Re: [EnergyPlus_Support] Re: create EPW weather file [1 Attachment]

["Linda Lawrie linda@xxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Your input global horizontal looks pretty suspect for months
after May.

See attached profile display from dview.

At 09:18 AM 6/2/2015, la.epfl@xxxxxxxxx [EnergyPlus_Support]
wrote:


> Hello everyone, 
>
> I was trying to make sense out of some file transformation I have made. I
> attach the CSV file, the def file I am using as well as the audit file of
> the conversion. 
>
> I would like to know if everything is fine in the process and clarify
> some topics. 
>
> The original data from the CSV file comes from a weather station
> measurment and I am automatically transcribing it in the CSV. I am mostly
> interested in having correct solar radiation interpolation. The station
> gives me a measurement for sun which I assume to be horizontal global
> radiation. Does that sound like a reasonable assumption or it might be
> something else ? I do not have so much information about the weather
> station it comes from wunderground.com data.
>
> Second, the audit file gives me warnings like:
> Warning ** DirectNormalRadiation   1076.0 > max
> theoretical=   690.6 Wh/mâ?¤ on date= 1/ 1 at hour=14
> Does that mean that my original data is not good and should I do
> something about it ?(I have checked latitude longitude, looks fine).
> Then when I look at the EPW file I have created, the direct normal
> radiation for this hour is not 1076 nor 690 but 829Wh/m2, which I don't
> really understand. 
>
> Finally, I was expecting the direct radiation to be greater than the
> horizontal global radiation, but that is not what happens in practice. Is
> that then false ?
>
> Any other advice concerning weather conversion and creating EPW based on
> measured data is welcome as well :)
>
> Thanks in advance,
>
> Best regards

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Posted by: Linda Lawrie <linda@xxxxxxxxxxxxxx>

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