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

[Dru Crawley <dbcrawley@xxxxxxxxx>]

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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