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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>We use chrome oxide collectors
exclusively. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>What I’m getting at is that the
system will satisfactorily self regulate. Just from all the combined
parasitic losses, a typical flat plate system will top out around 180F max.tank
temp. in an average summer climate even without nighttime heat dumping. Night
time heat dumping is nice way to bring that number down more in a case of limited
occupancy / overproduction. Here in the Northeast, more often than not,
residences have basement dehumidifiers running all summer. If that is the
case and there isn’t significant AC being used, we tend to use a basement
heat loop for the excess heat. Again, no numbers, but any thermal load that
can help against a giant electrical dehumidification one is a gain.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>An evacuated tube system needs more sophisticated
top heat regulation. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Conrad<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:PersonName w:st="on"><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Cotuit
Solar</span></font></st1:PersonName><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>mark@hurshtown.com<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, December 18, 2009
10:26 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">RE-wrenches</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [<st1:PersonName
w:st="on">RE-wrenches</st1:PersonName>] solar hot water nighttime recirc</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=black face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:black'>I was once told that
the best collector used black chrome plated on bright nickel. <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:black'>This combination
absorbs heat well, with the advantage of not letting the heat back out. <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:black'>Sort of a thermal
"diode" of sorts.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:black'>I have no data, but I
believe "good" collectors radiate less than they collect.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:black'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:black'>Mark<o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 6.0pt;
margin-left:6.0pt;margin-top:5.0pt;margin-bottom:5.0pt' id=replyBlockquote
webmail=1>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 color=black
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:black'>--------
Original Message --------<br>
Subject: Re: [<st1:PersonName w:st="on">RE-wrenches</st1:PersonName>] solar hot
water nighttime recirc<br>
From: "Carl Emerson" <freepower@freepower.co.nz><br>
Date: Fri, December 18, 2009 10:04 pm<br>
To: "'<st1:PersonName w:st="on">RE-wrenches</st1:PersonName>'"
<re-wrenches@lists.re-wrenches.org><o:p></o:p></span></font></p>
<div>
<div>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'>Hi there gang,</span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'> </span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'>Just to say that IMHO solar thermal panels
will radiate quite a bit less than they collect, someone must have some data on
this ??</span></font><font size=2 color=black face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'> </span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'>Have a great Christmas.</span></font><font
size=2 color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'> </span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<div>
<p class=MsoNormal><font size=3 color=blue face=Arial><span lang=EN-NZ
style='font-size:12.0pt;font-family:Arial;color:blue'>Carl Emerson</span></font><font
size=2 color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=blue face=Arial><span lang=EN-NZ
style='font-size:12.0pt;font-family:Arial;color:blue'>Free Power Ltd.</span></font><font
size=2 color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=blue face=Arial><span lang=EN-NZ
style='font-size:12.0pt;font-family:Arial;color:blue'>Web www.freepower.co.nz</span></font><font
size=2 color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
</div>
<div>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'> </span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<div>
<p class=MsoNormal><b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black;font-weight:bold'>From:</span></font></b><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:black'>re-wrenches-bounces@lists.re-wrenches.org [<a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank"><u><font
color=blue><span style='color:blue'>mailto:re-wrenches-bounces@lists.re-wrenches.org</span></font></u></a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Conrad Geyser<br>
<b><span style='font-weight:bold'>Sent:</span></b> 18 December 2009 5:42
p.m.<br>
<b><span style='font-weight:bold'>To:</span></b> nponzio@buildingenergyus.com;
'<st1:PersonName w:st="on">RE-wrenches</st1:PersonName>'<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [<st1:PersonName
w:st="on">RE-wrenches</st1:PersonName>] solar hot water nighttime recirc</span></font><font
size=2 color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'> </span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Nicholas,</span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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.</span></font><font size=2 color=black
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Conrad</span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><st1:PersonName w:st="on"><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Cotuit
Solar</span></font></st1:PersonName><font size=2 color=black face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
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color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<div>
<p class=MsoNormal><b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black;font-weight:bold'>From:</span></font></b><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:black'>re-wrenches-bounces@lists.re-wrenches.org [<a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank"><u><font
color=blue><span style='color:blue'>mailto:re-wrenches-bounces@lists.re-wrenches.org</span></font></u></a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Nicholas Ponzio<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, December 16,
2009 10:54 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">RE-wrenches</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [<st1:PersonName
w:st="on">RE-wrenches</st1:PersonName>] solar hot water nighttime recirc</span></font><font
size=2 color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'> </span></font><font size=2
color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Apologies if this has already been
discussed here.<br>
<br>
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?<br>
<br>
Thanks for any feedback.</span></font><font size=2 color=black face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:black'><o:p></o:p></span></font></p>
</div>
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style='font-size:12.0pt;color:black'><br>
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