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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Katherine,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The questions I would have for you (or your client) are:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo5'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>Is this an existing building, or something in the design phase?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo5'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>What is the model going to be used for?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo5'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>Is there something magical about the 1% number?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo5'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>1% of what? Annual electrical consumption? Annual gas consumption? Both? Monthly electric/gas consumption? Monthly/annual electrical demand?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo5'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>Why remove the plug loads? Even if everything else is modeled perfectly, plug loads are typically 10% or more of annual electrical consumption but can be all over the place.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo5'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>“Easily adjusted” by whom? Does your client want you to hand them a model and let them make all subsequent adjustments?<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Even if you are an expert energy modeler, and there is monitored energy data available for the building down to the individual electrical panels or broken out by end use (lighting, plug loads, individual HVAC units etc.) you will be hard-pressed to get to within 1% on a month-by-month basis. Even 5% month-by-month is difficult. Sure, you can tweak to your heart’s content to get a model to match annual electric consumption within 1% based on prior year’s utility bills but to maintain a calibrated model to that tolerance after that would require a lot of work.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I suggest searching the bldg-sim and equest-users archives for information about weather files.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Oh, one more question – how much money does your client have?<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Bill<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'>William Bishop, PE, BEMP, LEED<sup>®</sup> AP </span></b><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:#006600'>|</span></b><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'> </span></b><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'>Pathfinder Engineers & Architects LLP</span></b><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>Mechanical Engineer<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:5.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f">
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</v:shapetype><v:shape id="Picture_x0020_7" o:spid="_x0000_s1026" type="#_x0000_t75" alt="Top 100 Rochester 2010" style='position:absolute;margin-left:275.35pt;margin-top:12.75pt;width:45.2pt;height:43.55pt;z-index:-1;visibility:visible;mso-wrap-style:square;mso-wrap-distance-left:9pt;mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;mso-wrap-distance-bottom:0;mso-position-horizontal:absolute;mso-position-horizontal-relative:text;mso-position-vertical:absolute;mso-position-vertical-relative:text'>
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</v:shape><![endif]--><![if !vml]><span style='mso-ignore:vglayout;position:absolute;z-index:-1;margin-left:367px;margin-top:17px;width:60px;height:58px'><img width=60 height=58 src="cid:image001.jpg@01CC05B3.564DDCD0" alt="Top 100 Rochester 2010" v:shapes="Picture_x0020_7"></span><![endif]><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>134 South Fitzhugh Street</span><span style='font-size:9.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Rochester, NY 14608</span><span style='font-size:9.0pt;font-family:"Times New Roman","serif";color:#1F497D'><br></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>T: (585) 325-6004 </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>Ext. 114</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>F: (585) 325-6005</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><a href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><a href="http://www.pathfinder-ea.com/">www.pathfinder-ea.com</a><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:18.0pt;font-family:Webdings;color:green'>P</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:green'> </span><span style='font-size:7.5pt;font-family:"Times New Roman","serif";color:green'>Sustainability – the forest AND the trees.</span><span style='font-size:18.0pt;font-family:Webdings;color:green'> P </span><span style='color:#1F497D'><o:p></o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Katherine Louman-Gardiner<br><b>Sent:</b> Thursday, April 28, 2011 1:49 PM<br><b>To:</b> bldg-sim@lists.onebuilding.org<br><b>Subject:</b> [Bldg-sim] eQuest - Model verification<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-CA>Hi All,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA>Our client would like us to produce an eQuest model that<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo2'><![if !supportLists]><span lang=EN-CA><span style='mso-list:Ignore'>a)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-CA>Can be easily adjusted to include current and recently recorded weather data<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo2'><![if !supportLists]><span lang=EN-CA><span style='mso-list:Ignore'>b)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-CA>Can be easily adjusted to reflect space occupancies and lighting loads<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo2'><![if !supportLists]><span lang=EN-CA><span style='mso-list:Ignore'>c)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-CA>Will reflect the actual building energy usage to within 1%<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA>Do any of you have experience trying to validate models like this? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA>My concern is that models are approximations, and will not account for small changes in occupancy, outdoor weather, etc. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA>I guess my questions are these:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span lang=EN-CA><span style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-CA>Even if I manage to put in daily occupant and fan schedules based on actual use, will the model be accurate enough to take me within 1%?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span lang=EN-CA><span style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-CA>We have been asked to remove plug loads (both for consumption purposes and cooling loads). Will this be too big of an assumption to get any accuracy out of the model in the future?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span lang=EN-CA><span style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-CA>How do I modify the weather input file?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span lang=EN-CA><span style='mso-list:Ignore'>4)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-CA>Are there any other ideas I’m missing that will help us validate a model as an absolute measure of actual building energy consumption?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA>Thank you for your help,<br>Katherine<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-CA>Katherine Louman-Gardiner, EIT<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA>Mechanical Engineer<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA><o:p> </o:p></span></p></div></body></html>