The Forestry Forum is sponsored in part by:

iDRY Vacuum Kilns


Forestry Forum
Sponsored by:


TimberKing Sawmills



Toll Free 1-800-582-0470

LogRite Tools



Norwood Industries Inc.




Your source for Portable Sawmills, Edgers, Resaws, Sharpeners, Setters, Bandsaw Blades and Sawmill Parts

EZ Boardwalk Sawmills. More Saw For Less Money!

STIHLDealers.com sponsored by Northeast STIHL


Woodland Sawmills

Peterson Swingmills

 KASCO SharpTech WoodMaxx Blades

Turbosawmill

Sawmill Exchange

Michigan Firewood, your BRUTE FORCE Authorized Dealer

FARMA


Baker Products

ECHO-Bearcat

iDRY Wood Lumber Vacuum Drying for everyon

Nyle Kiln Dry Systems

Tally-I/O




Author Topic: Random thought for a solar kiln  (Read 970 times)

0 Members and 1 Guest are viewing this topic.

Offline Crusarius

  • Senior Member x2
  • *****
  • Posts: 2813
  • Age: 42
  • Location: Canadice, New York
  • Gender: Male
  • Lost in....
    • Share Post
    • RockModified.com
Random thought for a solar kiln
« on: March 25, 2019, 12:35:50 PM »
So I had a very random thought on my way to work this morning. 

I want to build a solar kiln. 

I started wondering what would happen if I found a 6' diameter culvert pipe, painted it black and put vents and fans on each end of it. Then place it in a very sunny area.

Anybody have any thoughts how that may work? I would expect to be able to get some pretty high temperatures inside

If it doesn't work for drying wood maybe it will work for sterilizing?

Offline GeneWengert-WoodDoc

  • Senior Member x2
  • *****
  • Posts: 2722
  • Location: Bishop, GA
  • Gender: Male
  • Author of "Sawing Hardwood Lumber"
    • Share Post
    • Book on Sawing hardwood Lumber
Re: Random thought for a solar kiln
« Reply #1 on: March 26, 2019, 04:30:10 AM »
You will get some heating, but the 50% of the pipe not exposed to sunlight will lose a lot of heat and so you will not have much heat for evaporation.  Also, the solar input will be the shadow that the pipe casts.  So the areas that are not getting perpendicularly close to perpendicular sunlight will also have a net lose of energy.
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Offline Southside

  • Senior Member x2
  • *****
  • Posts: 5412
  • Age: 47
  • Location: Wilsons (Dinwiddie County), VA
  • Gender: Male
  • Have a plan to saw every log you meet.
    • Share Post
Re: Random thought for a solar kiln
« Reply #2 on: March 26, 2019, 07:41:39 AM »
I think it will work great, for catching snakes.. :D
Franklin buncher and skidder
JD Processor
Woodmizer LT Super 70 and LT35 sawmill, KD250 kiln, BMS 250 sharpener and setter
Riehl Edger
Woodmaster 725 and 4000 planner and moulder
Enough cows to ensure there is no spare time.

Offline doc henderson

  • Senior Member x2
  • *****
  • Posts: 2578
  • Age: 59
  • Location: Hutchinson, Ks
  • Gender: Male
  • Evil Prevails when Good Men Standby and Do Nothing
    • Share Post
Re: Random thought for a solar kiln
« Reply #3 on: March 26, 2019, 07:52:31 AM »
could make and underground shooting range/storm shelter.  So if I understand gene correctly, you have to be able to put heat in, and insulate or trap the heat inside.  to sterilize you could use a outdoor wood furnace but would need to insulate.  then the question is, is this the size you want and is it easy to load and unload.  do you have the pipe already?  I respect and relate to wanting to use things you have access too.  Creative Idea.
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Offline Crusarius

  • Senior Member x2
  • *****
  • Posts: 2813
  • Age: 42
  • Location: Canadice, New York
  • Gender: Male
  • Lost in....
    • Share Post
    • RockModified.com
Re: Random thought for a solar kiln
« Reply #4 on: March 26, 2019, 07:59:08 AM »
It was more of a curiosity question. I do not have the pipe but I started thinking I could probably get an old decommissioned pipe from the highway garage and fit small loads in it.

I mostly was thinking sterilization tube because of all the horror stories I hear about ppl buying bug infested wood.

This morning I was thinking about it a little more. (I need a shorter drive to work) :). But I could put the pipe up in the air and build a firebox and just run the exhaust from the fire box under the main pipe for supplemental heat.

The primary goal was sterilization, but then I got to thinking if I am going to sterilize it why wouldn't I also be able to use it to dry. I do wonder what kind of temperatures I could get in that pipe. Without supplemental heat.

What Gene says makes a ton of sense. anything that is not gaining in direct sun will be losing. That would definitely mess up the efficiency. I guess the trick would be proper orientation so the sun shoots down the length of the pipe.

