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Subject: Market Farming
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- From: "Sandy Charles" <sandycharles AT comcast.net>
- To: <market-farming AT lists.ibiblio.org>
- Subject: [Market-farming] subterranean heated high tunnel
- Date: Sat, 7 Jan 2012 15:02:25 -0700
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
|
-
[Market-farming] subterranean heated high tunnel,
Sandy Charles, 01/07/2012
-
Re: [Market-farming] subterranean heated high tunnel,
Vern and Amy, 01/08/2012
- Re: [Market-farming] subterranean heated high tunnel, John Ehrlich, 01/08/2012
-
Re: [Market-farming] subterranean heated high tunnel,
Vern and Amy, 01/08/2012
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