Nicholas,
You can certainly do that. Most newer controllers have a "vacation" function that will provide this. Another method is to put in a bypass to the check valve that you can open and the system will naturally reverse thermo siphon at night. Not much in the way of calculations other than the collectors reradiate as effectively as they collect. Conrad Cotuit Solar _____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Nicholas Ponzio Sent: Wednesday, December 16, 2009 10:54 PM To: RE-wrenches Subject: [RE-wrenches] solar hot water nighttime recirc Apologies if this has already been discussed here. One heat diversion method I hear suggested often is recirculating through the collectors (flatplate) at night. Are there any data, calculations or anecdotal evidence on the effectiveness of this approach? That is, can I really radiate as much energy back to a dark sky as I collect during the day? Thanks for any feedback.
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