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Hi Paul,<br>
<a class="moz-txt-link-freetext" href="http://doe2.com/download/DOE-22/DOE22Vol4-Libraries_47.pdf">http://doe2.com/download/DOE-22/DOE22Vol4-Libraries_47.pdf</a>, go
further down to page 27 or page 33 on the pdf numbering. The last
paragraph explains that the coatings on the different glass surfaces
have complicated the library. I assume the e?.? is the new attempt
to keep track of the different coatings and also which glass surface
they are on.<br>
You are in the emissivity table. The table above is the reflective
glazing and below is electrochromic glazing. With a thermopane
there are 4 glass surfaces and the new windows can have all 3 of
these types of coatings and more in a single unit.<br>
I suspect you can find the actual meanings here:
<a class="moz-txt-link-freetext" href="https://windows.lbl.gov/software/window/6/W63_faq.html">https://windows.lbl.gov/software/window/6/W63_faq.html</a> or
<a class="moz-txt-link-freetext" href="https://windows.lbl.gov/">https://windows.lbl.gov/</a><br>
Glass has got very complex in the last few years and those charts
represent products sold in mid 2006. Our new code asks for much
better performance than these glass types are capable of. The best
of these represented a window ER of 18 to 20. Our code wanted 25.
Some of the new windows are getting up to an ER of 30 for a
thermopane. That huge bump is almost all due to coatings and their
arrangement.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
<br>
<div class="moz-cite-prefix">On 9/8/2017 8:59 AM, Paul Diglio via
Equest-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20170908125919.JHPV7399.toroondcmxzimta03-srv.bellnexxia.net@tordcvbicmrk01">
<div style="color:#000; background-color:#fff;
font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande,
sans-serif;font-size:16px">
<div id="yui_3_16_0_ym19_1_1504832178680_12139" dir="ltr"><span
id="yui_3_16_0_ym19_1_1504832178680_13326">In the DOE-2
glass library I am looking at the double low-e (e3=.4) clear
product, glass type code 2600.</span></div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1504832178680_13415"><span
id="yui_3_16_0_ym19_1_1504832178680_13326"><br>
</span></div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1504832178680_13414"><span
id="yui_3_16_0_ym19_1_1504832178680_13326">Does anyone know
what the e3=.4 means? There are other products, such as
type 2630 with e2=.1 with a much different assembly u-value.</span></div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1504832178680_13489"><span
id="yui_3_16_0_ym19_1_1504832178680_13326"><br>
</span></div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1504832178680_13488"><span
id="yui_3_16_0_ym19_1_1504832178680_13326">Thank you,</span></div>
<div id="yui_3_16_0_ym19_1_1504832178680_13405"> </div>
<div class="signature"
id="yui_3_16_0_ym19_1_1504832178680_13359">Paul Diglio<br>
87 Fairmont Avenue <br>
New Haven, CT 06513 <br>
<br>
<br>
</div>
</div>
<br>
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<br>
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