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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText>Hi Ben,<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>In this case, it looks like the usual suspect: reheat. If you shut off your dehumidification limit of 50%, it eliminates the summer heating issue. <o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Also, I don’t know how much control you have over your economizer settings, but if you haven’t <a href="http://www.taylor-engineering.com/downloads/articles/ASHRAE%20Journal%20-%20Economizer%20High%20Limit%20Devices%20and%20Why%20Enthalpy%20Economizers%20Don't%20Work%20-%20Taylor%20&%20Cheng.pdf">read this article</a>, I’d strongly suggest it. As an interesting aside – that author’s comments on RH sensor reliability matches well with what I’ve found on a recent project. Here’s a little data I’ve gathered from a college campus. I harvested 24hr trend data from all the buildings that were measuring OA humidity (y-axis in %). The fat blue line is what I got from the National Weather Service for the area and each other line represents a building’s OA humidity sensor. I think in total these sensors control at least 25 AHU’s enthalpy economizers. From what I can tell, they don’t have a regular PM routine for calibrating/replacing these sensors. Just something to consider…<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><img border=0 width=913 height=664 id="Picture_x0020_2" src="cid:image003.png@01CD1BAC.28B09B40"><o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Eric O'Neill <o:p></o:p></p><p class=MsoPlainText>608.785.3328 | MICHAELS ENERGY<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>-----Original Message-----<br>From: equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] On Behalf Of modeling@jeisenhart.com<br>Sent: Friday, April 13, 2012 8:44 PM<br>To: equest-users@lists.onebuilding.org<br>Subject: [Equest-users] Heating in Summer</p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Hello Everyone!<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Here's a puzzle for the email group. (I hope you're having a better<o:p></o:p></p><p class=MsoPlainText>weekend than me!)<o:p></o:p></p><p class=MsoPlainText>I've searched the archived emails to find a solution, but most seem to ask<o:p></o:p></p><p class=MsoPlainText>for the PD2 and INP file so that makes me think that the solutions will<o:p></o:p></p><p class=MsoPlainText>mostly be unique.<o:p></o:p></p><p class=MsoPlainText>I'm attaching a zip file of my model.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>I have packaged single zone units with electric resistence heat. I'm<o:p></o:p></p><p class=MsoPlainText>seeing a significant load in the summer on all units. I've dropped the<o:p></o:p></p><p class=MsoPlainText>thermostat in the summer months on the heating and am still getting a<o:p></o:p></p><p class=MsoPlainText>load. Any ideas on why there would be a load?<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Thanks,<o:p></o:p></p><p class=MsoPlainText>Ben<o:p></o:p></p></div></body></html>