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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='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Weighing in late on this….<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If I get >80% R-squared correlation, I think I’m doing well! <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>There are so many unknowns, including the normal situation that the client doesn’t know their own operating schedules, occupancy patterns, or maintenance / calibration procedures….<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:13.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>The Building Performance Team<br></span></b><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>James V. Dirkes II, P.E., LEED AP, BEMP<br></span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>1631 Acacia Drive NW<br>Grand Rapids, MI 49504<br>616 450 8653<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:.5in'><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>Karen Walkerman<br><b>Sent:</b> Thursday, April 28, 2011 3:31 PM<br><b>To:</b> Carol Gardner<br><b>Cc:</b> bldg-sim@lists.onebuilding.org<br><b>Subject:</b> Re: [Bldg-sim] eQuest - Model verification<o:p></o:p></span></p></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><div><p class=MsoNormal style='margin-left:.5in'>Also, a model that is calibrated to actual building use and weather can help to highlight building operation issues. I have had models which were off from actual operating energy use that I was able to determine how the building was operating inefficiently.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>In one case, I created a model of an existing building. For this model, I made an actual count of lighting fixtures and computers. For most of the year, there were few other electrical loads. I based on their occupancy and use schedules, I was not quite able to calibrate the electrical energy use. When I met with the client, I informed him that my model showed somewhat lower electrical use, equivalent to 1/3 of the computers remaining on 24-hours per day. As it turned out, about 1/3 of the employees DID leave their computers on at all times so that they could log in remotely.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>... I guess what I'm saying is that maybe the goal is not to get the model within 1% of the building energy use, but get the building within 1% of the model.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>--<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Karen<o:p></o:p></p></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><div><p class=MsoNormal style='margin-left:.5in'>On Thu, Apr 28, 2011 at 3:20 PM, Carol Gardner <<a href="mailto:cmg750@gmail.com">cmg750@gmail.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>Bill summed it up really well, Katherine. Sometimes a client will think a calibrated model must match the real building by an unrealistically high number, like 1%. I really can't imagine an instance when that would be desirable. It certainly would be costly to achieve. <o:p></o:p></p><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Usually the plan is to use the calibrated model as a tool to examine various energy saving measures/opportunities that the client may be interested in implementing. It is important to remember, in this case that you are looking at the usage between the calibrated model and the ECM model, so the 1% deviation is consistent in both and not a worry.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in'>Carol<o:p></o:p></p><div><div><div><p class=MsoNormal style='margin-left:.5in'>On Thu, Apr 28, 2011 at 12:03 PM, Bishop, Bill <<a href="mailto:wbishop@pathfinder-ea.com" target="_blank">wbishop@pathfinder-ea.com</a>> wrote:<o:p></o:p></p></div></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'>Katherine,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'>The questions I would have for you (or your client) are:</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;color:#1F497D'> </span><span style='color:#1F497D'>Is this an existing building, or something in the design phase?</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;color:#1F497D'> </span><span style='color:#1F497D'>What is the model going to be used for?</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;color:#1F497D'> </span><span style='color:#1F497D'>Is there something magical about the 1% number?</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;color:#1F497D'> </span><span style='color:#1F497D'>1% of what? Annual electrical consumption? Annual gas consumption? Both? Monthly electric/gas consumption? Monthly/annual electrical demand?</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;color:#1F497D'> </span><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.</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;color:#1F497D'> </span><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?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><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.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'>I suggest searching the bldg-sim and equest-users archives for information about weather files.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'>Oh, one more question – how much money does your client have?