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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Sounds like we could benefit from an updated DOE-2 window library based on Bruce’s observations.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">As to the meaning of “e3=.4”, per Table 7 in the DOE-2 help entry for “WINDOW Library”:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:windowtext">Low-E:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:windowtext">A low emissivity metallic coating is applied in order to increase thermal IR reflectance. The coated surface is indicated by en = v, where n = 1
is the outside of the outer pane, n = 2 is the inside of the outer pane, etc., and v is the emissivity (see, for example, G-T-C = 2635, where e2 = 0.1 indicates a coating with an emissivity of 0.1 on surface #2).
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">So, “e3=.4” describes an assembly with a low-e coating of emissivity 0.4 on the inside surface of the inner pane.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Syracuse Glass has a good list of considerations for low-e coatings and whether to have them on the #2 or #3 surface. Generally, coat the #3 surface if heat loss
is the primary consideration, and the #2 surface to limit solar heat gains.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="http://www.syracuseglass.com/E-DOCS/Insulating%20Glass/EDOCS/LOW-E%20Coating%20Orientation.pdf">http://www.syracuseglass.com/E-DOCS/Insulating%20Glass/EDOCS/LOW-E%20Coating%20Orientation.pdf</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif">William Bishop, PE, BEMP, BEAP, CEM, LEED AP
</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:#006600">|</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif"> Pathfinder Engineers & Architects LLP<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="line-height:105%"><b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif">Senior Energy Engineer<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif"><img border="0" width="56" height="38" id="Picture_x0020_4" src="cid:image002.jpg@01D32896.FC4F3090">
<img border="0" width="46" height="39" id="Picture_x0020_2" src="cid:image004.jpg@01D32896.FC4F3090"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">134 South Fitzhugh Street</span><span style="font-size:9.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D">
</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">Rochester, NY 14608<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><b><i><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#002060">T: (585) 698-1956</span></i></b><b><i><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#002060">
</span></i></b><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"> </span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">F: (585) 325-6005</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><a href="mailto:wbishop@pathfinder-ea.com"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif">bbishop@pathfinder-ea.com</span></a></span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif">
</span><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><a href="http://www.pathfinder-ea.com/"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif">www.pathfinder-ea.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-top:3.0pt;line-height:105%"><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><img border="0" width="34" height="32" id="Picture_x0020_5" src="cid:image006.png@01D32896.FC4F3090" alt="http://png-5.findicons.com/files/icons/977/rrze/720/globe.png"></span><span style="font-size:7.5pt;line-height:105%;font-family:"Calibri",sans-serif;color:#00B0F0">Carbon
Fee and Dividend - simple, effective, and market-based.</span><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Bruce Easterbrook via Equest-users<br>
<b>Sent:</b> Friday, September 08, 2017 11:19 AM<br>
<b>To:</b> Paul Diglio <paul.diglio@sbcglobal.net>; Equest-users <equest-users@lists.onebuilding.org><br>
<b>Subject:</b> Re: [Equest-users] Glass Library Question<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hi Paul,<br>
<a 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 href="https://windows.lbl.gov/software/window/6/W63_faq.html">
https://windows.lbl.gov/software/window/6/W63_faq.html</a> or <a 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<o:p></o:p></p>
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<p class="MsoNormal">On 9/8/2017 8:59 AM, Paul Diglio via Equest-users wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif">In the DOE-2 glass library I am looking at the double low-e (e3=.4) clear product, glass type code 2600.<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif">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.<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif">Thank you,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-family:"Helvetica",sans-serif">Paul Diglio<br>
87 Fairmont Avenue <br>
New Haven, CT 06513 <br>
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<pre>_______________________________________________<o:p></o:p></pre>
<pre>Equest-users mailing list<o:p></o:p></pre>
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