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Here's an older but more compact version of the Kusuda algorithm
written in Fortran 77, just 20 lines of code but you have to give it
the following information:<br>
<br>
DIFF = soil diffusivity<br>
DBTMIN = minimum average monthly air temperature<br>
DBTMAX = maximum average monthly air temperature<br>
DBTYAV -= average annual air temperature<br>
<br>
The output is TG, the average monthly ground temperature.<br>
<br>
I stripped this from the DOE-2.1E program, and gave it to the
EnergyPlus Team back in 2002 (?) for use in their weather processing
program. Although the subroutine is structured to produce average
monthly ground temperatures, I suggest that you code it to do daily
or at least weekly calculations (but using a "running" month, i.e.,
calculate DBTMIN and DBTMAX from -15 to +15 days around the day) to
avoid the monthly staircase of temperatures using the algorithm at
the monthly timestep.<br>
<br>
Joe<br>
<br>
<pre class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
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</pre>
<div class="moz-cite-prefix">On 1/6/2016 10:57 AM, Neal Kruis wrote:<br>
</div>
<blockquote
cite="mid:CAOG8z515_tORWkO5H=gRk8rY3fMXtM3aScLSB-rOH_82-dD4pA@mail.gmail.com"
type="cite">
<div dir="ltr">Andrew,
<div><br>
</div>
<div>EnergyPlus has source for the Kusuda algorithm <a
moz-do-not-send="true"
href="https://github.com/NREL/EnergyPlus/blob/develop/src/EnergyPlus/GroundTemperatureModeling/KusudaAchenbachGroundTemperatureModel.cc#L188">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 color="#000000"
size="4">Neal Kruis</font></div>
<div style="font-size:13px"><a moz-do-not-send="true"
href="tel:720%20583-5587" value="+17205835587"
target="_blank">720 583-5587</a></div>
</font></span>
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moz-do-not-send="true"
src="http://bigladdersoftware.com/epx/logo_sm.png"
height="37" width="96"><br>
</font></span><span>
<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>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Jan 4, 2016 at 8:50 AM, Andrew
Corney <span dir="ltr"><<a moz-do-not-send="true"
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 class="HOEnZb"><font color="#888888">
<div><br>
</div>
<div>Andrew</div>
</font></span></div>
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<div class="gmail_quote">On Mon, Jan 4, 2016 at 2:47
PM, Nicholas Caton <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:ncaton@catonenergy.com"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:ncaton@catonenergy.com">ncaton@catonenergy.com</a></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 moz-do-not-send="true"
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>
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