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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'>Unmet hours for occupied hours only has been discussed but there was no good consensus on exactly how to do this. So, yes, unmet hours are of the entire (8,760) simulation and are building level, meaning one zone or all zones unmet that hour is still just one unmet hour.<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'>Trane CDS has a good document for combating unmet hours in TRACE 700. I think it’s probably generic enough to be used for any tool.<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><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>Scott Hintz<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Tahoma","sans-serif";color:#1F497D'>CEM, LEED-AP BD+C, BEMP</span></b><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'>HVAC & Energy<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'>Sustaining Systems Engineering (SSE)<br></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><img width=55 height=9 id="_x0000_i1026" src="cid:image002.png@01CCB372.DF76CBD0" alt="cid:image003.jpg@01CB8011.2E333BA0"> </span><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'>Federal Technical Services</span><span style='font-size:8.0pt;font-family:"Calibri","sans-serif";color:#17365D'><br></span><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'>PO Box 21025, M/C: ISC-4011<br>Kennedy Space Center, FL 32899<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'>Building: M6-493, Office: 1100H2<br>(321) 867-8533 office <br>(321) 867-5810 fax<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="mailto:henry.d.turner@nasa.gov"><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif"'>scott.f.hintz@nasa.gov</span></a></span><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'><o:p></o:p></span></p></div></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"'> Bishop, Bill [mailto:wbishop@pathfinder-ea.com] <br><b>Sent:</b> Monday, December 05, 2011 9:03 AM<br><b>To:</b> Rathna Shree; bldg<br><b>Subject:</b> Re: [Bldg-sim] Number of unmet hours<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Rathna,<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'>The simulation covers 8760 hours, but this does not imply 8760 hours of fan operation. I don’t see anything in Appendix G that requires you to prorate the 300 unmet load hours based on the schedules of building operation. So, just stick with the 300 hour threshold.<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 suggest you follow your four-step procedure (in eQUEST or other DOE-2), except that I’ve never had unmet plant loads so I’m not sure how I would take that into account. I disagree with Ashu – adding up all the unmet hours in all SS-R reports can double-count (or more) coincident unmet hours.<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'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Bill<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><a href="mailto:wbishop@pathfinder-ea.com"><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:black;text-decoration:none'><img border=0 width=481 height=118 id="Picture_x0020_1" src="cid:image003.png@01CCB372.DF76CBD0"></span></b></a><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'><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>Ashu Gupta<br><b>Sent:</b> Monday, December 05, 2011 5:45 AM<br><b>To:</b> 'Rathna Shree'; 'bldg'<br><b>Subject:</b> Re: [Bldg-sim] Number of unmet hours<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Ratnashree,<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'>You can directly see no of unmet hours for each system from SS-R report and total number of hours (all systems) should not be exceed 300 hours.<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'>Thanks!<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ashu<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><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>Rathna Shree<br><b>Sent:</b> Monday, December 05, 2011 3:59 PM<br><b>To:</b> bldg<br><b>Subject:</b> [Bldg-sim] Number of unmet hours<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='font-family:"Arial","sans-serif";color:black'>Dear All,<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>The following is the procedure i use to calculate unmet hours:<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>1)<span class=tab> </span>Percentage of Plant and system unmet is got from BEPU report. <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>2)<span class=tab> </span>The number of hours fan is on is got from SS-E report. <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>3)<span class=tab> </span>Percentage of system unmet(BEPU) multiplied by number of fan on hours(SS-E) gives the Unmet hours. <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>4)<span class=tab> </span>Plant and system unmet together should not exceed 300 hours.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>But as per ASHRAE 90.1, the 300hours of unmet is w.r.t. a simulation for 8760 hours. If the building is only 8 hours working 5 days a week, then the fan on hours vary. Will the same 300 hours hold good for 3500 hours of operation also.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>The maximum percentage of Unmet for 8760 hours of operation is 3.4% amounting to 300 hours. Do we have to take 3.4% of the total fan on hours to calculate maximum unmet hours if the fan on hours is anything other than 8760?<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>Please help.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>Regards,<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>Rathnashree<o:p></o:p></span></p></div></div></div></body></html>