I was once told that the best collector used black chrome plated on bright nickel.
This combination absorbs heat well, with the advantage of not letting the heat back out.
Sort of a thermal "diode" of sorts.
I have no data, but I believe "good" collectors radiate less than they collect.
Mark
-------- Original Message --------
Subject: Re: [RE-wrenches] solar hot water nighttime recirc
From: "Carl Emerson" <freepo...@freepower.co.nz>
Date: Fri, December 18, 2009 10:04 pm
To: "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org>
Hi there gang,Just to say that IMHO solar thermal panels will radiate quite a bit less than they collect, someone must have some data on this ??Have a great Christmas.Carl EmersonFree Power Ltd.Web www.freepower.co.nz
From:re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Conrad Geyser
Sent: 18 December 2009 5:42 p.m.
To: npon...@buildingenergyus.com; 'RE-wrenches'
Subject: Re: [RE-wrenches] solar hot water nighttime recircNicholas,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.ConradCotuit 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 recircApologies 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.
__________ NOD32 4697 (20091217) Information __________
This message was checked by NOD32 antivirus system.
http://www.eset.com
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________ List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
