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

Hold on, hold on.

No, I did not mean to say that I want to set the design day based on the weather of the weather file. I meant to say I want to set the DesignDay based on the Site.Location, that is defined in the Weather file.

If I want to run one simulation for several locations around the world, I have to define the DesignDay conditions appropriate to each location, just the way ASHRAE says we should and the way the DDY files do.

My problem, is that I want to **Automate** the definition of the design day with a macro, taking the ASHRAE DesignDay conditions according to the weather file I'm using in the simulation.

I would like my macro to say something like this:
##if Site = 55386     !Chicago. This comes from the weather file
  DesingDay,MaxTemp = 38,
  DesignDay,MaxDeltaT = 8,
##elseif Site = 78234 ! Mumbai. This comes from the weather file
  DesignDay,MaxTemp = 46,
  DesignDay,MaxDeltaT = 4,
....
##endif

Can this be done with an E+ macro? Can jEplus do this?

Thanks.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Dru Crawley <dbcrawley@...> 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@...> 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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