Re: [EnergyPlus_Support] Daylighting Map: Strange dates & other related

[Linda Lawrie <linda@xxxxxxxxxx>]

You have to decide if designbuilder and EnergyPlus are indeed using 
the same weather data in your runs.  Since designbuilder results 
didn't change it would seem like maybe it reverted to the other 
weather data?  Not sure what results you can look at from 
designbuilder to tell you -- perhaps keeping your current location 
object and looking for an error file from designbuilder/energyplus run.

The other thing you could try is using the Cairo IWEC data instead -- 
that file has the correct time zone of 2 in its header.  Results from 
using that weather data should be very much the same between your 
designbuilder run and energyplus outside of design builder.

Linda

At 04:00 PM 8/4/2007, Abeer M. Eisa wrote:

>Thanks Linda,
>   Re the different value of time zone: I'm using designbuilder to 
> build the models and export idf to 
> energyplus,  designbuilder  internally uses the same energyplus 
> version, when I rectified the time zone in the weather file (; set 
> it to 2),  comparing the resulting sensible cooling/heating in 
> both: the results considerably differ between the two programs 
> (more evident in orientations preference; best and worst 
> orientations).. actually designbuilder results didn't change when 
> changing time zone in the weather file but energyplus results 
> considerably changed. (isn't this strange? as designbuilder uses 
> the same energyplus and its weather file???)
>   Should I upload the files for more inspection?
>   Waiting your replies with many thanks
>   Abeer
>
>Linda Lawrie <linda@xxxxxxxxxx> wrote:
>           At 11:19 AM 8/4/2007, Abeer M. Eisa wrote:
> > Thank you for your reply. The important question for me is How
> > far do these strange dates impact the accuracy of the values of 
> daylighting?
>
>These "strange dates" are a product of Excel's display, not
>EnergyPlus. The values of the daylighting -- you can look at the raw
>csv file and see that the Mon/Day is, for example, 1/13 though your
>excel file now says that is 1/1/2013.
>
> > I also found that although Time zone is set to 2 in the idf file,
> > in the resulting input data verification report; it's set 1 .. any
> > possible reason?
>
>Your location object
>Location,
>11-7, !- LocationName
>30.13, !- Latitude {deg}
>31.4, !- Longitude {deg}
>2, !- TimeZone {hr}
>74; !- Elevation {m}
>
>has set the time zone as +2, but the weather file has the time zone
>set at 1. If a weather file is attached, it automatically overrides
>the value of the Location object in the IDF.
>
>The warning in the .err file:
>** Warning ** Weather file location will be used rather than
>entered Location object.
>** ~~~ ** ..Location object=11-7
>** ~~~ ** ..Weather File Location=CAIRO INTL AIRPORT AL
>QAHIRAH EGY ETMY WMO#=623660
>
>tells you that but does not describe all the possible implications.
>
>Linda
>
>EnergyPlus WebSite: http://www.energyplus.gov
>Owner: EnergyPlus_Support list
>Member: EnergyPlus Development Team
>
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>
>
>
>
>
>
>Abeer M. Eisa
>Visiting Scholar
>School of Architecture
>University of Sheffield
>Western Bank
>Sheffield S10 2TN, UK
>tel. 0114 2220372 , Mob. 0789 44 69159
>
>
>
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