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  • From: "Sandy Charles" <sandycharles AT comcast.net>
  • To: <market-farming AT lists.ibiblio.org>
  • Subject: Re: [Market-farming] Market-farming Digest, Vol 108, Issue 12
  • Date: Sun, 8 Jan 2012 18:07:02 -0700

Vern,
I'm in Fort Collins at latitude 40 and 5000' elevation. We have an inordinate amount of bright sunlight through the winter that I feel is key to the growth I experience. I'm on the plains just east of the foothills, so get very high winds. Not much else to speak of in the way of microclimate.

The most I pay in electricity to run my thermostats and fans is $15 month, and that's only for about 4 months. The high tunnel size is 20x40, with 280 sq ft planted.

I'm in the process of creating a blog that will have all of my year end reports with data, pictures, building process etc. I have wanted to share with this group but have been waiting till I had a couple of seasons under my belt to be sure it was consistently successful. I'll let you know when it's up.

Sandy

----- Original Message ----- From: <market-farming-request AT lists.ibiblio.org>
To: <market-farming AT lists.ibiblio.org>
Sent: Sunday, January 08, 2012 10:00 AM
Subject: Market-farming Digest, Vol 108, Issue 12


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Today's Topics:

1. subterranean heated high tunnel (Sandy Charles)
2. Re: subterranean heated high tunnel (Vern and Amy)


----------------------------------------------------------------------

Message: 1
Date: Sat, 7 Jan 2012 15:02:25 -0700
From: "Sandy Charles" <sandycharles AT comcast.net>
Subject: [Market-farming] subterranean heated high tunnel
To: <market-farming AT lists.ibiblio.org>
Message-ID: <76C0C86EF54247A98AF1227A1BC41765@DELL>
Content-Type: text/plain; charset="iso-8859-1"

Vern,

The high tunnel is heated by warmer air that is drawn from a duct near the high point and sent underground to lengths of perforated French drain pipe that run the length of the tunnel. The ground acts like a "heat sink", never freezing even in our subzero temps. The subsurface air that is displaced by the warmer air is then exhausted into the growing space. The key I'm finding is to plant the kind of vegetables that will take extremes of temperature in a day, and not really mind freezing every once in a while. The greens I have growing can be frozen solid in the morning and thaw when the sun warms the space - and they remain in perfect condition.

I'm happy to relay more information if you like. I've been doing a formal study for the local university so have all kinds of data... I got the design for this system from this website, which goes into all the detail you'd ever need. http://sunnyjohn.com/indexpages/shcs.htm

Sandy
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Message: 2
Date: Sun, 08 Jan 2012 06:55:11 -0800
From: Vern and Amy <vaspencer AT sisna.com>
Subject: Re: [Market-farming] subterranean heated high tunnel
To: market-farming AT lists.ibiblio.org
Message-ID: <4F09AE4F.6000409 AT sisna.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Sandy,
Very innovative idea. I will check out the site. I would be
interested in more information on your trials, as would probably others
here. Do you mind giving your location and any special microclimate
details, which may be relevant to someone evaluating whether this may
work for them? Thanks.

Vern


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End of Market-farming Digest, Vol 108, Issue 12
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