solar kiln - with solar panel and revised for correct air circulation

by:Tunto     2020-02-18
First, pay tribute to the doctor.
Brian Bond, a student and employee at Virginia Tech (VT)
Department of Wood Science and forest products for the development of solar kilns and provision of Wells
Written Plan: of course, the VT plan has been revised.
The solar kiln is basically a box with a greenhouse roof that generates hot air through an internal solar collector.
Hot air blows through wood grain (2)fans.
It takes about one pile of wood (1)month to dry.
Revision of correct air circulation: I originally installed a fan outside the kiln to blow cool external air into the kiln.
After a visit to two sawmill2)
I realized that the fan should be installed inside the kiln in order to circulate the heated air inside the kiln.
Blowing in cool air will greatly reduce the kiln temperature and reduce the drying efficiency.
I built and installed an internal baffle with the fan mounted on the baffle and cut holes on the solar collector to allow recycling.
It will be easier to build the baffle before installing the greenhouse roof, but to live and learn.
Please refer to step 9 for baffle installation.
By adding the photovoltaic solar panels shown in step 10, the kiln is also fully Solar.
The wood is drying to build a 18 feet-year-old bank, Dolly, for transporting picnic supplies and picnic princesses to islands off the coast of Maine.
Learn about the place by Googling the Maine island Trail Association.
In order to transport picnic supplies, building only one kiln before building a ship is my typical, excessive
Enthusiastic method.
Thanks to everyone who voted for my guide in the green race.
Material list: enough wood construction structure
I used a combination of new and recycled materials, so there is no list;
Longer pieces and treated wood are stored on plywood
3/4 thick, external grade, 2 flat and stand-
10 feet x 6 feet;
Cut halflighting-
Foam Insulation-
2 thick, 2 sheetsplix foam packaging insulated fans-
16 inch with ring frame screws-exterior grade;
Various lengths
Green solar panels for solar collecting ovens-
65. The first question when building anything is where you will put it.
Solar structures require as much direct sunlight as possible, and your neighbors may not be very fond of cutting down their trees, even for the \"green\" project.
I also put it in the uphill position and adjacent to our workshop/garage so that in the future, when not drying wood or other items, the pipe work from the kiln can heat the workshop.
The position is a compromise between these functions.
The \"foundation\" is the lime stone on the uphill side, and the 4 inch by 6 inch pillar on the downhill side has been processed.
I set up the floor so that future plumbing works can intersect the adjacent workshop without hitting any wall brackets.
My relatives on the island of Fogo on the northern coast of Newfoundland also have a movement to move.
The reference title is \"tilt-
Robert Merlin details the sport in House launch, slide transport, potato trench and other stories in the fishing village of Newfoundland \".
\"I built the kiln so that it can be moved when needed.
The next problem is the size.
VT plan \"with size for 160 inch mm × 78 inch mm of base but I will size reduced to 144 inch mm × 48 inch mm × 12 feet mm × 4 feet mm.
To reduce the cost of the building, I chose these dimensions, the combined width of the roof slab is 12 feet and the width of the plywood is 4 feet.
The base is built from 4 inch treated wood cut to 6 inch 11 feet long and 9 inch long.
Due to termite problems in our area, all wood near the ground is treated wood.
I used 2 inch x 6 inch long treated boards 4 feet x 11 feet and screwed them at the end of 9 inch 12 feet wood to make a 4 feet x box.
The old woodworking policy is to measure cutting once twice.
In this box, I installed cross-members.
2 inch by 6 inch board and Simpson Strong connection
DingTalk with Simpson (
No code will be built without Simpson DingTalk. (
The contractor of the neighbor must remove and replace all the wrong nails on their project;
The weight of the structure is borne by these nails. )
I also use the remaining 4 inch by 6 inch material and connect with the galvanized lag screw. I counter-
Sink the lag screw in order to place the siding on the screw.
This may be too much, but I insulated the floor by making a \"shelf\" to support the insulation of the blue board.
The shelf is light wood screwed inside the frame.
The insulation is cut into a rectangle of the right size and placed on the shelf.
I prefer foam plastic compared to any fiberglass insulation because fiberglass is itchy.
Next, I installed 3/4 external plywood on the floor frame.
You can see here if you have built the frame Square (i. e.
, All 90 degree angles)
It will certainly be good;
Only about 1/8 from the square.
I was told that all carpenters make mistakes, but a good carpenter knows how to hide them.
