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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:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Michael,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>To add to what Paul mentioned about 2-way valves;<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>What are your building loads looking like in the eQuest output reports? There are 2 potential scenarios that may lead to limited savings from a properly modeled VFD installation;<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If the pump is under sized for the loads input <o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If the loads are constant and mostly internal<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Kind Regards<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:gray'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:gray'>Joe Fleming </span></b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:gray'>|<b> PE, </b>LEED AP BD+C, BEMP</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><i><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:gray'>Commissioning Agent & Energy Consultant </span></i><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:gray'>| </span><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#A4B12D'>The Spinnaker Group</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#7F7F7F'><a href="mailto:joe@thespinnakergroupinc.com"><span style='color:#7F7F7F'>joe@thespinnakergroupinc.com</span></a></span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><b><i><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:gray'>Cell</span></i></b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:gray'> 561-602-3132 | <b><i>Office</i></b> 754-800-3100 </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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 [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Mike Schaefer<br><b>Sent:</b> Thursday, June 18, 2015 2:49 PM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] VFD Pumping<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>I’ve performing an energy model to compare VFD Chiller pumping and Constant Volume Chiller pumping for a multi-story office building using eQUEST v 3.65. Although I expect to save pump energy utilizing VFD pumping I’m not seeing a savings and I believe this is due to my “Pump Properties Inputs”.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>For both the VFD and constant volume pump scenarios I’ve input the scheduled pump flow (1,300 gpm) and head (200 ft) and the other pump inputs are default values. The energy difference between the two pumping scenarios is negligible, however, if I set the pump gpm to a default, which inputs a 1.00 Flow Ratio, the energy savings is significant in the VFD pumping model. <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Am I over defining the pumps by inputting the scheduled pump gpm? Should the pump gpm always be set to default?<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><span style='font-family:"Calibri","sans-serif"'><br><br></span><strong><span style='font-family:"Arial","sans-serif"'>Michael</span></strong><span style='font-family:"Calibri","sans-serif"'><br> <o:p></o:p></span></p></div></div></body></html>