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

[CleanTech Analytics <jeremiah@xxxxxxxxxxxxxxxxxxxxxx>]

 I think you would be best to do this with EP Macro because in Je+ it will change each unit for each file, so it would osculate each variable ( Je+ calls each variable a Job) times each Job is called it is ran aganst all jobs, so it creates expodential jobs each time another is added, thereby mixing up your values for jobs if you need to change more then one item per job so this would not work for DDY data. However Je+ does support EP Macro, so if you say had a few other parametrics to combine with weather files then Je+ could be useful to manage your parametrics.  Linda I believe provided what you need, as E+ Macro has many possibilities that I have not used, so can not comment (also looks like Jason provided the include prefix) I am also going to experiment with the DDY-Macro for climate studies myself and may post results..

 

Best regards 

Jeremiah D. Crossett

CleanTech Analytics

503-688-8951

www.cleantechanalytics.com

This document may contain valuable information proprietary to CleanTech Analytics which is private and confidential. It may not be shared, copied, stored or transmitted in any form without the prior written consent of CleanTech Analytics

On Fri, Jun 1, 2012 at 5:01 PM, hnoboam <homero.noboa@xxxxxxxxx> wrote:

 

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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