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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'>Add
one more benefit. The ETs ability to create a higher stored temperature in the
tank [ I start to divert to the heat dissipater @ 185</span><span
style='font-family:"Arial","sans-serif";color:windowtext'>° and it is in full
diversion at 195°] t, this allows me to install the next size smaller tank
[Super store , Crown Tri Tube etc], so it can save $ too.</span><span
style='font-family:"Arial","sans-serif";color:windowtext'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>Dana
Orzel<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>Great
Solar Works, Inc<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>www.solarwork.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>E
- dana@solarwork.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>V
- 970.626.5253<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>F
- 970.626.4140<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>C
- 970.209.4076<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN style='font-family:"Arial","sans-serif";color:#1F497D'>“I'd put my
money on solar energy… I hope we don't have to wait 'til oil and coal run out
before we tackle that.”<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN style='font-family:"Arial","sans-serif";color:#1F497D'>—Thomas Edison,
in conversation with Henry Ford and Harvey Firestone, March 1931</span><span
style='font-family:"Arial","sans-serif";color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'><o:p> </o:p></span></p>
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<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Kurt
Albershardt<br>
<b>Sent:</b> Wednesday, March 25, 2009 11:28 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Evacuated Tube-based SDHW<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'>On 3/25/09 7:40 AM, Peter Parrish
wrote: <o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'>could we start a thread?<o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'>My principal reason for looking
into this technology is for space-limited applications. Right now we are
looking at trying to find space on a crowded roof for about 100-120 sq-ft of
conventional flat plate collectors (e.g. SunEarth Empire 4’x8’ or 4’x10’), and
skylights, parapet walls and a PV array are getting in the way. Climate is
southern California coastal.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><br>
I asked for evacuated tube experiences on this list and have subsequently
queried a number of installers and manufacturers over the past 2-3 years.
There were some facts, a lot of bad experiences early on, and plenty of
opinions. What I have distilled from all of this so far is:<br>
<br>
ETs make sense when ∆T is high and when the location has a lot of overcast
days.<br>
ETs do not make sense when ∆T is low to moderate and when the location has few
overcast days.<br>
ETs cost more per square foot of aperture.<br>
ETs present much lower wind loads than flat plates (potentially allowing
installation using ballasted racking on low slope roofs.)<br>
Stagnation and scale present bigger risks with high fluid temps.<br>
<br>
<br>
<br>
<o:p></o:p></p>
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