<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">How does the film affect the U-value and the SHGC for the window? It sounds like the film is reducing the solar heat gain coefficient, and increasing the heating load. You should also keep in mind that outdoor air loads can dominate the heating load in winter and that envelope effects can be minimal depending on the climate and type of building. You may want to look into the loads reports in the SIM file to see what effects the film has on the building cooling and heating loads.<div><br></div><div>Cheers,</div><div>Dan</div><div><div><br><div><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Verdana; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; ">—<br>Daniel Knapp, PhD, LEED® AP O+M<br><a href="mailto:danielk@arborus.ca">danielk@arborus.ca</a><br><br>Arborus Consulting<br>Energy Strategies for the Built Environment<br>www.arborus.ca<br>76 Chamberlain Avenue <br>Ottawa, ON, K1S 1V9 <br>Phone: (613) 234-7178 ext. 113<br>Fax: (613) 234-0740<br><span></span><br><br></span>
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<br><div><div>On 2011-05-27, at 10:42 AM, Raphael, Dan wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Verdana; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-US" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">Has anybody successfully modeled window film installation using eQuest? Specifically, I am trying to model the Vista EnerLogic low-e film (since it is eligible for tax incentives). I’ve used Optics5/Window5 to construct the glass type using the EnerLogic applied film (NFRC ID# 2545) and imported that into eQuest. When I test this retrofit in a sample building, the savings are not what I expect (~65 yr. payback, assuming $7 installed cost). I would expect to see a payback somewhere around 10-15 years. What bothers me is that in the model, the heating load increases, which would be expected for a typical window film, but this film claims to have savings in all seasons due to the ability to trap heat in the building. If anybody has had any success in modeling these window films and could provide me with step-by-step instructions or any guidance, it’d be greatly appreciated.<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">Thanks!<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><b><span style="font-size: 10pt; font-family: 'Book Antiqua', serif; ">Dan Raphael</span></b><span style="font-size: 10pt; font-family: 'Times New Roman', serif; "><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 10pt; font-family: 'Berlin Sans FB', sans-serif; ">Building Performance Analyst</span><span style="font-size: 10pt; font-family: 'Times New Roman', serif; "><o:p></o:p></span></div><p class="MsoNormal" style="margin-top: 3pt; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><b><span style="font-size: 10pt; font-family: 'Book Antiqua', serif; ">Integrated<span class="Apple-converted-space"> </span><span style="color: red; ">Design Solutions<o:p></o:p></span></span></b></p><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-bottom: 3pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 9pt; font-family: 'Berlin Sans FB', sans-serif; ">Architecture, Engineering, Interiors & Technology<b><span style="color: red; "><o:p></o:p></span></b></span></p><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 10pt; font-family: 'Berlin Sans FB', sans-serif; ">1441 W. Long Lake, Suite 200</span><span style="font-size: 10pt; font-family: 'Times New Roman', serif; "><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 10pt; font-family: 'Berlin Sans FB', sans-serif; ">Troy, Michigan 48098<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 10pt; font-family: 'Berlin Sans FB', sans-serif; ">tel: 248.823.2171</span><span style="font-size: 10pt; font-family: 'Times New Roman', serif; "><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 10pt; font-family: 'Berlin Sans FB', sans-serif; ">fax: 248.823.2200<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 10pt; font-family: Arial, sans-serif; "><a href="http://www.ids-troy.com/" style="color: blue; text-decoration: underline; "><span style="font-family: 'Berlin Sans FB', sans-serif; color: blue; ">www.ids-troy.com</span></a><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 10pt; font-family: 'Century Gothic', sans-serif; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><a href="http://www.energystar.gov/" style="color: blue; text-decoration: underline; "><span style="color: windowtext; text-decoration: none; "><span><image001.png></span></span></a><o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div></div>_______________________________________________<br>Equest-users mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" style="color: blue; text-decoration: underline; ">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to<span class="Apple-converted-space"> </span><a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG" style="color: blue; text-decoration: underline; ">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><br></div></span></blockquote></div><br></div></div></div></body></html>