To provide some protection, I painted the floor with some remaining stains.
The walls are basic, 2 inch x 4 inch column walls with columns on the 16 inch center.
There are titles on each opening;
The door opening on the back wall and two (2)side openings.
The side opening was built in case I wanted to dry the planks longer than the kiln or extend the plumbing work to the workshop.
I\'m still in two (2)
Measure the fan opening of 18 inch by 18 inch.
I also cut 4 inch by 4 inch columns diagonally and vertically, creating a title for the front and back walls that will match the slope of the roof.
With regard to the slope of the roof, the VT plan states that in order to achieve the best solar efficiency, the slope of the roof should be the same as the latitude.
It is about 39 degrees for us;
However, 45 degrees is easier to build and works properly, which I built as well.
I am a huge fan of packaging any structure because it allows you to control the airflow better, the airflow is all about this structure.
The packaging of the House revolves around the frame as tightly as possible and is bound in place.
The package is two (2)person job.
Guess which Big Box Shop I brought with me?
Next, I installed the side board on the package.
The side board is a wooden board salvaged from the old barn.
The barn has been renovated.
Being guided to unsafe places by tornadoes.
Thanks to our friends for retargeting us.
To match the roof slope, the top of the siding is cut. I used two (2)
Insulation material on the wall.
Similar to the floor, I cut the rectangles of the foam plastic and put them inside the wall nail, pushing up against the exterior wall.
Next, I placed a layer of reflective X bubble warp insulation throughout the frame.
I am trying to create a dead air space between foam plastic and foam packaging.
Aluminum Seal for seams in foam packaging
Straps and binding in place.
Excessive, excessive, excessive.
Since the bubble packaging can be punctured, I have installed some recycled cedar wall panels on the inner wall where dry wood is placed.
Cedar siding protects insulation during Wood handling as you always hit the wall.
The solar collector is a recycled metal roof sprayed
Dark green.
All of your graffiti artists may know the handle that Rustoleum sells, but it makes painting easier.
When it comes to graffiti, Banksy\'s work left a deep impression on me;
Almost like a precursor to the riots in London.
I cut the metal plate into length with a metal cutting wheel on 4.
There are a lot of spark grinder.
Put on your safety glasses. . . always.
I installed a wooden lip on the back wall to support the top of the metal plate and created a 2 inch by 4 inch \"shelf\" with a block behind to support the bottom of the metal plate.
Metal plates are placed on these racks and can be removed if required.
I left a gap of 8 inch between the panel and the front wall for airflow.
The roof material is called Polygal;
1 cm by 0 is plastic. 5 cm channels.
There is even a dual channel version if you need more insulation.
I run the channel vertically, but it looks like you can run in any direction.
The panel has exterior and interior, so pay attention when you remove the protective cover.
There is some kind of UV protection outside.
It is fixed in place by screws drilled through the aluminum bracket.
The screw has a neoprene gasket that provides water seal.
Plants and greenhouses (
While the shipping cost is almost as much as the material, it does a good job of preparing the panels and brackets.
Bracket or bracket is aluminum H-
Join two channels (2)
Panel and J-
Channel at both ends.
There are other roofing materials, but I am very impressed with the simplicity and functionality of Polygal\'s work.
During kiln operation, when the roof is cool, you can feel the heat coming out of the insulated wall.
It also looks very durable as it was hit by a serious hail this spring
Hail of no apparent damage. I also put myself
Sticky weather stripping between the frame and the roof to reduce air leakage, although stripping does make it more difficult to slide the roof panel into the bracket.
I used a tool knife to tilt the edge a little and the panel was easier to slide into the bracket.
Correction: for the correct air installation, please refer to the next step of installing the baffle.
I originally installed a cheap box fan with extension cord to pass the air through the kiln.
It finally stopped working;
It may be due to insufficient heat or power supply, or for other reasons.
This setting is not recommended due to potential electrical problems such as fire.
I do recommend getting professional electrical help.
In the last slide, I will show the second version of the fan system.
The end of the wood is coated with remaining stains to reduce excessive
The wood is dry near the end.
The wood is piled up in the kiln and there is an interval between the boards, called a sticker.
I nailed some Tyvek cloth between the bottom of the metal plate and put it on the top of the wooden pile to guide the air through the wooden pile.
To reduce the bending of the wood, concrete blocks are also placed on the wood.
According to the oven thermometer, the temperature is usually 50-
The outdoor temperature is 60 degrees Fahrenheit.
