<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am modeling a two-story elementary school with a VRV / DOAS system in one area (classrooms, admin.), and a VAV system in another (gym, cafeteria, food prep.). The unmet heating hours are currently around 750, and I am at my wit’s end to reduce them further. I have incorporated suggestions such as increasing the throttling range (currently at 6, helped a little bit) and sizing ratio (currently at 1.15, although increasing to 2.00 did not help much). As I have also tried my best to model the VRV / DOAS system, I’m still not sure if it is correct… I’ve just picked up what I could from the users archives.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Does anyone have suggestions for reducing the unmet heating hours that I may not be aware of? I have attached the .inp file. Can anyone see glaring mistakes in the model?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='font-size:14.0pt;font-family:"Arial","sans-serif"'>Chris Swanson</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mechanical Designer</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Roger D. Fields & Associates</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Columbus, Ohio 43220-2777</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>E-mail: <a href="mailto:cswanson@rdfa.com" title="blocked::mailto:cswanson@rdfa.com"><span style='color:blue'>cswanson@rdfa.com</span></a></span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>