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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'>Jamie,<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 ran into this same issue recently. You can use the same OA for all but set the ‘ON’ hours to -999. This will ignore the schedule for that hour and the zone calculations and inputs will control.<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=codeword>FRAC/DESIGN accepts a value which is the fraction of the design quantity. Typical values range between 0.0 and 1.0. An entry of –999 causes the schedule to be ignored for that hour.<o:p></o:p></p><p class=codeword> For example, in the SYSTEM:MIN-AIR-SCH, an entry of 0 or 1 will force the outdoor-air ratio to be 0% or 100% respectively. A value of –999 will cause the schedule to be ignored for the hour, and the outdoor-air ratio will be set by other calculations.<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dana<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:9.0pt;font-family:"Arial","sans-serif";color:#595959'>Mr. Dana Etherington, E.I.T., LEED AP BD+C </span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'>| <b>CRB </b>| One Kendall Square Ste B2202 | Cambridge, MA 02139</span><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:9.0pt;font-family:"Arial","sans-serif";color:#595959'>Main:</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'> 617-475-3050 <b>| Direct:</b> 617-475-3061 | <b>Mobile:</b> 617-583-3009 | <b>Fax:</b> 617-475-3052 | <b>Ext: 6061</b><o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959;layout-grid-mode:line'>Email:</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959;layout-grid-mode:line'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'><a href="mailto:dana.etherington@crbusa.com"><span style='color:#595959'>dana.etherington@crbusa.com</span></a> | <a href="http://www.crbusa.com/"><span style='color:#595959'>www.crbusa.com</span></a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'>________________________________________________________________________________________<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'><o:p> </o:p></span></p><p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#595959'>This document may contain confidential information and is intended for use by the addressee only. If you are not <o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#595959'>the intended recipient, please do not transmit, copy, disclose, or utilize this communication in any manner. If you <o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#595959'>received this message in error, please notify the sender immediately and delete this message.<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#595959'><o:p> </o:p></span></i></p><p class=MsoNormal><span style='font-family:Webdings;color:green'>ü</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:green'> Please consider the environment before printing this email.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'><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><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"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Armstrong, Jamie<br><b>Sent:</b> Thursday, June 07, 2012 6:20 PM<br><b>To:</b> Howe, Timothy; equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] Can't get unmet hours under control for cooling<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'>In regards to OA for PSZ RTU’s. <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'>When allowing eQuest to autosize the airflow to each space if you set a ratio of OA to supply air whatever eQuest calculates the supply air needed for that space will vary the outside airflow.<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 I enter the OA at the zone level to each space how do you set up a schedule for the OA? Based on Timothy’s answer I would need a different schedule for each RTU with its ratio of OA to supply air. I wanted the MinOA schedule to be an on/off flag to deliver the OA that I put in at the zone level according to the occupied schedule.<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span style='font-family:"Verdana","sans-serif";color:#404040'>Jamie Armstrong </span></b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#404040'>P.E.</span><b><span style='font-family:"Verdana","sans-serif";color:#404040'><br></span></b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#404040'>Mechanical Engineer<br><br><img border=0 width=264 height=53 id="Picture_x0020_1" src="cid:image001.jpg@01CD44DC.0533B0E0" alt="Description: Description: image001"><br><br>v. 210.546.0200 | www.dbrinc.com</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#404040'><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"'> Howe, Timothy [mailto:Timothy.Howe@stantec.com] <br><b>Sent:</b> Thursday, June 07, 2012 3:51 PM<br><b>To:</b> Armstrong, Jamie; equest-users@lists.onebuilding.org<br><b>Subject:</b> RE: Can't get unmet hours under control for cooling<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Jamie,<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'>You have some inconsistencies in your inputs for the OA on system RTU-2 (and all the rest). See highlighted area below. You are saying that the system is 100% recirc by setting the Minimum Outside Air ratio to 0.00, but your Minimum Air Schedule (note that this is a fraction of the design supply CFM type of input) is saying otherwise and takes precedence causing it to be a 100% OA system. See my snip from the hourly reports below too. You need to develop the proper ventilation rates for each system and verify with hourly reports. Do not rely on the summary tab in the air side system tab of eQUEST to give you correct data at all times. If you just define the OA by using the Minimum Outside Air ratio, you will be supplying OA every time the fan operates. To prevent this you need to set up Minimum Air Schedule for each system which is based upon the proper fractions for that system. <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=531 height=448 id="_x0000_i1025" src="cid:image002.png@01CD44DC.0533B0E0"><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=1024 height=661 id="_x0000_i1026" src="cid:image003.png@01CD44DC.0533B0E0"><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'><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='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>Timothy Howe, MS, LEED® AP BD+C</b><br>Mechanical Engineer<br>Stantec<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>61 Commercial Street<br>Rochester NY 14614<br>Ph: (585) 413-5347<br>Fx: (585) 272-1814<br>Cell: (585) 330-8681<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><a href="http://www.stantec.com"><b>stantec</b>.com</a> <o:p></o:p></p></div><div><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='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately.<o:p></o:p></p></div><div><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='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>ü Please consider the environment before printing this email. <o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>From:</b> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Armstrong, Jamie<br><b>Sent:</b> Thursday, June 07, 2012 4:23 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] Can't get unmet hours under control for cooling<o:p></o:p></p></div></div><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'>I need some help getting these cooling unmet hours under control. I have to get this model complete and submitted by tonight.<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'>We’ve tried multiple things to try to get the model to work out. <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'>We’ve tried the following:<o:p></o:p></p><p class=MsoListParagraph>· Letting eQuest autosize the heating and cooling for the PSZ units<o:p></o:p></p><p class=MsoListParagraph>· Verified that the schedules are consistent with both cooling, heating, and occupancy.<o:p></o:p></p><p class=MsoListParagraph>· On the baseline building we have the min cfm set to 0.5 for most spaces and 1 cfm/sf for some of the larger spaces.<o:p></o:p></p><p class=MsoListParagraph>· We set the PSZ –fan – flow parameter – indoor fan mode to intermittent to get the unit to show partial capacity thru out the days.<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'>One item is RTU-2 in my model. It serves only one space. We have a high amount of unmet hours on this and we are letting it auto size the capacity and airflow and it still says its not staying under control. We’re assuming that we are missing one small check box that’s somehow causing these unmet hours.<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'>I’ve attached the pd2 files for both baseline and proposed along with weather data and inp files.<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'>Thanks in advance for any help!<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'><b>Jamie Armstrong </b>P.E.<b><br></b>Mechanical Engineer<br><br><img border=0 width=264 height=53 id="_x0000_i1027" src="cid:image001.jpg@01CD44DC.0533B0E0" alt="Description: Description: image001"><br><br>v. 210.546.0200 | <a href="http://www.dbrinc.com">www.dbrinc.com</a><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></body></html>