Offline doc henderson

  • Senior Member x2
  • *****
  • Posts: 2578
  • Age: 59
  • Location: Hutchinson, Ks
  • Gender: Male
  • Evil Prevails when Good Men Standby and Do Nothing
    • Share Post
Re: Random thought for a solar kiln
« Reply #5 on: March 26, 2019, 08:11:11 AM »
You did say random thoughts.   :).  I think it could work. in fact you could orient it at a 45 angle sticking up out of the ground.  the back half could be insulated, the front ( facing the sun)  could be flat black.  If it is galvanized, it would slow the degrade. It would naturally draft like a chimney. but how would you load and unload that bad boy.  If you get free pipe, and have the equipment to handle and move the pipe, then your COO may nix it cause it does not look nice in the yard.   :(  could use sawdust as insulation if you can keep it dry.  I do not think the zinc oxide will get hot enough to give you "fume fever". 8)
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Offline WDH

  • Forester
  • Administrator
  • *****
  • Posts: 29296
  • Age: 65
  • Location: Perry, GA
  • Gender: Male
  • April 1998 - August 2008
    • Share Post
    • hamsleyhardwood.com
Re: Random thought for a solar kiln
« Reply #6 on: March 26, 2019, 08:14:06 AM »
If you go the firebox route, and it does not do what you want it to do drying wood, you could always cook a hog in it, or several ;D
Woodmizer LT40HDD35, John Deere 2155, Kubota M5640SU, Nyle L53 Dehumidification Kiln, and a passion for all things with leafs, twigs, and bark.  hamsleyhardwood.com

Offline Crusarius

  • Senior Member x2
  • *****
  • Posts: 2813
  • Age: 42
  • Location: Canadice, New York
  • Gender: Male
  • Lost in....
    • Share Post
    • RockModified.com
Re: Random thought for a solar kiln
« Reply #7 on: March 26, 2019, 08:19:07 AM »
If you go the firebox route, and it does not do what you want it to do drying wood, you could always cook a hog in it, or several ;D.  

The trick is getting my co-workers to come down.... :) wait what kind of hogs are you talking about? :)

Offline Crusarius

  • Senior Member x2
  • *****
  • Posts: 2813
  • Age: 42
  • Location: Canadice, New York
  • Gender: Male
  • Lost in....
    • Share Post
    • RockModified.com
Re: Random thought for a solar kiln
« Reply #8 on: March 26, 2019, 08:21:59 AM »
Doc, thats not a bad idea. would not be hard to put it on a swivel stand. Would almost look like a giant cannon. :)

have it like a teeter totter. hinged in the center, flip it flat to load then rotate it up and allow convection to do its thing. The water would drop to the bottom and warm moist air out the top.

Offline doc henderson

  • Senior Member x2
  • *****
  • Posts: 2578
  • Age: 59
  • Location: Hutchinson, Ks
  • Gender: Male
  • Evil Prevails when Good Men Standby and Do Nothing
    • Share Post
Re: Random thought for a solar kiln
« Reply #9 on: March 26, 2019, 08:22:25 AM »
could insulate with straw or even sand if you can keep it dry.  A reflector on the back side could warm the back.  If it could move with the sun could be efficient.  so the problem becomes making free stuff work may cost more and not work as well as just building a solar kiln with traditional frame construction.  It is fun to think about, and maybe the next new thing.  I eat bacon. digin_2
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Offline Crusarius

  • Senior Member x2
  • *****
  • Posts: 2813
  • Age: 42
  • Location: Canadice, New York
  • Gender: Male
  • Lost in....
    • Share Post
    • RockModified.com
Re: Random thought for a solar kiln
« Reply #10 on: March 26, 2019, 08:22:40 AM »
When all else fails I could launch pumpkins out of it in the fall :)

Offline Crusarius

  • Senior Member x2
  • *****
  • Posts: 2813
  • Age: 42
  • Location: Canadice, New York
  • Gender: Male
  • Lost in....
    • Share Post
    • RockModified.com
Re: Random thought for a solar kiln
« Reply #11 on: March 26, 2019, 08:24:03 AM »
I wonder if ii does not work how much vacuum I could put into a pipe like that and not have it collapse. Would not be hard to turn it into a vacuum kiln.

Offline WDH

  • Forester
  • Administrator
  • *****
  • Posts: 29296
  • Age: 65
  • Location: Perry, GA
  • Gender: Male
  • April 1998 - August 2008
    • Share Post
    • hamsleyhardwood.com
Re: Random thought for a solar kiln
« Reply #12 on: March 26, 2019, 08:25:22 AM »
When all else fails I could launch pumpkins out of it in the fall :)
Or one of your co-workers :D
Woodmizer LT40HDD35, John Deere 2155, Kubota M5640SU, Nyle L53 Dehumidification Kiln, and a passion for all things with leafs, twigs, and bark.  hamsleyhardwood.com

