<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Try playing with night purge. I suspect the lower U-Value is penalising you by trapping heat at night that is then retained for the morning to become an AC load. If you look at peak loads and have simulated using a design day you should see an improvement in peak loads by lowering the U-Value. A thermally massive building would make the % change between glasses appear even less. <DIV>G<BR><DIV><DIV>On 24/07/2007, at 7:09 AM, Brandon Nichols wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Arial; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Courier New; font-size: 13px; text-align: -khtml-left; ">All,</SPAN></SPAN></FONT></DIV><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"></SPAN></FONT><SPAN class="Apple-style-span" style="text-align: -khtml-left; "> </SPAN></DIV><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Courier New; font-size: 13px; text-align: -khtml-left; ">I have a 3-story historic building, with circa-1920's windows on all four exposures. Big, beautiful, clear-glass single-pane architectural masterpieces. So while doing an optimization study, it became apparent to me that substantially changing the U-value and infiltration coefficients was having very little effect at all on the loads.</SPAN></SPAN></FONT></DIV><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"></SPAN></FONT><SPAN class="Apple-style-span" style="text-align: -khtml-left; "> </SPAN></DIV><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Courier New; font-size: 13px; text-align: -khtml-left; ">For example, varying the U-value from 1.27 to 0.55, 0.45 and at last 0.30 in the parametric runs using the 'simplified method' produced a 0.5% total (over all runs) change in the total energy consumption. Selecting representative glass types using the 'library method' produced essentially equivalent. Superimposing upon either of these a change in the infiltration coefficient from 1/4" to 1/8" to 1/16" to 1/32" produced no additional effect at all (the INF-METHOD = CRACK keyword is specified) on the annual energy consumption.</SPAN></SPAN></FONT></DIV><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"></SPAN></FONT><SPAN class="Apple-style-span" style="text-align: -khtml-left; "> </SPAN></DIV><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Courier New; font-size: 13px; text-align: -khtml-left; ">Lastly, I changed the baseline glass to "unglazed opening", again with a mystifying zero net effect on the overall energy consumption. It's as if the glass is not being calculated at all, but I see no errors or warnings in the SIM file.</SPAN></SPAN></FONT></DIV><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"></SPAN></FONT><SPAN class="Apple-style-span" style="text-align: -khtml-left; "> </SPAN></DIV><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Courier New; font-size: 13px; text-align: -khtml-left; ">Anyone have an idea on how to debug this?</SPAN></SPAN></FONT></DIV><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"></SPAN></FONT><SPAN class="Apple-style-span" style="text-align: -khtml-left; "> </SPAN></DIV><DIV dir="ltr" align="left"><FONT face="Courier New" color="#0000ff" size="2"><SPAN class="719335320-23072007"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Courier New; font-size: 13px; text-align: -khtml-left; ">Thanks in advance...</SPAN></SPAN></FONT></DIV><DIV><FONT face="Courier New" color="#0000ff" size="2"></FONT> </DIV><DIV align="left"><DIV align="left"><FONT face="Arial" size="2"></FONT><SPAN class="Apple-style-span" style="text-align: -khtml-left; "> </SPAN></DIV><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt; font-size: 13.3333px; text-align: -khtml-left; "><SPAN class="Apple-style-span" style="font-size: 13.3333px; text-align: -khtml-left; "></SPAN><DIV style="font-size: 13.3333px; text-align: -khtml-left; "><SPAN style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt; color: rgb(128, 128, 128); font-size: 13.3333px; text-align: -khtml-left; "><SPAN class="212011020-11052004"><FONT color="#000000"><SPAN class="Apple-style-span" style="font-size: 13.3333px; text-align: -khtml-left; ">Brandon Nichols, PE</SPAN></FONT></SPAN></SPAN></DIV><DIV style="font-size: 13.3333px; 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