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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:10.0pt;font-family:"Arial","sans-serif"'>Vipul,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>If the supply air from the DOAS is at (or near) room temperature, and “room temperature” is about the same in the corridor as in the apartments units, then in the model I would exhaust the air from the corridor that the air goes into. Keep in mind that the energy model does not have to replicate the exact systems in the building. The energy model is to estimate the energy use of the building. As long as the (simplified) modeled system uses about the same energy use as the (complicated) actual system you will still get reasonable results.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>If the DOAS supply air temperature is cooler or warmer than room temperature to help meet part of the space loads, then it gets more complicated. Most energy modeling programs, with a few special exceptions, cannot have two air systems serve the same space. In cases like that I have modeled an energy recovery system for each apartment unit instead of one big DOAS system. As long as the energy consumption is on a per cfm basis, the error from this method will be minimal. In the model the terminal unit coils will take the entire load, even though in reality part of the load will be handled by separate coils in the DOAS. If the DOAS coils have different fuel sources (like DX vs. chilled water, electric heat vs. hot water), then this approximation will be off. There will be more error if the big system modulates to meet changing conditions due to the part load curves, but as long as the systems are full on/full off the error will be minimal.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I hope this helps. Simplify as much as you can and remember that you are estimating energy usage.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Keith Swartz, PE, BEMP, LEED AP<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Senior Energy Engineer | <b>Energy Center of Wisconsin</b></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'> | <b>Madison.Chicago.Minneapolis<o:p></o:p></b></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>608.210.7123 | <a href="http://www.ecw.org/" title="Energy Center Home Page"><span style='color:black;text-decoration:none'>www.ecw.org</span></a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><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"'> Vipul Babriya [mailto:vipulbabriya@aol.com] <br><b>Sent:</b> Thursday, September 12, 2013 3:36 PM<br><b>To:</b> wbishop@pathfinder-ea.com; JHANSEN@ghtltd.com; equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] heat recovery and zone exhaust<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Hello Bill/James,<br><br>I have a typical situation for DOAS system that serves fresh air (100% OA) to corridor spaces in multifamily building. The DOAS unit is equiped with heat recovery wheel, and uses the exhaust air from apartments, i.e. exhaust from bathroom and kitchen rather than return air from corridor itself. How would i model the system that uses recovered heat from one system to another in the eQUEST.<br><br>Thanks in advance for your help.<br><br>Regards,<br>Vipul <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>-----Original Message-----<br>From: Bishop, Bill <wbishop@pathfinder-ea.com><br>To: James Hansen <JHANSEN@ghtltd.com>; equest-users <equest-users@lists.onebuilding.org><br>Sent: Wed, Dec 15, 2010 10:04 am<br>Subject: Re: [Equest-users] heat recovery and zone exhaust<o:p></o:p></span></p><div id="AOLMsgPart_3_8b2f44c9-b763-4672-84ec-c632fbd86388"><div><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>James,</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Make sure to NOT enter zonal exhaust flows if your intention is for the air to return to the ERV. Specifying zonal exhaust simulates air leaving the zone through a separate exhaust fan (think bathrooms, kitchens, clothes dryers) and not returning to the air handling unit.</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Regards,</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Bill</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><div><p class=MsoNormal><b><span 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 style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:#006600'>|</span></b><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'> Pathfinder Engineers & Architects LLP</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>Mechanical Engineer</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:5.0pt;font-family:"Arial","sans-serif";color:black'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:navy'>134 South Fitzhugh Street Rochester, NY 14608<br>T: (585) 325-6004 </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>Ext. 114</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:navy'>F: (585) 325-6005</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span 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 style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><a href="http://www.pathfinder-ea.com/" target="_blank">www.pathfinder-ea.com</a></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:18.0pt;font-family:Webdings;color:green'>P</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:green'> </span><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:green'>Sustainability – the forest AND the trees.</span><span style='font-size:18.0pt;font-family:Webdings;color:green'> P </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div></div><div><div class=MsoNormal align=center style='text-align:center'><span style='color:black'><hr size=2 width="100%" align=center></span></div><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black'> <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>James Hansen<br><b>Sent:</b> Wednesday, December 15, 2010 9:59 AM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] heat recovery and zone exhaust</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>I’m having the typical issues with getting an enthalpy wheel to show appreciable savings. I’ve adjusted some of the control sequences, and have managed to show a savings in cooling energy, but I’m getting no heating savings, which is strange, unless my building is actually asking for cold OA during the winter because of the rather large internal heat loads (my guess is that this is true).</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>My question is whether you HAVE to define zonal exhaust airflow rates to properly show the savings from heat recovery, or if the program knows that the exhaust will roughly match the OA delivered to the space? Do I have to turn on exhaust tracking?</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:teal'>GHT Limited<br></span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>James Hansen, PE, LEED AP</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Senior Associate</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>1010 N. Glebe Rd, Suite 200</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>Arlington, VA 22201-4749</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-338-5754 (Cell)</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-243-1200 (Office)</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-276-1376 (Fax)</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:teal'><a href="http://www.ghtltd.com/" target="_blank"><span style='font-size:10.0pt'>www.ghtltd.com</span></a></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#31849B'> </span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div></div></div></div><div id="AOLMsgPart_5_8b2f44c9-b763-4672-84ec-c632fbd86388"><pre style='background:white'><tt><span style='color:black'>_______________________________________________<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'>Equest-users mailing list<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'><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><o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'>To unsubscribe from this mailing list send a blank message to <o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'><a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></span></tt></pre></div></div></div></body></html>