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cmashman
PostPosted: Mar 12th, '10, 23:39 
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DéjàVoodoo wrote:
Your kit came with the auto vent openers? Or was that an additional cost?

Thanks
Mark


Vent openers were extra $50 each

I got the 8 inch fan and variable speed controller this morning. Pond liner should come today. Found heavy duty totes at Home Depot for $10 each to use as grow beds. Pieces are coming together.
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cmashman
PostPosted: Mar 13th, '10, 00:35 
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countryboy wrote:
I'm pretty sure you want to air moving very slowly to give it time to phase change and condense heat into the soil. If the air moves too fast you lose that advantage and the underground system is for naught.

Also, I'm no expert here, but I think the auto vent would be counter productive to the STHC system. Sort of like holding the door open while the a/c is running. If the STHC can keep the daily temps below 85º or so, I'd leave the vents closed...

Just my 2¢.

CB


Good thoughts. My dad always said, "Were you born in a barn? Close the door!"

It's all still an experimental process. I've noticed the levers have balanced themselves out to open only about 2 inches @ 80F. I'll track the whole thing once I get it fully operational and let the empirical data draw it's own conclusion That's why I also got the speed adjuster with the new Grainger fan.

Half the fun is figuring it all out.
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Web4Deb
PostPosted: Mar 13th, '10, 03:14 
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cmashman wrote:
Thanks. I got a used Iwaki MD40 RLT that I will plumb to pump water around the backside.


Top-notch pump you have! I should know, I work for Iwaki America as the director of IT. :wink:
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countryboy
PostPosted: Mar 13th, '10, 05:06 
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cmashman wrote:
Half the fun is figuring it all out.


Ding, ding, ding!! That has a LOT to do with my addiction to AP and other sustainable technologies... My wife has the 'green thumb' and will likely manage most of the plants, etc once we are fully functional and I'll be adding to the system or off building something else...

CB
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cmashman
PostPosted: Mar 14th, '10, 12:49 
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Web4Deb wrote:
cmashman wrote:
Thanks. I got a used Iwaki MD40 RLT that I will plumb to pump water around the backside.


Top-notch pump you have! I should know, I work for Iwaki America as the director of IT. :wink:


Well, the guy must have sold me a bum pump. I started filling the tank with water and once it got about 6 inches above the bulkhead where the pump is attached, the pump started leaking water. None of the PVC fittings had a drop, but it was leaking from inside the pump. Capped it off, took off the pump and will have to open it up to see if there is a bad gasket somewhere.
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cmashman
PostPosted: Mar 14th, '10, 12:59 
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Here is a shot showing where the bulkhead is at the far end as the tank is filling
Image

Here is the pump. It was leaking right where the white plastic meets the blue metal.
Image

The STHC works! The new fan from Grainger was blowing 60F air out of the pipes despite it pulling air that was 79F from the Greenhouse. The air wasn't shooting out of the return plenum either. It appears as though the setup has a +1 so far.
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Web4Deb
PostPosted: Mar 14th, '10, 20:03 
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cmashman wrote:
Web4Deb wrote:
cmashman wrote:
Thanks. I got a used Iwaki MD40 RLT that I will plumb to pump water around the backside.


Top-notch pump you have! I should know, I work for Iwaki America as the director of IT. :wink:


Well, the guy must have sold me a bum pump. I started filling the tank with water and once it got about 6 inches above the bulkhead where the pump is attached, the pump started leaking water. None of the PVC fittings had a drop, but it was leaking from inside the pump. Capped it off, took off the pump and will have to open it up to see if there is a bad gasket somewhere.


PM the complete model number from the tag and I'll arrange to send a new o-ring to you.
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tamo42
PostPosted: Mar 15th, '10, 03:48 
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Could you explain more about the STHC concept? From what I gather it's a passive thermal flywheel kind of deal.
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cmashman
PostPosted: Mar 15th, '10, 21:19 
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tamo42 wrote:
Could you explain more about the STHC concept? From what I gather it's a passive thermal flywheel kind of deal.


Cliff Notes Version:
Air is blown into perforated tubes buried underground. Air comes into contact with the soil. Air that is warmer than the soil cools, air that is cooler than the soil warms. Over the course of a summer, the soil mass is loaded with heat deposited from the cooling of the air as the soil acts as a heat sink. During the colder months, the heat is returned to the greenhouse, and recouped if there are sunny days.

Full Version:
http://www.sunnyjohn.com/indexpages/shcs.htm
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Outbackozzie
PostPosted: Mar 15th, '10, 21:36 
Seriously, this cant be healthy.
Seriously, this cant be healthy.
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As per my buried growbeds and tank out here in Kal :)
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tamo42
PostPosted: Mar 17th, '10, 06:33 
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Gotcha, there is a similar application in passive heating and cooling houses by creating an insulated pocket of earth in a subbasement.
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cmashman
PostPosted: Mar 26th, '10, 21:42 
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Down the stretch it comes.

Got the electrical, plumbing and grow beds up. I just have to fill the beds with media. Rockwool cubes and seeds are on the way. 200 Tilapia fry will be coming around the middle of April.


Attachments:
File comment: Plenum buried and hook up to the thermostat. I only have it wired to the cooling setting. I'll just switch it over in late fall to heat
plenum 4.JPG
plenum 4.JPG [ 48.88 KiB | Viewed 2192 times ]
Electrical.JPG
Electrical.JPG [ 30.57 KiB | Viewed 2189 times ]
File comment: Grow beds are up.
Grow Bed 2.JPG
Grow Bed 2.JPG [ 65.91 KiB | Viewed 2196 times ]
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cmashman
PostPosted: Mar 26th, '10, 21:44 
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Another picture.


Attachments:
File comment: Close up showing bell syphon. Found I will have to add another 2x4 to support the middle of the totes.
Grow Bed.JPG
Grow Bed.JPG [ 45.51 KiB | Viewed 2198 times ]
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cmashman
PostPosted: May 14th, '10, 22:01 
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There is food. Things took off after I added 50 goldfish (all but two have perished) while I waited on the tilapia. I now have about 20-30 Tilapia fingerlings in there.


Attachments:
File comment: Basil. Just got the plants for $6 at Lowe's yesterday.
Basil.jpg
Basil.jpg [ 87.34 KiB | Viewed 2079 times ]
File comment: Lettuce. Has doubled in size in < 1 week.
Lettuce.jpg
Lettuce.jpg [ 77.58 KiB | Viewed 2082 times ]
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DecalsbyJT
PostPosted: May 14th, '10, 22:12 
In need of a life
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looking good.....

I recognize those tubs :) I have 10....

you may want to think about supporting the top sides as well... they will bow out on you

JT
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