<div dir="ltr">Andrew,<div><br></div><div>The Kusuda algorithm that Neal mentioned can also be found in the back of standard EN 15241 "Energy Losses due to Ventilation and Infiltration in Commercial Buildings" in Annex A devoted to computing heat transfer in earth tubes. I summarized it in a simbuild paper "Simple Design Tools for Earth-Air Heat Exchangers" which you can find and download via google. The only difference between the EN 15241 and the implementation in EnergyPlus is that EN 15241 does a series expansion of an exponential and uses a sine instead of cos for the phase shift term.</div><div><br></div><div>If you are looking for something a bit more detailed or accurate, you might try googling with "soil temperature" rather than "ground temperature". People in agriculture usually use the term soil temperature and they've been in the lead on this type of research.</div><div><br></div><div>Ralph</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Ralph Muehleisen, Ph.D., P.E., LEED AP, FASA, INCE Bd. Cert.<br>Principal Building Scientist, Argonne National Laboratory</div><div>Joint Staff, Computation Institute, University of Chicago<br>Adjunct Associate Professor, Illinois Institute of Technology<br><a href="mailto:muehleisen@gmail.com" target="_blank">muehleisen@gmail.com</a>, cel:708-655-9954 <br></div></div></div></div></div></div>
<br><div class="gmail_quote">On Wed, Jan 6, 2016 at 12:57 PM, Neal Kruis <span dir="ltr"><<a href="mailto:neal.kruis@bigladdersoftware.com" target="_blank">neal.kruis@bigladdersoftware.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Andrew,<div><br></div><div>EnergyPlus has source for the Kusuda algorithm <a href="https://github.com/NREL/EnergyPlus/blob/develop/src/EnergyPlus/GroundTemperatureModeling/KusudaAchenbachGroundTemperatureModel.cc#L188" target="_blank">here</a>. As Joe mentioned, this is a pretty crude estimate. For a more accurate estimate you might want to use a finite difference calculation that takes into account the surface boundary conditions (solar, wind, IR radiation to the sky, etc.).</div><div><br></div><div><div dir="ltr"><span style="font-size:12.8000001907349px"><font color="#888888"><div style="font-size:13px"><font size="4" color="#000000">Neal Kruis</font></div><div style="font-size:13px"><a href="tel:720%20583-5587" value="+17205835587" target="_blank">720 583-5587</a></div></font></span><div style="font-size:13px"><span><font color="#888888"><img width="96" height="37"><br></font></span><span><div style="color:rgb(136,136,136);text-align:center"></div><div><font color="#000000">Vice President</font></div><div><font color="#000000">Big Ladder Software</font></div><div><font color="#000000">1624 Market Street, Suite 304</font></div><div><font color="#000000">Denver, CO 80202</font></div><div style="color:rgb(136,136,136)"><a href="http://bigladdersoftware.com/" target="_blank">bigladdersoftware.com</a></div></span></div></div>
<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 4, 2016 at 8:50 AM, Andrew Corney <span dir="ltr"><<a href="mailto:andrew.corney@sefaira.com" target="_blank">andrew.corney@sefaira.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Nick and everyone who replied - thank you all for your help. It's great to see so much support in the community :-)<div><br></div><div>So it turns out what I was actually after was a way to generate ground temperatures for a random set of weather data. Someone kindly send me the fortran script that E+ uses for its EPW files which is exactly what I needed.</div><div><br></div><div>Have a great new year all look forward to catching up in 2016.</div><span><font color="#888888"><div><br></div><div>Andrew</div></font></span></div><div class="gmail_extra"><span><br clear="all"><div><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><span style="color:rgb(29,58,114);font-family:'Helvetica Neue';font-size:12px;font-weight:700;white-space:pre-wrap;line-height:1.38;background-color:transparent">Andrew Corney • PE, M.CIBSE, M.ASHRAE</span><br></div><div><p dir="ltr" style="font-size:12.8px;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Product Director </span></p><span style="font-size:12.8px"><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Sefaira - Sustainability • Performance • Design</span></p></span><p dir="ltr" style="font-size:12.8px;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">M <a href="tel:%2B44%20%280%297887%20059%20722" value="+447887059722" style="color:rgb(17,85,204)" target="_blank">+44 (0)7887 059 722</a></span></p><p