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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'>Hassan, Kathryn’s suggestion to use baseboards attached to a boiler are probably your best bet. I just wanted to add that you can add a cooling tower to your ground loop just like you would any other condenser loop. <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:"Calibri","sans-serif";color:#0F243E'>Anthony Hardman, PE<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>LEED AP BD&C</span></b><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#0F243E'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>Building Performance Analyst<o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#00B050'>The Green Engineer, LLP<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#00B050'>Sustainable Design Consulting<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>50 Beharrell St<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>Concord, MA 01742<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>O: 978/610-2801<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>C: 720/840-7862<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"'> Kathryn Kerns [mailto:kathryn.kerns@bceengineers.com] <br><b>Sent:</b> Thursday, October 13, 2011 12:07 PM<br><b>To:</b> Maudud Quazi; equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] Modelling Geothermal with back up boiler and coolingtower<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div id=idOWAReplyText1249><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>I have been thinking about this problem and I haven't had a chance to try it, but I wonder if you couldn't add baseboard heating to the building and attach a boiler and only run the baseboard system at low OSA temperatures when you know the ground loop system isn't going to be big enough to take care of heating. That might take care of the extra boiler heating problem. The only thing I can think of to do for the cooling is to add a DOA to your HVAC system that has a cooling coil connected to a fluid cooler and running it when the OSA temperature is high.</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I suggest the above system because I am pretty sure you can't add a boiler or a fluid cooler to a ground loop.</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>It also might be possible to start with a WLHP system and see if you can't add an additional fluid cooler and a boiler. Then increase the efficiencies of the additional fluid cooler and boiler so the take on the energy characteristics of a ground loop and arrange for these more efficient devices to run during median OSA temperature conditions.</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hmmm, anybody have any other ideas? Carol, nice to see hear from you again.</span><o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="100%" align=center></div><p class=MsoNormal style='margin-bottom:12.0pt'><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 on behalf of Maudud Quazi<br><b>Sent:</b> Wed 10/12/2011 12:44 PM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] Modelling Geothermal with back up boiler and coolingtower</span><o:p></o:p></p></div><div><p class=MsoNormal>Hello all,<br><br>I am modelling a HVAC system that uses geothermal as primary source of heating and cooling. However, it uses a boiler for winter peak and a cooling tower for summer peak hours. Both of these uquipments are connected to the geothermal loop. Can anyone please give me some idea as to how I can model this system. Before, I tried connecting a boiler to GSHP loop in the detailed mode but eQuest did not allow me to do that. Thanks for your help.<br><br>Regards,<br><br>Hassan<o:p></o:p></p></div></div></body></html>