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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>Hi Simge,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>You have two options where the exhaust air flow rate is higher than supply air flow rate:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'> 1. if the exhaust fan schedule is equal to or longer than the supply fan schedule, then re-balance the supply air in your model to account for transfer air from other zones, or<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'> 2. if the exhaust fan schedule is shorter than the supply fan schedule, you can de-rate the exhaust fan flow and fan power (eg 1000 cfm for 1 hour = 250 cfm for 4 hours). <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>Shaun<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><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Shaun Martin LEED AP<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Principal<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Shaun Martin Consulting<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>2060 Pine Street<o:p></o:p></span></i></p><p class=MsoNormal><i><span lang=FR-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Vancouver, BC V6J 4P8<o:p></o:p></span></i></p><p class=MsoNormal><i><span lang=FR-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>P: 604-789-1095<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>E: smartin@shaunmartinconsulting.com<o:p></o:p></span></i></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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><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>Simge Andolsun<br><b>Sent:</b> Tuesday, November 12, 2013 8:16 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] Fwd: Exhaust Fans<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><br>Another option can be balancing the high amount of air extracted from the zone with infiltration instead of from the air handler, but I believe this would increase the number of unmet hours in the system. As per Appendix G, the total unmet hours of the baseline and as-built models need to be 300 or less. Thus, this option did not seem like a good approach to me as well.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><div><p class=MsoNormal>Thank you very much,<o:p></o:p></p></div><div><p class=MsoNormal>Best Regards,<o:p></o:p></p></div><div><p class=MsoNormal>S.Andolsun, PhD <o:p></o:p></p></div></div><div><p class=MsoNormal><br> <o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>---------- Forwarded message ----------<br>From: <b>Simge Andolsun</b> <<a href="mailto:simgeandolsun@gmail.com">simgeandolsun@gmail.com</a>><br>Date: Tue, Nov 12, 2013 at 9:52 AM<br>Subject: Exhaust Fans<br>To: "<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><br><o:p></o:p></p><div><div><p class=MsoNormal>Dear eQuest users,<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>I am trying to model a lab building in compliance with ASHRAE 90.1 to compare it with an as built model that represents the real case as described in Appendix G. The actual building (the as built model) has a few zones which have exhaust air flow rate higher than supply air flow rate as per the building schedules. I unfortunately do not have any information regarding the operation schedule of the exhaust fans. When I model the exhaust air flow rates of these zones to be always lower than the zone supply air flow rate, then the actual building is not represented closely enough. When I increase the zone supply air flow rate such that it is always equal to the actual exhaust air flow rate, then the zone air flow rate is assumed to be higher than it actually is increasing the overall energy consumption of the building. eQuest does not allow for the exhaust air flow rate of a zone to be higher than the supply air flow rate which would result in high unmet hours in the zone. In order to make a reasonable comparison between the baseline and the as built models as per Appendix G, how do you think I should represent the exhaust fans in these two models? and why? Would you also explain the settings I should use in eQuest to model the case you are suggesting? I would appreciate it very much.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Thank you very much,<o:p></o:p></p></div><div><p class=MsoNormal>Best Regards,<o:p></o:p></p></div><div><p class=MsoNormal>S.Andolsun, PhD <o:p></o:p></p></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>