The drying process seems to work fine, but the real test will come when I buy the humidity timing.
The VT plan also discusses methods of moisture measurement using scales.
According to the VT design, an internal baffle is required so that the air can flow through the solar collector to heat, flow through a pile of wood, and then recycle the heating.
Some damp air is discharged through the vents on the lower side of the kiln.
I have read that the vents only need to be opened a little, and this is also observed on the solar kiln in the wood plant.
There is a balance between having enough ventilation to remove moisture but not losing too much heated air.
The baffle is a wooden structure that supports the fan, using refletimix as the baffle material.
The sunny side is painted black to absorb the sun\'s radiation.
I split the baffle in half because it\'s easier to handle and then overlap the reflection to create a continuous surface. I attach a frame to the inside of the kiln to support the baffle.
I also punch holes in the solar collector behind the fan to allow air circulation.
Before installing the greenhouse roof and before loading the kiln with wood, it would be much easier to build the baffle.
Don\'t make my mistake.
I installed a 65 watt photovoltaic solar panel to power the two (2)DC motor fans.
The solar panel runs the fan to make the kiln completely solar.
The panels are mounted in front of the workshop and are part of a small awning roof.
The panel is 53 degrees in the horizontal direction, which is the 38 Degrees recommended by the panel manufacturer plus the latitude of 15 degrees.
I built the roof frame around 53 degrees.
The grounding wire is fully installed on the frame of the future panel.
The wire extends from the panel to the kiln in the plastic pipe buried underground.
The stranded copper wire of 10 ad hoc working groups was recommended and some searches were conducted to find the stranded wires;
Most electrical suppliers only have solid copper wire.
I divided the power supply to two with the patch panel (2)fans.
I could have powered multiple terminals with a \"jumper shovel\", but this requires a special order, so I made a jumper with extra lines.
There are no batteries or other controls in the solar electrical system.
The panel is connected directly to the fan through the patch panel.
The fan only needs to run when the sun hits the solar collector and heats the air.
The operation of the kiln is automatically and naturally controlled by the sun.
Bob of wind power, Kansas, suggested installing the line.
Fans spin at high speed on sunny days.
My fan size is in the following formula \"Woodweb-
Select fan for solar kiln.
\"Airflow in Cfm = Space area between Wood * 125/min + leak 50%.
Due to the high estimate of the volume of wood, I calculated about 1000 cfm per fan.
The fan was purchased from the Kansas wind power company.
Boss Bob is a good resource. PS.
I also installed a short metal roof to block out the fan motor so the motor can be placed outside the heated box.
I twisted parts of the metal roof together to make the roof.
Christmas decorations hanging on short sides are a visual reminder not to hit the roof.
Although the next step is safety first. to-
Finally in this structure.
I purchased white oak planks from bonesteel portable sawmill and molding Co. , Ltd (
Rogerbonesteel @ bonesteelmillandmodding. com).
The board is 8 inch wide, 3/4 thick or 1 inch long, 8 to 12 feet long.
I got different thickness to reduce the amount of planing.
Dory plans to use different thicknesses in different locations.
I plan to connect the board end-to-end with finger joints at 18 feet Dolly.
Another experiment will be another structure.
If you are not far from the Paris Crossing in Indiana, bonestel sawmill is highly recommended.
Roger Bonesteel cuts wood on homes and adjacent properties, using a small modern mill with two (2)
Solar kiln for drying wood;
A good operation.
The ends of the wood need to be brushed to reduce excessive drying and inspection (i. e, cracking)of the wood.
VT recommends anchoseal as shown in the attached picture.
Anchoseal forms a wax coating on the pores at the end of the plate.
I measure moisture, temperature and humidity every day to help understand how the kiln works.
Moisture content was measured with lignommat E/D needle-free moisture meter.
The Lignomat meter measures a depth of 3/4.
The wood is ground 3/4 or 1 inch thick.
To be able to get repeatable measurements, I marked the measurement position.
Also learned to use the hold function to make measurements where you can\'t see the meter. I take three (3)
Read and record the highest value.
Place a dotted trend line through the data to estimate when the wood is fully dry. The semi-
Cute metal bug sculpture for hanging external thermometer.
On sunny days, the kiln operates at temperatures ranging from 50 to 60 degrees Fahrenheit above the outdoor temperature.
As you can see from the chart above, the moisture content is decreasing.
Kiln is working!
Enjoy your project and take care of everything.
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