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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'>Awesome analogies John!<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I was writing up a response simultaneously and took it into a few other directions specific to LEED… for anyone curious, I’m in full support of John’s response as well =). To add to the hat: our office predominantly sizes up equipment using HAP (with a smattering of Trace), and I’m familiar with tying the load reports for both into energy models under eQuest as a QC measure. <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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Will:<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><span style='font-family:"Calibri","sans-serif";color:#1F497D'>As a general QC practice, after everything is functionally set up and before “fine-tuning” steps like evaluating unmet hours, I will spot check and adjust as necessary to ensure an energy model is in the same <u>ballpark</u> as the designed loads, time permitting. Zones of notably high occupancy/ventilation/equipment loads get higher priority. In any model where you’re specifying equipment capacities (not autosizing), askew loads are a common suspect for unmet hours. Oftentimes, an energy model is wrapping up well after design loads are put together, and elements of design may have changed, so the energy model can in some fashion serve as a back-check for the load calcs as well.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I chose the word “ballpark” carefully: Trying to match loads precisely/exactly between different software packages, outside of an academic exercise, wouldn’t functionally accomplish much – acknowledging that even the most sophisticated load calculations are built on assumptions, estimations and weather predictions. I’ve encountered some model reviewers (outside of LEED, btw) who conceptually miss the fundamental differences of purpose between a load calc and an energy model… but don’t let such eye-rollers lead you astray =)!<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>That’s not to say one cannot use an energy model to do load calcs (some certainly do), but before going down that path I think it’s important to identify the calculations serve two tightly related but necessarily distinct purposes: <u>sizing equipment</u> (balancing “worst case” conditions against expected comfort and applying safety factors for present/future unknowns) and <u>evaluating energy behavior,</u> which means running with a longer set of assumptions (over time), permitting informed decisions for design to save $$$ on energy bills (or rainforests, if that’s your metric of choice). <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>“But Nick, I thought energy modeling was simply for LEED points…” Well, that’s what I thought getting started too, but I’ve grown to learn energy modeling produces much greater value than a plaque on the wall (hey, where’s mine anyway?): it informs better design (which I appreciate as an MEP consultant), while simultaneously saving really big money for our clientele (and the rest of us indirectly paying every month for ever-increasing energy infrastructure). Any indefinite environmental benefits, however fuzzy, are only icing on the cake.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Getting back to the original query: The energy modeling process for LEED, and specifically for 90.1 Appendix G by design avoids the necessity to sync loads precisely with a load calc – the emphasis is instead on having the elements match the proposed design. That said, you are expected to have equipment with capacities (heating/cooling/CFM/GPM) equivalent to what’s scheduled, so by extension you do want to be in the same ballpark as the designed loads to avoid excessive undercooled/heated hours… <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>~Nick</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><img width=119 height=37 id="Picture_x0020_1" src="cid:image001.jpg@01CC6407.E4F4D120" alt="cid:489575314@22072009-0ABB"></span><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'>NICK CATON, P.E.</span></b><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900'>SENIOR ENGINEER<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E'>Smith & Boucher Engineers</span><span style='font-size:7.5pt;color:#CC9900'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E'>25501 west valley parkway, suite 200<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E'>olathe, ks 66061<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E'>direct 913.344.0036<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E'>fax 913.345.0617<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue'> </span></u><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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>John Eurek<br><b>Sent:</b> Friday, August 26, 2011 3:25 PM<br><b>To:</b> Will Mak; bldg-sim@lists.onebuilding.org<br><b>Subject:</b> Re: [Bldg-sim] Loads to Energy Model<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal style='background:white'><span style='color:black'>Will<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'>Turning a file you used for load calculation and equipment sizing into an energy model is not a quick thing. Having the loads done is not half way. You now need to make schedules for lighting, equipment & people, get the 8760 weather file, find out energy cost in the area, input equipment information and a few more quick things as indicated in ASHRAE 90.1.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'>I explain it to people by saying 'Doing load calcs for equipment sizing is like taking 2 pictures, one in the summer and one in the winter. Making an energy model is like making a full length movie with special effects.' <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'>And don't forget that you need to make 2 full length movies, one which will be build and then spend time on an another pretend building (baseline) to compare it to.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'>Good luck man. We are here for you.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'>To answer the question, Yes, I use my Trace file I created for equipment sizing as the starting point for the energy model. <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'><br><br><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'><o:p> </o:p></span></p></div><div><div><p class=MsoNormal style='background:white'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> Will Mak <wmak@epsteinglobal.com><br><b>To:</b> bldg-sim@lists.onebuilding.org<br><b>Sent:</b> Friday, August 26, 2011 12:30 PM<br><b>Subject:</b> [Bldg-sim] Loads to Energy Model<br></span><span style='color:black'><br><br><o:p></o:p></span></p><div id=yiv651885776><div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Have any of you built an energy model for LEED from loads you have created for design? i.e. Trace/HAP load calcs and take it to energy modeling level?</span><span style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> </span><span style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><b><span style='font-family:"Arial","sans-serif";color:#C75B12'>William Mak, LEED AP BD+C</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br></span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:black'>Mechanical Design Engineer</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><br></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br></span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#C75B12'>EPSTEIN</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br></span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:black'>Architecture<br></span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#C75B12'>Interiors</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:black'><br>Engineering<br></span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#C75B12'>Construction</span><span style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:black'>Sustainability<br><br>600 West Fulton Street<br>Chicago, Illinois 60661-1259<br><br>D: (312) 429-8116<br>F: (312) 429-8800</span><span style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:black'>E:</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#0070C0'> <a href="mailto:wmak@epsteinglobal.com" target="_blank">wmak@epsteinglobal.com</a></span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:black'><br>W:</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#C75B12'> <a href="http://www.epsteinglobal.com/" target="_blank"><span style='color:#C75B12'>www.epsteinglobal.com</span></a></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><br><br></span><span style='font-size:10.0pt;font-family:Webdings;color:#00B050'>þ</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:black'> Epstein is a firm believer in sustainability. We ask that you please consider the environment before printing this e-mail.</span><span style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'> <o:p></o:p></span></p></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='color:black'><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><br><br><o:p></o:p></span></p></div></div></div></div></body></html>