Re: [EnergyPlus_Support] Ground Temperature Calculation

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

I see the problem.  In the statistics file (.stat) for ITA_Milano-Linate_IGDG, 
the values for monthly average Global Horizontal solar (search the file for 
"Global Avg") are NA.  This is OK for EnergyPlus, because it uses the direct 
and diffuse solar components.  But the Slab preprocessor (and I would guess the 
Basement one as well) are apparently using the Global Horizontal solar values 
which are not present in some (or all?) of the IGDG epw files.  So, for now, 
you will have to find a different format weather file for a similar climate to 
use with the slab program.

I will ask if these can be reprocessed to fill in the global horizontal data 
using the direct and diffuse data.

Mike



On 7 Oct 2006 at 19:32, davidedelloro wrote:

> Dear all,
> I am building an energyplus model for a low-rise building located in
> Milan. 
> I am using the RunSlab batch file placed inside the PreProcessor
> folder (GrndTempCalc) for calculating the monthly ground temperature.
> When I used the weather files ITA_Milano-Linate_IGDG,
> ITA_Milano-Malpensa_IGDG and ITA_Milan_IWEC .epw the program run
> without showing any error (from the .GER file: Program
> Version,GroundTempCalc - Slab, Version .6, GroundTempCalc Completed
> Successfully-- 0 Warning; 0 Severe Errors; Elapsed Time=00hr 00min
> 18sec) but the .GTP file doesn't report any correct temperature
> values, showing instead the "N" value in every column.
> To be sure it was not caused by my incorrect .idf input file, I run
> the simulation with the ITA_Genova_IWEC, SVN_Ljubljana_IWEC,
> CHE_Geneva_IWEC and DKN_Copenhagen_IWEC .epw files and I succeeded in
> obtaining temperature forecasts.
> I also run the SlubExample with the USA_IL_Chicago-OHare_TMY2 and
> ITA_Milano-Linate_IGDG .epw files and I obtained the same results: the
> TMY2.epw file run correctly, the IGDG.epw didn't, displaying again
> columns with "N" value in the .GTP file.
> I also tryed IGDG and IWEC.epw files fo several other italian cities
> and I obtained the same "N" value.
> I would like to know if other users found this problem and what is the
> best way to proceed.
> Thanks
> --Davide
> 
> 
> 
> 
> 
> 
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> 
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>  
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> 
> 
> 
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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