<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Stephen,<div><br></div><div>I did the energy modeling on a small office building that has 9 GSHPs in it. The model showed a substantial savings over the baseline (similar to what you report). The baseline building used air-cooled rooftop units of standard efficiency. So far, the building is not quite as efficient as the model. While less than the baseline, the demand kW for the building is much higher than the demand predicted in the model. On the other hand, there are some control issues not relating to the GSHP units that may be causing the decreased efficiency.</div><div><br></div><div>One of the things I noticed about my model is that eQUEST predicted that the aux electric heat would almost never run. I am not sure that this is the case in reality, and if the changes to the controls do not improve the building performance, that is the next thing I will check.</div><div><br></div><div>Chuck<br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; "><br class="Apple-interchange-newline">Charles Ladd, PE, AIA</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Principal Engineer</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Williard Ferm Architects, PA</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">122 Cox Avenue</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Raleigh, NC, 27605</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">W: 919.834.0620 ext. 106</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">F: 919.834.2149</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; "><a href="mailto:chuck@williardferm.com">chuck@williardferm.com</a></font></p></span></div></span></div></span> </div><br><div><div>On Apr 24, 2009, at 3:48 PM, Karen Walkerman wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Are all zones satisfied without too many over or under-heated hours? eQuest will not auto-size your ground loop for you, and if it's not large enough, your energy use will be really low, but the people in the space will be freezing or roasting, depending on the season.<br> <br>Have you made the switch in detailed edit mode or in the wizard? If it's in detailed edit mode, there are all kinds of things that can trip you up a bit.<br><br>--<br>Karen<br><br><div class="gmail_quote">On Fri, Apr 24, 2009 at 1:15 PM, Anthony Hardman <span dir="ltr"><<a href="mailto:Anthony@geoenergyservices.com">Anthony@geoenergyservices.com</a>></span> wrote:<br> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div link="blue" vlink="purple" lang="EN-US"> <div><p><span style="font-size: 11pt; color: rgb(31, 73, 125);">Two quick things to check would be the supplemental electric heat (for the air-source system) as well as your loop field design parameters. Your numbers could be correct if it’s in an extremely cold climate, you’ve oversized the loop field or your loop field ground thermal properties are unrealistic for the area in question. </span></p><div><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span><br class="webkit-block-placeholder"></div> <div><p><b><span style="font-size: 11pt; color: rgb(31, 73, 125);">Anthony Hardman</span></b></p><p><span style="font-size: 11pt; color: black;">Mechancial Engineer</span></p><p><span style="font-size: 11pt; color: black;">LEED AP</span></p><div><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span><br class="webkit-block-placeholder"></div><p><span style="font-size: 14pt; color: rgb(155, 187, 89);">Geo-Energy Services</span></p><p><span style="font-size: 11pt; color: black;">14250 E Easter Pl, STE C</span></p><p><span style="font-size: 11pt; color: black;">Centennial, CO 80112</span></p><p><span style="font-size: 11pt; color: black;">303-531-5292 v</span></p><p><span style="font-size: 11pt; color: black;">303-805-3563 f</span></p><p><span style="font-size: 11pt; color: black;">720-273-9973 c</span></p><p><u><span style="color: rgb(0, 112, 192);"><a href="http://www.geoenergyservices.com" target="_blank"><span style="color: blue;">www.GeoEnergyServices.com</span></a></span></u></p> </div><div><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span><br class="webkit-block-placeholder"></div> <div> <div style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;"><p><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Stephen Parker<br> <b>Sent:</b> Friday, April 24, 2009 3:03 AM<br> <b>To:</b> equest-users<br> <b>Subject:</b> [Equest-users] GSHP Simulation Results</span></p> </div> </div><div><div></div><div class="h5"><div> <br class="webkit-block-placeholder"></div> <div><p><span style="color: black;">Hello everyone,<br> <br> I have modeled a ground source heat pump within the building I have designed and have been getting results that seem almost too good to be true. I decided to compare my results with a typical high efficiency air side heat pump and discovered that the geothermal system is operating about 65-75% better than the air side heat pump in terms of cost. The results from the air side heat pump appear to be correct and are reasonable for my design.<br> <br> Has anybody else ever gotten results for a geothermal system design that were much better than expected? If so, was there something incorrect within your model or have you deemed it as an internal flaw of eQUEST? This project is for my masters thesis, so I am trying to justify my results as much as possible. For my system I am using two 3.5 ton GSHPs with an EER of 21.8 and a COP of 4.4, which is rather efficient. <br> <br> Thanks,<br> <br> Stephen Parker<br> Bucknell University</span></p> </div> </div></div></div> </div> <br>_______________________________________________<br> Equest-users mailing list<br> <a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br> To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><br> <br></blockquote></div><br> _______________________________________________<br>Equest-users mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG<br></blockquote></div><br></div></body></html>