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[EnergyPlus_Support] Re: What will the weather file override?



I would be cautious about using SummerExtreme and WinterExtreme if you are using the simulations for sizing. I have found that they tend to under-size. 


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "jkneifel_florida" <jkneifel_florida@...> wrote:
>
> In summary,... 
> 
> (1) I can delete the site:location from the file because the weather file will override it anyways
> 
> (2) I can replace the SizingPeriod:DesignDays with SizingPeriod:WeatherFileDays and SizingPeriodWeatherFileConditionType (SummerExtreme as summer design day and WinterExtreme as winter design day) because it will automatically use the weather file data. I will have to change the location up to 15 times within a climate zone. So it would be faster to use the weather file designators because I would not have to copy and paste the design days from each city's DDY file. Will I get the same results with this approach, or is it actually better to use SizingPeriod:DesignDays?
> 
> (3) I should change the Site:GroundTemperatureBuilding Surface to match the location. Are the ground temperatures available somewhere? Such as in one of the Data Set files? I have not been able to find them anywhere.
> 
> (4) It would be preferred to use the location's precipitation. Currently, the E+ EFG does not specify the precipitation. But if I use the SizingPeriod:WeatherFile approach it will use the rain and snow indicators from the weather file.
> 
> Am I understanding the above correctly? Thanks.
> 
> 
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@> wrote:
> >
> > Attaching a new weather file only changes/overrides the site:location 
> > parameters.
> > 
> > SizingPeriod:DesignDay are the best indicators if you are doing 
> > autosizing of your building and  you would need to change 
> > them.  Site:GroundTemperature only needs to be used if you have 
> > ground contact from your building surfaces -- ideally you would 
> > change them as well.
> > 
> > Another option would be to use the 
> > SizingPeriod:WeatherFileConditionType along with extreme period 
> > designators (SummerExtreme, WinterExtreme) but this is a bit tenuous 
> > as all weather files (though I think most in the US) might not have a 
> > SummerExtreme or WinterExtreme period.
> > 
> > Of course, if you are using Site:Precipitation, you would need to 
> > change that.  Not sure about the pollution factors, construction 
> > costs, tariffs -- those you would have to think about.  And the 
> > terrain field in the Building object -- though you may wish to run 
> > all in the same kind of "terrain".
> > 
> > EnergyPlus Development Team
> > 
> > 
> > At 09:26 AM 7/20/2009, jkneifel_florida wrote:
> > >I am currently using the EFG to create a standard compliant building 
> > >in a particular climate zone. I would like to change the location 
> > >characteristics within that climate zone (e.g. Phoenix to New 
> > >Orleans) to run the same simulation in a different city. What 
> > >parameters in the IDF file will be overridden by the weather file 
> > >and what will I need to change by hand? From what I can figure out, 
> > >the weather file seems to only override the Site:Location but I 
> > >still need to input SizingPeriod:DesignDay and Site: 
> > >GroundTemperature for the simulation to run. Am I correct? Or is 
> > >there an easier way to change the location characteristics? Also, 
> > >are there other parameters that I need to change that I am forgetting? Thanks.
> > >
> > >
> > >
> > >------------------------------------
> > >
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> > >
> > >
> >
>




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