Re: [EnergyPlus_Support] ground tempertures

["Michael J. Witte" <mjwitte@xxxxxxxx>]

It is true that the statistics file (.stat) that is distributed with the 
weather data files lists such ground temperatures, but these are open field 
ground temps.  They are useful as inputs to ground heat exchangers or ponds, 
but not under the floor of a conditioned building.  

EnergyPlus has a 3-d heat transfer preprocessor which will calculate monthly 
average ground temperatures for slabs and basements.  This is the most accurate 
approach.  Please read the Input Output Reference (ground temperatures) and 
Auxiliary Programs (ground heat transfer) documents for more details.  There is 
also discussion there of reasonable default values to use.

Mike


On 12 Apr 2006 at 9:53, Joe Huang wrote:

> What ground temperatures are you interested in ?  I believe the EPW weather 
> files contain the average monthly ground temperatures for 5 ft (1.33 m) 
> below grade calculated using a simple equation developed by Tom Kusuda at 
> the US National Bureau of Standards (now NIST) back in the early 1970's. 
> The constant deep ground temperature, in the absence of geothermal 
> anomalies, is the same as the average annual air temperature plus 1 C.
> 
> Joe Huang
> LBNL
> ----- Original Message ----- 
> From: "hk wong" <wonhk001@xxxxxxxxxxxx>
> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Wednesday, April 12, 2006 9:28 AM
> Subject: [EnergyPlus_Support] ground tempertures
> 
> 
> >
> > Hi Sir,
> >
> > Can you please tell me how (and where) to get the
> > value of ground temperatures for the location, for
> > example, Adelaide, South Australia?
> >
> > I look forward to hearing your response soon!!
> >
> > Cheers,
> > Ken
> >
> >
> >
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> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
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> Yahoo! Groups Links
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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