[Ibpsausa] Groundwater temperature estimating

Wed Jan 6 11:29:11 PST 2016

Andrew,

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.

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.

Ralph

Ralph Muehleisen, Ph.D., P.E., LEED AP, FASA, INCE Bd. Cert.
Principal Building Scientist, Argonne National Laboratory
Joint Staff, Computation Institute, University of Chicago
Adjunct Associate Professor, Illinois Institute of Technology
muehleisen at gmail.com, cel:708-655-9954

On Wed, Jan 6, 2016 at 12:57 PM, Neal Kruis <
neal.kruis at bigladdersoftware.com> wrote:

> Andrew,
>
> EnergyPlus has source for the Kusuda algorithm here
> <https://github.com/NREL/EnergyPlus/blob/develop/src/EnergyPlus/GroundTemperatureModeling/KusudaAchenbachGroundTemperatureModel.cc#L188>.
> 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.).
>
> Neal Kruis
> 720 583-5587
>
> Vice President
> Big Ladder Software
> 1624 Market Street, Suite 304
> Denver, CO 80202
> bigladdersoftware.com
>
>
> On Mon, Jan 4, 2016 at 8:50 AM, Andrew Corney <andrew.corney at sefaira.com>
> wrote:
>
>> Hi Nick and everyone who replied - thank you all for your help. It's
>> great to see so much support in the community :-)
>>
>> 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.
>>
>> Have a great new year all look forward to catching up in 2016.
>>
>> Andrew
>>
>> Andrew Corney • PE, M.CIBSE, M.ASHRAE
>>
>> Product Director
>>
>> Sefaira - Sustainability • Performance • Design
>>
>> M +44 (0)7887 059 722
>>
>> T +44 (0)2037 147 619
>>
>> Skype andrew.corney.sefaira
>>
>>
>> Read this article
>> <http://continuingeducation.bnpmedia.com/article.php?L=480&C=1446> in
>> Architecture Record and complete a quiz to earl AIA and GBCI credit
>>
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>>
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>>
>>
>> On Mon, Jan 4, 2016 at 2:47 PM, Nicholas Caton <ncaton at catonenergy.com>
>> wrote:
>>
>>> Hi Andrew!
>>>
>>> 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.
>>>
>>> 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 ;-).
>>>
>>> Of course if you're lucky someone will reply with a direct answer -
>>> here's hoping!
>>>
>>> ~Nick
>>> On Dec 23, 2015 2:38 PM, "Andrew Corney" <andrew.corney at sefaira.com>
>>> 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
>>>>
>>>> Product Director
>>>>
>>>> Sefaira - Sustainability • Performance • Design
>>>>
>>>> M +44 (0)7887 059 722
>>>>
>>>> T +44 (0)2037 147 619
>>>>
>>>> Skype andrew.corney.sefaira
>>>>
>>>>
>>>> Read this article
>>>> <http://continuingeducation.bnpmedia.com/article.php?L=480&C=1446> in
>>>> Architecture Record and complete a quiz to earl AIA and GBCI credit
>>>>
>>>> This email was sent from Sefaira UK Ltd.
>>>>
>>>> For company contact and registration information, please visit:
>>>> http://www.sefaira.com/info/contact
>>>>
>>>>
>>>>
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