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Re: [EnergyPlus_Support] Defining DesignDays based on the weather file



I have wondered about this, have been using Extreme weather file days (per Linda's advise)
So I will say run a building for 50 weather locations, then have results but then re-run later with design days. 
I have been schooled on why design days matter, but still wonder how large of a difference it really makes to use design day (where you get the option to choose your peaks) or a weather file extreme week. Something seems more accurate with the extreme week due to the lack of human ability to choose, but again from what I am told design days is a more accurate way to go..

Name Summer Extreme Weather File 
Period Selection SummerExtreme
Day of Week for Start Day Monday
Use Weather File Daylight Saving Period Yes
Use Weather File Rain and Snow Indicators Yes


Name Winter Extreme Weather File 
Period Selection WinterExtreme
Day of Week for Start Day Monday
Use Weather File Daylight Saving Period Yes
Use Weather File Rain and Snow Indicators Yes


Jeremiah D. Crossett
CleanTech Analytics
503-688-8951
www.cleantechanalytics.com


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On Fri, Jun 1, 2012 at 2:59 PM, Dru Crawley <dbcrawley@xxxxxxxxx> wrote:
 

The problem with using days from the weather files is that they often don't have anything as extreme as the long-term period of record design conditions published by ASHRAE.  If you don't have design conditions, then the fallback could be using the data in the weather files.  I have seen many weather files where the difference is 5 F or more -- which will radically affect auto-sizing.



On Fri, Jun 1, 2012 at 5:51 PM, Jason Kirkpatrick <jason.alan.kirkpatrick@xxxxxxxxx> wrote:
 

I think it would be easier to just use the SizingPeriod:WeatherFileDays object.

Also, for the Site:Location object, this gets overridden by EnergyPlus if it differs from the weather file anyway.





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