[RE-wrenches] solar hot water nighttime recirc

[Nicholas Ponzio]

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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