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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='color:#1F497D'>Thank you for the reply Bill. I have not yet tried modeling the system as IU yet but might have to if I can’t get the work-around to work for me. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I just want to understand how eQuest is modeling my inputs. Right now I have a Single Zone Reheat system with a dummy zone attached to it, currently with no loads in the dummy zone. Outdoor air from the SZR system is attached to FCUs, UFAD, displacement ventilation and chilled beam systems. I’ve modeled the FCUs, UFAD & displacement vent. systems as a FCU system type in eQuest and the Chilled Beams as an IU system in eQuest. In eQuest, you cannot input any info on R/A for a Fan Coil system, while you can for an IU system.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>What I want is the return air from all zones to make it back to the HRV but eQuest is not seeing any R/A. So for the HRV to see a higher R/A temp I have to add a load to the dummy zone? Will eQuest see this load before it delivers outside air to the other systems? Or does the air get distributed to the dummy zone and other systems concurrently? Thanks for any clarifications.<o:p></o:p></span></p><p class=MsoNormal><span style='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"'> Bishop, Bill [mailto:wbishop@pathfinder-ea.com] <br><b>Sent:</b> April-14-11 4:35 PM<br><b>To:</b> Kasun, Darryl; equest-users@lists.onebuilding.org<br><b>Subject:</b> RE: [Equest-users] HRVs with Active Chilled Beams<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-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Darryl,<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'>This is probably the most common work-around situation in eQUEST. I’ve heard a rumor that some brave modeler out there uses a dummy zone for heat recovery by adding just the right space load (on a separate meter) to the dummy zone to tweak the return air temperature back to the HRV. I tend not to read the “dummy zone” posts so this might be more common than I am aware. Instead, I suggest you abandon the dummy zone approach and model the AHU/HRV using the Induction Unit system type. The IU system allows heat recovery and zonal CHW coils, but does have its drawbacks (e.g. no VAV). You might need to break out the FCUs as separate systems to account for the fan energy. I haven’t been “fortunate” enough yet to model displacement ventilation but perhaps another eQUEST work-arounder will chime in.<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'>Bill<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><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'>William Bishop, PE, BEMP, LEED<sup>®</sup> AP </span></b><b><span lang=EN-US style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:#006600'>|</span></b><b><span lang=EN-US style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'> </span></b><b><span lang=EN-US style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'>Pathfinder Engineers & Architects LLP</span></b><b><span lang=EN-US style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'><o:p></o:p></span></b></p><p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>Mechanical Engineer<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:5.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f">
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</v:shape><![endif]--><![if !vml]><span style='mso-ignore:vglayout;position:absolute;z-index:-1;margin-left:367px;margin-top:17px;width:60px;height:58px'><img width=60 height=58 src="cid:image003.jpg@01CC14A7.63A2A840" v:shapes="_x0000_s1026"></span><![endif]><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:navy'>134 South Fitzhugh Street</span><span lang=EN-US style='font-size:9.0pt;color:navy'> </span><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:navy'>Rochester, NY 14608</span><span lang=EN-US style='font-size:9.0pt;color:navy'><br></span><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:navy'>T: (585) 325-6004 </span><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>Ext. 114</span><span lang=EN-US style='color:navy'> </span><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:navy'>F: (585) 325-6005</span><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><a href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a> </span><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><a href="http://www.pathfinder-ea.com/">www.pathfinder-ea.com</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:18.0pt;font-family:Webdings;color:green'>P</span><span lang=EN-US style='color:green'> </span><span lang=EN-US style='font-size:7.5pt;color:green'>Sustainability – the forest AND the trees.</span><span lang=EN-US style='font-size:18.0pt;font-family:Webdings;color:green'> P </span><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif";color:green'><o:p></o:p></span></p></div><div><div class=MsoNormal align=center style='text-align:center'><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><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"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Kasun, Darryl<br><b>Sent:</b> Thursday, April 14, 2011 2:29 PM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] HRVs with Active Chilled Beams</span><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal>I’ve been attempting to model a building that has two AHUs complete with HRVs that serve active chilled beams, FCUs and displacement ventilation. Based on some threads I’ve seen on here, I’ve set up the air to supply from the HRVs through a dummy zone and to the subsequent air systems that model the ACBs, FCUs, etc. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’ve ran the model and no air is making its way back from the zones served by the ACBs, FCUs ,etc to the HRVs. How is this accomplished? Thanks<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width="100%" style='width:100.0%'><tr style='height:41.25pt'><td width=77 rowspan=2 valign=top style='width:57.75pt;padding:0cm 0cm 0cm 0cm;height:41.25pt'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:7.5pt;font-family:"Times New Roman","serif";color:#7D7D7D'><img border=0 width=60 height=97 id="_x0000_i1026" src="cid:image004.jpg@01CC14A7.63A2A840"></span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p></td><td width=1440 valign=top style='width:1080.0pt;padding:0cm 0cm 0cm 0cm;height:41.25pt'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span 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