[RE-wrenches] solar hot water nighttime recirc

[Kirk Herander, VSE]

In terms of technique, the easiest way to accomplish this is to plumb a
valve in parallel with the systems' check valve, and have the customer open
it when nighttime diversion is necessary (middle of summer, customer on
vacation, no draw on system, etc). Unless the piping size or path limits it,
heat will dissipate through the collectors passively via reverse
thermosyphon, especially if using 1" or larger pipe.

 

Kirk Herander

Vermont Solar Engineering

802.863.1202

NABCEP(tm) Certified Solar Installer

NYSERDA-eligible Installer

VT Solar Incentive Program Partner

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at 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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