fans mounted on the baffle and cut holes in the solar collector to allow for recirculation. It would have been easier to construct the baffle prior to installing the greenhouse roof but live and learn. Refer to Step 9 for baffle installation.
The kiln is also made completely solar with the addition of a photovoltaic solar panel shown in Step 10.
The wood is being dried to build an 18 foot Grand Banks dory which will used to haul picnic supplies and picnic princesses to islands offf the coast of Maine. Google the Maine Island Trail Association to get a sense of the place. Building a kiln before building the boat in order to haul picnic supplies is my typical, over-zealous approach.
Thanks to all who voted for my Instructable in the Green Contest.
List of materials:
Enough wood to build structure - I used a combination of new and salvaged materials so don't have a list; the longer pieces and treated lumber were store bought
plywood - 3/4 inch thick, exterior grade, 2 sheets
Polygal and brackets - 10 ft x 6 ft piece; cut in half
flashing - aluminum
styrofoam insulation - 2 in thick, 2 sheets
Reflectix bubble wrap insulation
DC fans - 2, 16 inch with ring frame
GRK screws - exterior grade; various lengths
paint - green for solar collector
photovoltaic solar panel - 65 watts