<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 12 (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>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m modeling a 1940s-era apartment building with a legacy heating system – hot water radiators supplied by boilers. We’re considering the building for a geothermal retrofit, and we’ve established a calibrated building model. The heat pump will use the existing hot water distribution piping to hydronically heat and cool the building – the radiators will be replaced with fan/coil units to circulate indoor air. To accurately obtain the loads on the heat pump, I need to have 0% outside air. Is there a way in eQuest to turn the OA fraction to 0?<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>Drew Morrison<o:p></o:p></p><p class=MsoNormal>Engineer<o:p></o:p></p><p class=MsoNormal><b>Haley & Aldrich, Inc.<o:p></o:p></b></p><p class=MsoNormal>8899 Gander Creek Drive<o:p></o:p></p><p class=MsoNormal>Miamisburg, OH 45342-5432<o:p></o:p></p><p class=MsoNormal>Office: 937.530.1431<o:p></o:p></p><p class=MsoNormal>Cell: 937.307.2223<o:p></o:p></p><p class=MsoNormal><a href="amorrison@haleyaldrich.com">amorrison@haleyaldrich.com</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>