dir="ltr" style="font-size:12.8px;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent"><span style="line-height:16.56px">T <a href="tel:%2B44%20%280%292037%20147%20619" value="+442037147619" style="color:rgb(17,85,204)" target="_blank">+44 (0)2037 147 619</a></span><br></span></p><p dir="ltr" style="font-size:12.8px;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent"><span style="line-height:16.56px">Skype andrew.corney.sefaira</span></span></p><p dir="ltr" style="font-size:12.8px;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent"><span style="line-height:16.56px"><br></span></span></p><p style="font-size:12.8px;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent"><span style="line-height:16.56px">Read<a href="http://continuingeducation.bnpmedia.com/article.php?L=480&C=1446" target="_blank"> this article</a> in Architecture Record and complete a quiz to earl AIA and GBCI credit</span></span></p><div><br></div><p dir="ltr" style="font-size:12.8px;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10.6667px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">This email was sent from Sefaira UK Ltd.</span></p><span style="font-size:12.8px"><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10.6667px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">For company contact and registration information, please visit:</span><span style="font-size:10.6667px;font-family:'Helvetica Neue';vertical-align:baseline;white-space:pre-wrap;background-color:transparent"> </span><span style="color:rgb(17,85,204);text-decoration:underline;font-size:10.6667px;font-family:'Helvetica Neue';vertical-align:baseline;white-space:pre-wrap;background-color:transparent"><a href="http://www.sefaira.com/info/contact" style="color:rgb(17,85,204);text-decoration:none" target="_blank">http://www.sefaira.com/info/contact</a></span></p><div><span style="color:rgb(29,58,114);font-family:'Helvetica Neue';font-size:12px;font-style:italic;line-height:16.56px;white-space:pre-wrap"><br></span></div><div><br></div></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
<br></span><div><div><div class="gmail_quote">On Mon, Jan 4, 2016 at 2:47 PM, Nicholas Caton <span dir="ltr"><<a href="mailto:ncaton@catonenergy.com" target="_blank">ncaton@catonenergy.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">Hi Andrew!</p>
<p dir="ltr">Oklahoma State University in Stillwater, OK produces quite a bit of research concerning the developing science of ground source wellfield system design and verification. Also, individuals I personally consider leaders in our circles of energy simulation when it comes to anything ground source spent time with that department. </p>
<p dir="ltr">If there exists an established best practice for extrapolating ground temperatures (short of direct measurement), there's a good chance someone at that institution knows and possibly even derived the answer ;-). </p>
<p dir="ltr">Of course if you're lucky someone will reply with a direct answer - here's hoping!<br></p>
<p dir="ltr">~Nick</p>
<div class="gmail_quote"><div><div>On Dec 23, 2015 2:38 PM, "Andrew Corney" <<a href="mailto:andrew.corney@sefaira.com" target="_blank">andrew.corney@sefaira.com</a>> wrote:<br type="attribution"></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr">Hi All,<div><br></div><div>Does anyone know of a peer-reviewed paper / methodology they could share with me that describes a process for converting annual weather data into monthly groundwater temperatures?</div><div><br></div><div>Obviously a lot of EPW files already have ground water temperatures but many don't and a lot of other weather data doesn't have that information so it'd be great to know if there was a well-recognised process for making those estimates.</div><div><br></div><div>Thanks in advance for any help anyone can provide.</div><div><br></div><div>best regards,</div><div><br></div><div>Andrew</div><div><br clear="all"><div><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><span style="color:rgb(29,58,114);font-family:'Helvetica Neue';font-size:12px;font-weight:700;white-space:pre-wrap;line-height:1.38;background-color:transparent">Andrew Corney • PE, M.CIBSE, M.ASHRAE</span><br></div><div><p dir="ltr" style="font-size:12.8px;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Product Director </span></p><span style="font-size:12.8px"><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:'Helvetica Neue';color:rgb(68,68,68);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Sefaira - 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