[Ibpsausa] Groundwater temperature estimating

[Joe Huang]

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.

The basic observation is that the ground temperature at 25-50' below grade is constant and 
roughly 1K above the average air temperature.
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.

This is still a rough calculation, and does not account for geothermal hot spots, such as 
Yellowstone, Mammoth Lakes, etc., where the
ground temperature will be significantly higher.

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.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"

On 12/23/2015 12:37 PM, Andrew Corney wrote:
> Hi All,
>
> 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?
>
> 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.
>
> Thanks in advance for any help anyone can provide.
>
> best regards,
>
> Andrew
>
> Andrew Corney • PE, M.CIBSE, M.ASHRAE
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