<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I would support everything a number of replies have indicated, including Timothy's. <div><br></div><div>We recently had a need to validate the effectiveness of shading in EnergyPlus versus IES VE. Once input assumptions were aligned, the output was very similar for clear sunny days which is what you would expect given they have both been BESTEST'd. We did observe differences under highly diffuse conditions or where shortwave gains were dominated by ground reflectance or sky model differences. Think of a north facade in summer at 30 Degrees latitude with a horizontal shade fully shading from beam radiation. In these cases there were differences which at those points in time appeared significant, but the differences were small in the context of the shading that was occurring on the beam component or on the annual solar gains. If you looked at annual cooling numbers the differences observed under diffuse or ground reflected conditions were noise compared to differences that may arise in the simulation due to other factors ...<div><br><div><div><div>Regards</div><div>Graham</div><div><br><div><div>On 27/11/2012, at 6:27 AM, Timothy Moore wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Arial; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-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; "><div lang="EN-US" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">David,<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">I would caution you not to be so quick to use the term “underestimate,” which implies that you are certain that your test is set up correctly and that know the EnergyPlus calcs to be accurate. Furthermore, given the magnitude of the disparity you’ve described—which does not show up either in the published ASHRAE 140 tests comparing results for the VE and EnergyPlus or in the SimBuild paper from Cassie Waddell and Shruti Kaserekar that Javed Iqbal attached to his reply—there may be something significantly amiss in your comparison.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">You need to ensure that you are consistent with your glazing properties and you may want to be running the “detailed solar calculations” in EnergyPlus and, likewise, linking the simulation to results from the SunCast module within the VE if you want a suitably consistent basis for the comparison. This will facilitate calculation of incident solar radiation on specific surfaces, etc.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">While I’m not sure how this works in EnergyPlus, when you run simulations coupled to the SunCast module in the VE, you need to be cognizant of the relative placement of glazing in your “test cell,” as low-angle direct-beam radiation striking an east window in the early morning, for example, can pass<span class="Apple-converted-space"> </span><i>through</i><span class="Apple-converted-space"> </span>the space and<span class="Apple-converted-space"> </span><i>out</i><span class="Apple-converted-space"> </span>the other side, in keeping with the location and solar transmission of glazing on the façades through which the solar gain is entering and exiting.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">On a related note, whereas the paper from Waddell and Kaserekar attributes the calculation of interior inter-surface radiant exchanges to the SunCast module of the VE, this is actually a function of the ApacheSim engine used for all dynamic thermal simulations in the VE. SunCast determines which surface the solar gain will fall upon and what fraction of each surface is shaded from direct-beam radiation at any given time step, as well as how much of those surfaces are shaded from the cooling effects of the night sky; however, regardless of SunCast, the hot interior surface of a piece of glass having absorbed solar gain, for example, will always exchange radiant energy with any interior surfaces of lower temperature during the simulation run. Conversely, the cold interior surface of a window or exterior wall in winter will always act as a sink for radiant energy from warmer interior surfaces.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Finally, if you’re interested in digging deeper into the comparison, I was told by researchers at the Technical University at Eindhoven in The Netherlands attending the last SimBuild conference that their current findings (yet to be published) show that the solar calculations in the VE are actually somewhat more accurate than those in other tools, including EnergyPlus and ESPr, particularly when passing through multiple glazed surfaces, cavities, or thermal zones. As it’s not yet published and IES was not involved in this research, I’ll leave it to TU Eindhoven to elaborate on what they tested, what they found, and whether or not they believe this to be of any significance. They may be willing to share some results in advance of publication.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Regards,<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Timothy<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" align="left" width="442" style="width: 331.5pt; border-collapse: collapse; margin-bottom: 7.75pt; "><tbody><tr style="page-break-inside: avoid; "><td width="66" valign="top" style="width: 49.5pt; padding-top: 0.7pt; padding-right: 0.7pt; padding-bottom: 0.7pt; padding-left: 0.7pt; "><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; line-height: 18px; "><a href="http://www.iesve.com/" style="color: blue; text-decoration: underline; "><b><span style="font-family: Calibri, sans-serif; color: rgb(54, 95, 145); text-decoration: none; "><span><image003.jpg></span></span></b></a><b><span style="font-family: Calibri, sans-serif; color: rgb(54, 95, 145); "><o:p></o:p></span></b></div></td><td width="218" valign="top" style="width: 163.15pt; padding-top: 0in; padding-right: 0.7pt; padding-bottom: 0.7pt; padding-left: 0.7pt; "><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; line-height: 13pt; "><b><span style="font-size: 14pt; font-family: Calibri, sans-serif; color: rgb(54, 95, 145); ">Timothy Moore</span></b><b><span