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Author Topic: Random thought for a solar kiln  (Read 880 times)

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Offline Crusarius

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Re: Random thought for a solar kiln
« Reply #20 on: March 26, 2019, 09:48:51 AM »
southside your probably right. But I did get a good laugh out of that :) I will paint it like a p-51 mustang with the teeth on the front :)

Of course we go back to the primary goal. Sanitized lumber, so I do not have bugs when I sell it. But side product being able to use it to also dry lumber.

Offline GeneWengert-WoodDoc

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Re: Random thought for a solar kiln
« Reply #21 on: March 26, 2019, 01:04:58 PM »
I think part of the issue here is trying to make a kiln and a solar collector out of the same material at the same time. Try making each unit separately.  

It is easy to build an insulated, vapor-proof box for the kiln.  Include vents, fans, etc.  maybe include a control system.  Make sure that the insulation and all other material can withstand 160 F or so.

Then, take a pipe, or other shape or materials, and make the solar collector...black absorber with two layers of clear material to trap the heat with insulated back side...and then duct the heat into a kiln.  

Once this is done, you could consider putting the two units together as I did with the VT kiln...the south-facing roof of the kiln is the collector.
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Offline Crusarius

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Re: Random thought for a solar kiln
« Reply #22 on: March 26, 2019, 01:36:19 PM »
That is definitely a good idea. Wonder how efficient I could make it. Living in upstate NY I have a hard time believing I will be able to get 150f for 24 hours in a solar kiln.

Offline doc henderson

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Re: Random thought for a solar kiln
« Reply #23 on: March 26, 2019, 08:51:26 PM »
You cannot do high heat for 24 hours in a solar kiln, i guess alaska in the summer?  but you can dry it in the kiln.  As it dries, the wood can increase temp more easily.  The heat treat is usually at the end of drying.  after it is dry, you're only heating wood mostly, when wet, you also have to heat the water.  i think the goal is to get the wood up to 136° by having the kiln at 150/160.  so thinner wood may not take 24 hours.  nice thread, I think we all had fun and discussed some theoretical ideas.  Thanks Gents.

Offline GeneWengert-WoodDoc

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Re: Random thought for a solar kiln
« Reply #24 on: March 26, 2019, 09:59:26 PM »
When you combine collector and kiln, you will lose heat at night and reach 100% RH which will relieve stress or casehardening.  The kiln cools because the collector loses a lot of heat at night.  You could  get 150 F at night if you used a small auxiliary heater and covered the collector with insulation.

When you have two separate units...kiln and same size collector...you can get a little hotter as heat losses can be lower, overall, but fail to get 100% RH at night to relieve stress.  Plus the separate units cost more.  With a separate  collector, you can easily make the collector larger than the roof size of the kiln...10 BF per sq. Ft. of collector.
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Offline tacks Y

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Re: Random thought for a solar kiln
« Reply #25 on: March 27, 2019, 03:45:27 AM »
This talk of vacuum? There is a you tube with a tanker unloading that forgot to open a hatch. Did not last long.

Offline Crusarius

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Re: Random thought for a solar kiln
« Reply #26 on: March 27, 2019, 07:43:54 AM »
That be pretty kool to see.

Well I do think we have all learned a little about my crazy random thought. Be nice to actually try it out and see how it works. What really sux is I have all sorts of data acquisition stuff here at work. all stuff that would work great for monitoring and learning but I can;t take it home :(

And in order to buy all of it I am looking at about 30k. So maybe now is a good time to learn arduino or raspberry pi. And start setting stuff up and doing real data acquisition. I like testing.


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