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'>Regards,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'>Bill</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#1F497D'> </span><o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><b><span style='font-size:10.0pt;color:black'>William Bishop, PE, BEMP, LEED<sup>®</sup> AP </span></b><b><span style='font-size:10.0pt;color:#006600'>|</span></b><b><span style='font-size:10.0pt;color:black'> Pathfinder Engineers & Architects LLP</span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='font-size:9.0pt;color:black'>Mechanical Engineer</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='font-size:5.0pt;color:black'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><b>Error! Filename not specified.</b><span style='font-size:9.0pt;color:#1F497D'>134 South Fitzhugh Street Rochester, NY 14608<br>T: <a href="tel:%28585%29%20325-6004" target="_blank">(585) 325-6004</a> </span><span style='font-size:9.0pt;color:black'>Ext. 114</span><span style='color:#1F497D'> </span><span style='font-size:9.0pt;color:#1F497D'>F: <a href="tel:%28585%29%20325-6005" target="_blank">(585) 325-6005</a></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='font-size:9.0pt;color:black'><a href="mailto:wbishop@pathfinder-ea.com" target="_blank">wbishop@pathfinder-ea.com</a> <a href="http://www.pathfinder-ea.com/" target="_blank">www.pathfinder-ea.com</a></span><o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='font-size:18.0pt;font-family:Webdings;color:green'>P</span><span style='color:green'> </span><span style='font-size:7.5pt;color:green'>Sustainability – the forest AND the trees.</span><span style='font-size:18.0pt;font-family:Webdings;color:green'> P </span><o:p></o:p></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><b><span style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Katherine Louman-Gardiner<br><b>Sent:</b> Thursday, April 28, 2011 1:49 PM<br><b>To:</b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br><b>Subject:</b> [Bldg-sim] eQuest - Model verification</span><o:p></o:p></p></div></div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span lang=EN-CA>Hi All,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span lang=EN-CA>Our client would like us to produce an eQuest model that</span><o:p></o:p></p><p style='margin-left:.5in'><span lang=EN-CA>a)</span><span lang=EN-CA style='font-size:7.0pt'> </span><span lang=EN-CA>Can be easily adjusted to include current and recently recorded weather data</span><o:p></o:p></p><p style='margin-left:.5in'><span lang=EN-CA>b)</span><span lang=EN-CA style='font-size:7.0pt'> </span><span lang=EN-CA>Can be easily adjusted to reflect space occupancies and lighting loads</span><o:p></o:p></p><p style='margin-left:.5in'><span lang=EN-CA>c)</span><span lang=EN-CA style='font-size:7.0pt'> </span><span lang=EN-CA>Will reflect the actual building energy usage to within 1%</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span lang=EN-CA>Do any of you have experience trying to validate models like this? </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span lang=EN-CA>My concern is that models are approximations, and will not account for small changes in occupancy, outdoor weather, etc. </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span lang=EN-CA>I guess my questions are these:</span><o:p></o:p></p><p style='margin-left:.5in'><span lang=EN-CA>1)</span><span lang=EN-CA style='font-size:7.0pt'> </span><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%?</span><o:p></o:p></p><p style='margin-left:.5in'><span lang=EN-CA>2)</span><span lang=EN-CA style='font-size:7.0pt'> </span><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?</span><o:p></o:p></p><p style='margin-left:.5in'><span lang=EN-CA>3)</span><span lang=EN-CA style='font-size:7.0pt'> </span><span lang=EN-CA>How do I modify the weather input file?</span><o:p></o:p></p><p style='margin-left:.5in'><span lang=EN-CA>4)</span><span lang=EN-CA style='font-size:7.0pt'> </span><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?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span lang=EN-CA>Thank you for your help,<br>Katherine</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span lang=EN-CA> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span lang=EN-CA>Katherine Louman-Gardiner, EIT</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span lang=EN-CA>Mechanical Engineer</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span lang=EN-CA> </span><o:p></o:p></p></div></div></div></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div></div><p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in'>_______________________________________________<br>Bldg-sim mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to <a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG" target="_blank">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p></blockquote></div><p class=MsoNormal style='margin-left:.5in'><br><br clear=all><br>-- <br>Carol Gardner PE<o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in'><br>_______________________________________________<br>Bldg-sim mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to <a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div></body></html>