style="font-size: 13pt; font-family: Calibri, sans-serif; color: rgb(54, 95, 145); "><span class="Apple-converted-space"> </span></span></b><b><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(54, 95, 145); "><br></span></b><span style="font-size: 11pt; font-family: Calibri, sans-serif; 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"><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div><div><div><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 12pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></p><div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">On Fri, Nov 23, 2012 at 5:23 AM, David GARCIA-SANCHEZ <<a href="mailto:dgarciasanchez@greenaffair.com" target="_blank" style="color: blue; text-decoration: underline; ">dgarciasanchez@greenaffair.com</a>> wrote:<o:p></o:p></div></div></div><blockquote style="border-top-style: none; border-right-style: none; border-bottom-style: none; border-width: initial; border-color: initial; border-left-style: solid; border-left-color: rgb(204, 204, 204); border-left-width: 1pt; padding-top: 0in; padding-right: 0in; padding-bottom: 0in; padding-left: 6pt; margin-left: 4.8pt; margin-right: 0in; "><div><div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="FR" style="font-family: Arial, sans-serif; ">Dear group, </span><span lang="FR"><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="FR" style="font-family: Arial, sans-serif; "> </span><span lang="FR"><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-family: Arial, sans-serif; ">In our current projects we noticed a big difference when modeling solar gains between the software IES VE and Designbuilder (EnergyPlus). IES VE underestimate the values of solar gains, by almost 1 to 2 of difference than EnergyPlus,</span><span lang="FR"><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-family: Arial, sans-serif; "> </span><span lang="FR"><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-family: Arial, sans-serif; ">So I just try to ask if someone of you are experienced the same difference and if you know the reasons of that big difference. We test a “cell-test” and we found also this underestimation of solar gains.</span><span lang="FR"><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-family: Arial, sans-serif; "> </span><span lang="FR"><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-family: Arial, sans-serif; ">Thanks in advance,</span><span lang="FR"><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-family: Arial, sans-serif; "> </span><span lang="FR"><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-family: Arial, sans-serif; ">David Garcia Sanchez</span><span lang="FR"><o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-family: Arial, sans-serif; "> </span><span lang="FR"><o:p></o:p></span></div><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse; "><tbody><tr style="min-height: 39.55pt; "><td width="106" style="width: 79.8pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; min-height: 39.55pt; "><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p></o:p></div></td><td width="394" style="width: 295.85pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; min-height: 39.55pt; "><div style="margin-top: 0in; margin-right: 0in; 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font-size: 12pt; font-family: 'Times New Roman', serif; line-height: 17px; "><b><span style="font-size: 8pt; line-height: 12px; font-family: Arial, sans-serif; color: rgb(140, 198, 62); "><a href="http://www.greenaffair.com/" target="_blank" style="color: blue; text-decoration: underline; "><span style="color: rgb(140, 198, 62); ">www.greenaffair.com</span></a></span><span style="color: rgb(146, 208, 80); "></span></b><o:p></o:p></div></td></tr></tbody></table><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="FR"> <o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="FR"> <o:p></o:p></span></div></div></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div></div><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 12pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">_______________________________________________<br>Bldg-sim mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank" style="color: blue; text-decoration: underline; ">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to<span class="Apple-converted-space"> </span><a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG" target="_blank" style="color: blue; text-decoration: underline; ">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p></blockquote></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="color: rgb(136, 136, 136); "><br><br clear="all"><span class="hoenzb"><o:p></o:p></span></span></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span class="hoenzb"><span style="color: rgb(136, 136, 136); ">--</span><o:p></o:p></span></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><i><span style="font-family: 'Courier New'; color: rgb(0, 0, 153); "><o:p> </o:p></span></i></div></div><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 12pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span class="hoenzb"><span style="font-family: Tahoma, sans-serif; color: rgb(51, 51, 153); ">Javed Iqbal, LEED AP, CEA</span></span><span style="font-family: Tahoma, sans-serif; color: rgb(51, 51, 153); "><br><span class="hoenzb">Energy Analyst</span><br><br></span><o:p></o:p></p></div><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 12pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><br>_______________________________________________<br>Bldg-sim mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank" style="color: blue; text-decoration: underline; ">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to<span class="Apple-converted-space"> </span><a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG" style="color: blue; text-decoration: underline; ">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div></div>_______________________________________________<br>Bldg-sim mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" style="color: blue; 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