<font color="#336666"><font face="verdana,sans-serif">Just admit it- eQuest is flawed, you don't have to make up things to protect it- </font></font><div><div><font color="#336666"><font face="verdana,sans-serif"><br></font></font></div>
<div><font color="#336666" face="verdana, sans-serif">If it is a mistake to use the percent points rather then percent reduced from the abrataty eQuest assumption from 1999 window specs than the it should have reduced solar heat gain by more then his product even provided- Using the 33 percentage points but used the 33% should have provided him over stated cooling reduction, (and extra added heating consumption tradeoff) </font></div>
<div><font color="#336666" face="verdana, sans-serif"><br></font></div><div><span style="color:rgb(51,102,102);font-family:verdana,sans-serif">O- and FYI </span>LBL<span style="color:rgb(51,102,102);font-family:verdana,sans-serif"> window does glass U-value not shading, ware-as </span>LBL<font color="#336666" face="verdana, sans-serif"> optics can be used for film coefficients and used to create a custom glass type in window, but do not do any calculations for "shading"</font></div>
<div><span style="color:rgb(51,102,102);font-family:verdana,sans-serif"><br></span></div><div><font color="#336666" face="verdana, sans-serif">I say you try the same model in Energy Plus or TRNSYS and see if the results differ.</font></div>
<div><span style="color:rgb(51,102,102);font-family:verdana,sans-serif"><br></span></div><div><font color="#336666"><font face="verdana,sans-serif"><br clear="all"></font></font><div style="text-align:left"><font face="verdana, sans-serif" color="#999999"><i>Jeremiah D. Crossett</i></font></div>
<div style="text-align:left"><font face="verdana, sans-serif" color="#999999"><i>CleanTech Analytics</i></font></div><div style="text-align:left"><font face="verdana, sans-serif" color="#999999"><i><a href="tel:503-688-8951" value="+15036888951" target="_blank">503-688-8951</a></i></font></div>
<div><div style="text-align:left"><a href="http://www.cleantechanalytics.com" target="_blank"><font face="verdana, sans-serif" color="#999999"><i>www.cleantechanalytics.com</i></font></a></div><div><div style="text-align:center">
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<br><br><div class="gmail_quote">On Sat, Jul 14, 2012 at 12:42 PM, Liam O'Brien <span dir="ltr"><<a href="mailto:obrien_liam@hotmail.com" target="_blank">obrien_liam@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Hi Pete,<div><br></div><div>I don't have a ton of experience with detailed modelling of shades in eQUEST, specifically, but two things that could be at play:</div><div><br></div><div>- The claim from the manufacturer sounds like it's not intended to universal in absolute terms. Also, it would be more conservative to reduce the SHGC by 3<span style="font-size:10pt">3 percent than 33</span><span style="font-size:10pt"> </span><u style="font-size:10pt">percentage points</u><span style="font-size:10pt"> (as you did)</span><span style="font-size:10pt"> if you're going to take this simplified approach. Therefore, it would be closer to SHGC=0.44. Subtle but significant. You could try using software that specializes in window/shade performance like LBNL Window or Parasol to try to characterize the performance of your specific shade-glazing combination</span></div>
<div>- Depending on the operating conditions and construction of the building, there's a chance your results aren't ridiculous. If shades intercept transmitted solar radiation, then a lot of that energy will almost immediately transfer to the air via convection. If you have thermally massive interior surfaces, there's a chance your building could actually perform better without those shades because the air conditioning won't kick in till later. </div>
<div><br></div><div>Liam</div><div><br><div><div></div><hr>Date: Sat, 14 Jul 2012 11:51:02 -0700<br>From: <a href="mailto:pbaumstark@sbcglobal.net" target="_blank">pbaumstark@sbcglobal.net</a><br>To: <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
Subject: [Equest-users] Unexpected Custom SHGC Results<div><div><br><br><div style="font-family:arial,helvetica,sans-serif;font-size:12pt"><div>Hello,<br><br>I have an "L" shaped building with the point of the "L" facing North. The inside of the "L" has both NE and NW surfaces, that include a high amount of glass, which heats up the perimeter building spaces considerably during the summer. Glazing is single pane tinted.<br>
<br>The customer wants to install some Verisol SilverScreen shades in these windows. According to the manufacturer, the SHGC will reduce by about 33%. I modeled in eQUEST, window properties in these windows to have an SHGC of 0.67 and ran an EEM reducing SHGC to 0.34, and got an increase in cooling load and fan load year round, even in the summer months.<br>
<br>Am I seeing this wrong? I can't figure out how I could possible get results like this?<br><br>Thank you,<br>Pete<br>San Jose, CA<br></div>
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