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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='color:#1F497D'>Vikram,<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'>Changing the value to 0.001 was the solution. Thanks. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>Jeremy Rapoza, P.E., LEED AP, Design Engineer</span><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0'>I BVH Integrated Services I</span></b><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:black'> </span></b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>860.286.9171 tel </span><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0'>I</span></b><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'> </span></b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>860.242.0236 fax</span><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0'> <b>I</b></span><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'> </span></b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>50 Griffin Road South, Bloomfield CT 06002 </span><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0'>I <a href="http://www.bvhis.com/" title="http://www.bvhis.com/"><span style='font-weight:normal'>www.bvhis.com</span></a></span></b><span style='color:#1F497D'><o:p></o:p></span></p></div><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 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"'> Sami, Vikram [mailto:Vikram.Sami@perkinswill.com] <br><b>Sent:</b> Wednesday, December 21, 2011 5:35 PM<br><b>To:</b> Jeremy N. Rapoza; 'equest-users@lists.onebuilding.org'<br><b>Subject:</b> RE: Compressor usage with economizer<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Jeremy,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Another thing I noticed in your model is that the schedule you have built for outside air doesn’t allow for the economizer to come online. If you use the value 0.001 in the fraction schedule it makes the economizer available.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#DCAA2C'><o:p> </o:p></span></b></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Vikram Sami</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>, LEED AP BD+C<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Sustainable Design Analyst<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>1315 Peachtree St. NE, Atlanta, GA 30309<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>t: 404-443-7462 f: </span><span lang=ES style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>404.892.5823 </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> e: vikram.sami@perkinswill.com </span><span style='color:#1F497D'><a href="http://www.perkinswill.com/"><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray;text-decoration:none'>www.perkinswill.com</span></a></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'><o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:3.0pt;text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Perkins+Will.</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#ADD425'>Ideas + buildings that honor the broader goals of society</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:green'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p></div><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 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>Sami, Vikram<br><b>Sent:</b> Wednesday, December 21, 2011 2:53 PM<br><b>To:</b> Jeremy N. Rapoza; 'equest-users@lists.onebuilding.org'<br><b>Subject:</b> Re: [Equest-users] Compressor usage with economizer<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Not sure if this is the reason, but the three units you mentioned all have “no” as the value for lockout compressor in the economizer tab. Try turning these to yes and see if it solves the problem. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#DCAA2C'><o:p> </o:p></span></b></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Vikram Sami</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>, LEED AP BD+C<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Sustainable Design Analyst<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>1315 Peachtree St. NE, Atlanta, GA 30309<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>t: 404-443-7462 f: </span><span lang=ES style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>404.892.5823 </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> e: <a href="mailto:vikram.sami@perkinswill.com">vikram.sami@perkinswill.com</a> </span><span style='color:#1F497D'><a href="http://www.perkinswill.com/"><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray;text-decoration:none'>www.perkinswill.com</span></a></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'><o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:3.0pt;text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Perkins+Will.</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#ADD425'>Ideas + buildings that honor the broader goals of society</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:green'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p></div><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 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>Jeremy N. Rapoza<br><b>Sent:</b> Wednesday, December 21, 2011 1:54 PM<br><b>To:</b> 'equest-users@lists.onebuilding.org'<br><b>Subject:</b> [Equest-users] Compressor usage with economizer<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am currently having a problem where the compressors on my DX units are still kicking on during the Winter months even though I have an OA economizer. This change in results happened after I added Demand Control Ventilation as a parametric run. The overall savings were greater, but I was surprised how much cooling increased in the winter. My design is using Bridgeport, CT weather.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have attached the .pd2, .inp, and .prd files. My concern is only for units labled RTU-1, AHU-2, and AHU-3. Please ignore all the little PSZ’s. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have done a thorough search through the archives and have found this <a href="http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2008-November/000614.html">link</a> to be the most similar to my problem, but I don’t see any resolutions that fully fixed my problem.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Here are two of the screen shots of how I set up RTU-1, which is essentially the same as the 2 other units:<o:p></o:p></p><p class=MsoNormal><img border=0 width=480 height=342 id="Picture_x0020_1" src="cid:image001.jpg@01CCC53B.F9FE0BA0"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><img border=0 width=539 height=314 id="Picture_x0020_2" src="cid:image002.jpg@01CCC53B.F9FE0BA0"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Other notes: I only have a few unmet hours. SS-A report will show that winter cooling is more of a problem with RTU-1 and AHU-3. AHU-2 happens to be a 100% OA unit for Kitchen makeup and it has much less winter cooling load (not surprising since it is 100% OA so it is ‘economizing’ all the time. I also have modeled this project in Trace and the results in Trace have no winter cooling as expected (this project is a training exercise for me in eQuest.)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Any help is appreciated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>Jeremy Rapoza, P.E., LEED AP, Design Engineer</span><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0'>I BVH Integrated Services I</span></b><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:black'> </span></b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>860.286.9171 tel </span><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0'>I</span></b><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'> </span></b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>860.242.0236 fax</span><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0'> <b>I</b></span><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'> </span></b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>50 Griffin Road South, Bloomfield CT 06002 </span><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0'>I <a href="http://www.bvhis.com/" title="http://www.bvhis.com/"><span style='font-weight:normal'>www.bvhis.com</span></a></span></b><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br></span><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>This email and any files transmitted with it are confidential and intended solely for the addressee. 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