[EnergyPlus_Support] Re: theory behind SizingPeriod:DesignDay vs. SizingPeriod:WeatherFileDays

["Patricia" <patricia@xxxxxxxxxxxxxxxx>]

Drury, Linda, Thank you again!

So, from what you both are saying, the weather files just go back a few years (20 or so) and are termed 'typical'. 

For the most accurate sizing of equipment, one would rather have 'atypical' (more extreme) conditions so that these extremes can be accomodated by the system. (Use the DesignDay objects.)

Drury, thank you for offering to send me the references and papers that show how typical vs. actual weather files influence weather. I trust that you know what you're talking about. I'll take your word for it. Plus, I'm so busy. But THANK YOU!

It also sounds like SizingPeriod:WeatherFileDays and SizingPeriod:WeatherFileConditionType only need to be used if I want to use the weather files for sizing (which I don't now that I've read what you wrote). 

Again, thank you so much! Have a wonderful Friday and a nice weekend!

Sincerely, 
Patricia

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...> wrote:
>
> Weather files will not always have the conditions expressed by the 
> design conditions -- which are long term perspectives of a location.
> 
> You should also read about SizingPeriod:WeatherFileDays and 
> SizingPeriod:WeatherFileConditionType which use actual days out of 
> the weather file.  The requirement behind these two is two fold:
> 
> 1) you may not have design conditions for a location and wish to use 
> the precalculated days (extreme summar) as your sizing basis.
> 
> 2) you may wish to run a longer period than a day to get the sizing.
> 
> But the fact is that weather files don't necessarily represent the 
> extremes of the location and you may want those extremes represented 
> in your sizing.
> 
> Linda
>




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