Joel,
We have done this with hot air into a gravel bed and Hydronic into concrete slab and into the grow bed. All were designed around the root zone concept. All work well and different installations for different existing conditions and also getting in before the green space was built and having a boiler for backup. The installations varied with the construction of the space: [2] were all plastic double wall and [1] was north, east, & west wall R-30 framed construction and south glazed. Elevations varied [2] were @ 5000+FT.EL and one at 9500FT.EL. different of collectors were used. Lots of variables and all have achieved the desired heating. I personally like the Flat plate-Hydronic with the boiler backup into the slab or gravel bed method best. If you want to discuss further, call tomorrow 8 - 5MST would be better. Dana Orzel Great Solar Works, Inc www.solarwork.com E - d...@solarwork.com V - 970.626.5253 F - 970.626.4140 C - 970.209.4076 I will be the shift in how the world uses power! - Dana Orzel From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Joel Davidson Sent: Tuesday, November 10, 2009 12:36 PM To: RE-wrenches Subject: [RE-wrenches] Solar for greenhouse root-zone heating Solar Thermal Wrenches, My client wants to solar heat the soil in his 30 x 96 commercial greenhouse. I found http://attra.ncat.org/attra-pub/PDF/ghrootzone.pdf but I do not know if solar for root-zone heating is practical. I can not find a solar equipment supplier. What do you think? Your solar thermal knowledge would be most appreciated. Thank you very much in advance. Joel Davidson
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