Offline doc henderson

  • Senior Member x2
  • *****
  • Posts: 2578
  • Age: 59
  • Location: Hutchinson, Ks
  • Gender: Male
  • Evil Prevails when Good Men Standby and Do Nothing
    • Share Post
Re: Random thought for a solar kiln
« Reply #13 on: March 26, 2019, 08:30:11 AM »
I am not sure if you have been watching too many, or have not watched enough old James Bond Movies.  The problem with vacuum is getting a pump big enough and sealing leaks in a container that can open and close.  vacuum effectively lowers the boiling point (evaporation) of liquids like water.  so a combo of heat and vacuum would be great.  and maybe a rotating disc on the back side could slice bread.   :D
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Online Don P

  • Senior Member x2
  • *****
  • Posts: 6049
  • Location: Southwestern VA
  • Gender: Male
    • Share Post
    • Calculator Index
Re: Random thought for a solar kiln
« Reply #14 on: March 26, 2019, 08:34:53 AM »
Vacuum and a decommissioned pipe, uh-huh :D
Flue wrapped... hmm this is sounding more like a charcoal retort, which will sterilize the wood.
A laborer works with his hands
A craftsman uses his brain and his hands
An artist uses his brain, his hands, and his heart

Offline doc henderson

  • Senior Member x2
  • *****
  • Posts: 2578
  • Age: 59
  • Location: Hutchinson, Ks
  • Gender: Male
  • Evil Prevails when Good Men Standby and Do Nothing
    • Share Post
Re: Random thought for a solar kiln
« Reply #15 on: March 26, 2019, 08:39:07 AM »
ok, so you need two diameters of pipe to create and inner and outer core (sounds like Austin powers baby) and insulate the gap between with saw dust.  stand it on end and have a rod attached to a round plate on the bottom and wood can be loaded in the top.  use a forced air outside wood furnace to heat the inside and can vent moisture form the circulating air.  when done use a skid steer to pull out the plate or a basket with the wood.  If this works you will have to find a smaller person to imitate your every move and laugh when ever you do.   smiley_sun 
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Offline Crusarius

  • Senior Member x2
  • *****
  • Posts: 2813
  • Age: 42
  • Location: Canadice, New York
  • Gender: Male
  • Lost in....
    • Share Post
    • RockModified.com
Re: Random thought for a solar kiln
« Reply #16 on: March 26, 2019, 08:45:47 AM »
doc, you crack me up :) I already have a mini me. bet I can get him to copy me. He is in that stage.

Don, it'll be fine. What could really go wrong? :)

By decommissioned pipe I was thinking one that got damaged from the excavator while being moved. not old rotten one.

And from what I understand you would only need 7" of vacuum to lower the boiling point to an effective level.


Offline doc henderson

  • Senior Member x2
  • *****
  • Posts: 2578
  • Age: 59
  • Location: Hutchinson, Ks
  • Gender: Male
  • Evil Prevails when Good Men Standby and Do Nothing
    • Share Post
Re: Random thought for a solar kiln
« Reply #17 on: March 26, 2019, 08:58:55 AM »
Hey Cru.  (like gru from despicable me)  any vacuum will lower the bp or increase evaporation.  Vacuum just like air pressure can result in violent catastrophic failure.  Also the strength and integrity of the spiral corrugated pipe would be decreased by any bend or deformation of the structure.  Now I just sucked the air out of the room.   :D  I assume you have an old ac refridge vacuum pump to try.  HF sell a vacuum pump that runs on compressed air.  Prob. not 100% duty cycle.  The trouble as eluded to is creating a door that will seal and not collapse under the vacuum if you can generate it.
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Offline Crusarius

  • Senior Member x2
  • *****
  • Posts: 2813
  • Age: 42
  • Location: Canadice, New York
  • Gender: Male
  • Lost in....
    • Share Post
    • RockModified.com
Re: Random thought for a solar kiln
« Reply #18 on: March 26, 2019, 09:18:39 AM »
never thought about an old refrigerator for a vacuum pump. Figured I would test the waters with the HF pump. Unless I could find a good price on a different one.

I am hoping with my fab and engineering skills I could make it stay round. 7" of vacuum is not that much. however the surface area it will be acting on is a concern. anywhere there are deformities in the pipe will definitely have to be addressed with additional support. It would be very easy to reinforce.

Offline Southside

  • Senior Member x2
  • *****
  • Posts: 5412
  • Age: 47
  • Location: Wilsons (Dinwiddie County), VA
  • Gender: Male
  • Have a plan to saw every log you meet.
    • Share Post
Re: Random thought for a solar kiln
« Reply #19 on: March 26, 2019, 09:43:45 AM »
I think by the time you did all of that you could cobble up a solar kiln and not worry about if it's going to work and just how well it works.

Not to mention eliminating the chance that you end up on a no-fly list along with a line of black SUV's following you everywhere as some satellite picked up a WMD / ICBM being built in your backyard.   :D
Franklin buncher and skidder
JD Processor
Woodmizer LT Super 70 and LT35 sawmill, KD250 kiln, BMS 250 sharpener and setter
Riehl Edger
Woodmaster 725 and 4000 planner and moulder
Enough cows to ensure there is no spare time.


Share via delicious Share via digg Share via facebook Share via linkedin Share via pinterest Share via reddit Share via stumble Share via tumblr Share via twitter

 


Powered by EzPortal