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Are you talking about ground temperatures or groundwater
temperatures? The temperatures in the processed weather files
(*.bin, *.epw) are ground temperatures calculated as a sinusoidal
curve obtained from average monthly air temperatures, with a lag
time of about 100 days and a dampening factor as a function of the
soil depth. This is quite approximate and based on work done by the
late Tamami Kusuda at the National Bureau of Standards (NBS, now
NIST) back in the early 1980's. The algorithm is very simple, about
20 lines of Fortran code, and I believe described in the EnergyPlus
engineering documentation. If not, I can strip the subroutine out of
DOE-2 and post it. <br>
<br>
The basic observation is that the ground temperature at 25-50' below
grade is constant and roughly 1K above the average air temperature.
<br>
The closer to the ground surface, the larger is the amplitude of the
sine curve and the smaller the phase lag from that of the air
temperature. There are several books that describe this, including
the Foundation Design Handbook, Labs, Carmody et al, Univ. of
Minnesota, 1988, etc. <br>
<br>
This is still a rough calculation, and does not account for
geothermal hot spots, such as Yellowstone, Mammoth Lakes, etc.,
where the<br>
ground temperature will be significantly higher. <br>
<br>
For groundwater temperatures, there are maps available in the
literature and online. These are generally very similar to the
ground temperature, but based on measurements of well temperatures.<br>
<br>
Joe<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
"building energy simulations at your fingertips"
</pre>
<div class="moz-cite-prefix">On 12/23/2015 12:37 PM, Andrew Corney
wrote:<br>
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<blockquote
cite="mid:CAPOOC+Ofwh7kXDpK4keNDANhdgjdTizYPuGUdhiNsg+qGs50LA@mail.gmail.com"
type="cite">
<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">
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