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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'>My hat is off to all of those who responded! I have plenty to think about and am smarter than I was. All good!<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><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., BEMP , LEED AP<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><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"'> Cheney [mailto:chenyu73@gmail.com] <br><b>Sent:</b> Friday, October 21, 2011 1:34 PM<br><b>To:</b> Jim Dirkes<br><b>Cc:</b> bldg-sim@lists.onebuilding.org<br><b>Subject:</b> Re: [Bldg-sim] Representing Hotel Occupancy<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>I quickly go through 90.1 UM and notice: <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>1. As per Appendix G, UM highlights that "these values may be used only if actual schedule are not know"; <o:p></o:p></p></div><div><p class=MsoNormal>2. As per schedule for occupancy -hotel/motel, the percent varies from 90% (night) to 20% (noon). It is quite reasonable to me provided no actual schedule are known. I guess you can further reduce it proportionally if you are able to get more info, such as optimal occupancy rate for the hotel. <o:p></o:p></p></div><div><p class=MsoNormal>3. There is no schedule for fan running 100% but HVAC system. You can understand it as running 100% on time for HVAC system with occupancy sensors since you have PTHP providing both conditioning and OA in individual rooms. Fan power will be calculated with respect to occupancy schedule in this manner. <o:p></o:p></p></div><div><p class=MsoNormal>4. Bear in mind, your baseline will be PTAC or PTHP for hotel. You will probably overestimate fan energy savings if you are to use the by-default schedule (and you believe the real occupancy rate will be differnt). <o:p></o:p></p></div><div><p class=MsoNormal>5. To me, such schedule is more important and sensitive for M&V modeling. I will not bother about using by-default occupancy schedule for LEED/incentive modeling. <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-family:"Comic Sans MS"'>Regards, </span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-family:"Comic Sans MS"'>Cheney</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-family:"Comic Sans MS"'>LinkedIN @ </span><a href="http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b" target="_blank"><span style='font-family:"Comic Sans MS"'>http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b</span></a><span style='font-family:"Comic Sans MS"'> </span><o:p></o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'><br><br><o:p></o:p></p><div><p class=MsoNormal>On Fri, Oct 21, 2011 at 8:51 AM, Jim Dirkes <<a href="mailto:jim@buildingperformanceteam.com">jim@buildingperformanceteam.com</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;font-family:"Georgia","serif"'>Dear Forum,<br>Assuming:</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:38.25pt'><span style='font-size:10.0pt;font-family:Symbol'>·</span><span style='font-size:7.0pt'> </span><span style='font-size:10.0pt;font-family:"Georgia","serif"'>10 story hotel with 200 guest rooms facing all compass directions </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:38.25pt'><span style='font-size:10.0pt;font-family:Symbol'>·</span><span style='font-size:7.0pt'> </span><span style='font-size:10.0pt;font-family:"Georgia","serif"'>Each guest room has HVAC and outdoor air from a through-the-wall heat pump</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;font-family:"Georgia","serif"'>How can I create a simple modeling scheme and schedules which will reflect normal occupancy variations?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;font-family:"Georgia","serif"'>As I think about it, the reality of operation is quite different than a central HVAC unit, because random individual rooms can be completely off, while others are on. Room temperature, ventilation and fan power are all affected. There will be no predictable pattern for which rooms are unused or unoccupied. ASHRAE does have some typical use patterns in their 90.1 User Manual but, for example, they assume 100% on time for fans. That's too coarse for my taste, and will overestimate energy substantially.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;font-family:"Georgia","serif"'>I REALLY don't want to model 200 individual zones with varying schedules! I know that I'm not the first one to wrestle with this idea, so I am hoping for some creative insight from you.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;font-family:"Georgia","serif"'>Thanks in advance!</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><img border=0 width=336 height=192 id="_x0000_i1025" src="cid:image001.jpg@01CC8FFB.0A786F50" alt="Description: BPT BizCard JVDII Updated"><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt'> </span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt'>Tolerance is not agreement. Tolerance is precisely the willingness to restrain from the use of coercion. (and who hasn’t experienced the benefit of respectful, constructive <u>dis</u>agreement?)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><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><o:p> </o:p></p></div></body></html>