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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=blue><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Matt,<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'>If you want to do the comparison of the two files to figure out where the problem actually was, you can use something like WinMerge to compare the text inp or bdl files side by side. It will highlight the differences between the two files for you.<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'>Glad you got it running though.<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'>Alex<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><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Matt Clough<br><b>Sent:</b> March 23, 2012 8:16 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] Unmet Hours<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US style='font-family:Optima;color:navy'>An Update!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:Optima;color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:Optima;color:navy'>I was unable to directly fix the model, but I did return to a previous save and re-do the changes I had made in order to correct the unmet hours. I suppose I could carefully compare the BDL files of the two models to see where the differences are. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:Optima;color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:Optima;color:navy'>In the rebuild, I set the supply flows at the system level and set outside air requirements at the zone level. I also fiddled with the schedules some, but that was mostly to see how those work. The new model performs closer to expectation and has a lower energy usage than the baseline model.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:Optima;color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:Optima;color:navy'>Thanks for all the help!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:Optima;color:navy'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:Optima;color:navy'>Matt Clough<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><div><div class=MsoNormal align=center style='text-align:center'><span lang=EN-US><hr size=2 width="100%" align=center></span></div><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Matt Clough <br><b>Sent:</b> Wednesday, March 21, 2012 6:17 AM<br><b>To:</b> 'John Aulbach'; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> RE: [Equest-users] Unmet Hours</span><span lang=EN-US><o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>All,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>I just wanted to follow up on this. I was able to recover the unmet hours by declaring a minimum flow density (cfm/f^2) . I also implemented John’s suggestion of widening the deadband, although I suppose I should have performed each of these changes individually in order to see which one contributes most to an acceptable simulation. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>After doing this I began making the system definitions match the equipment specs on the drawings (supply flow rate, outside air flow rate) but now the proposed model reports extremely high energy usage (millions of MBtu). I’m pretty sure that the baseline design is not more efficient than the proposed. It seems like the systems run at no less than 50% all the time (per the summary tab). My hunch is that this is a problem related to schedules, but I’m really stumped and wanted to see if any of you gurus have suggestions. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Regards, <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Matt<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><div><div class=MsoNormal align=center style='text-align:center'><span lang=EN-US><hr size=2 width="100%" align=center></span></div><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> John Aulbach [<a href="mailto:jra_sac@yahoo.com">mailto:jra_sac@yahoo.com</a>] <br><b>Sent:</b> Friday, March 16, 2012 9:07 AM<br><b>To:</b> Matt Clough; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Unmet Hours</span><span lang=EN-US><o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='color:black'>Matt:<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='color:black'>I will look at your run later. But for the VAVs, make sure your thermostats are reverse acting, then increase the deadband to 4 or even 6 deg F.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='color:black'>John Aulbach<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='color:black'>Partner Energy<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='color:black'><o:p> </o:p></span></p></div><div><div><div><div class=MsoNormal align=center style='text-align:center;background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><hr size=1 width="100%" align=center></span></div><p class=MsoNormal style='background:white'><b><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> Matt Clough <<a href="mailto:mclough@kme-inc.com">mclough@kme-inc.com</a>><br><b>To:</b> "<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>" <<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>> <br><b>Sent:</b> Friday, March 16, 2012 8:00 AM<br><b>Subject:</b> [Equest-users] Unmet Hours</span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><p class=MsoNormal style='background:white'><span lang=EN-US style='color:black'><o:p> </o:p></span></p><div id=yiv1505557420><div><div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>All right Folks,</span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> </span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>It’s time to do that thing again where we talk about unmet hours. I’ll give a little background first: I’m new to equest and to the HVAC industry, so bear with me. The project is a 1F school building (pre-k) with a clerestory, split into 10 zones and predominantly served by series VAV terminals using chilled water and hot water loops. It’s in Houston , TX so and are no economizers. I’ve spent the majority of the past few days reading previous discussions and trying a variety of changes. I have attached the INP and PD2 for convenience.</span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> </span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>I initially tried to represent the system based on the mechanical/electrical schedules, but that yielded many unmet hours (99%), so it is currently set to auto-size, but am still at about 600 unmet hours (7%). 7 of the zones are series VAV, 2 are single-zone with reheat, and one is a packaged single zone for the MDF room.</span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><ul type=disc><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3;background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Changing to an auto-sized system provided a large reduction in UH. </span><span lang=EN-US><o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3;background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>am trying to not manipulate the data by adjusting the cooling/heating ratio. </span><span lang=EN-US><o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3;background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The setpoints are 75c/72h. I tried changing them a few degrees in either direction, but did not get a large enough reduction. </span><span lang=EN-US><o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3;background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>have the fans cycling at night (no OA), which did help reduce the hours</span><span lang=EN-US> <o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3;background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>switched into DDE and set actual CFM from the mechanical plans. This resulted in an increase</span><span lang=EN-US> <o:p></o:p></span></li></ul><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> </span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>As I am looking through the LS-B report, it seems like some of my zone loads might be a little high with some of the heat generation loads at about 12kbtu/h. I think my inexperience hampers my ability to troubleshoot some of the problems because I don’t necessarily have a good sense for what a reasonable result/prediction is. </span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> </span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>I appreciate any assistance on this matter and am open to suggestions as far as proper modeling techniques and troubleshooting methods.</span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> </span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Sincerely,</span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Matt Clough</span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Mechanical Designer</span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>KME Engineering</span><span lang=EN-US style='color:black'><o:p></o:p></span></p></div></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span lang=EN-US style='color:black'><br>_______________________________________________<br>Equest-users mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></span></p></div></div></div></div></body></html>