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[EnergyPlus_Support] Re: weather file radiation
sure I'd like to see the IWEC document. Please send it to my yahoo
address: edhugar@xxxxxxxxx , it's supposed to receive up to 5MB
thanks
hector
___________________________________________________
Ing. Héctor E Huerta Garza
ITESM-Posgrado
Tel: (+52 81) 83 58 00 73
e-mail:
A00603447@xxxxxxxx
edhugar@xxxxxxxxxxx
edhugar@xxxxxxxxx
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Drury.Crawley@e... wrote:
>
> NREL is currently updating their solar model as part of creating
> a new 30-year (1971-2000) data set for the US of 230+ locations.
> We (EnergyPlus development team) are monitoring that work. If
> it appears to solve many of the problems we've run into with solar,
> we may add solar calculation to the weather converter. Right now
> none of the solar calculation algorithms do a good job once you're
> below the tropic lines....
>
> If you would like a copy of the IWEC report--which describes the
> evaluation of various solar models against measured solar, let
> me know. It's too large to send through the Yahoo_group.
>
> Dru
>
>
>
>
> "Hector
Huerta
> <edhugar@y... To:
EnergyPlus_Support@xxxxxxxxxxxxxxx
> m>" <edhugar
cc:
> Subject:
[EnergyPlus_Support] Re: weather file radiation
> 02/06/2003
12:50
>
PM
> Please respond
to
>
EnergyPlus_Suppor
>
t
>
>
>
>
>
>
> hello Ned
>
> yeah you're right, the excel program doesn't account for cloud
cover
> corrections, something I'll have to figure out...seems like I could
> get sky clearness factors (1-10, 10 full covered), do you think I
> should aply those directly as a percentage of the global radiation(
> ed. 8/10, 9/10). or should that affect only either the duffuse or
> direct components?...
>
> but .. yes.. that could still be a mere approximation as you well
> point out
>
> as for the model used itself I searched and found this url
> http://www.nrel.gov/docs/legosti/old/761.pdf as referenced by the
> author of the excel file.
>
> best regards
>
> hector huerta
> edhugar@y...
> A00603447@i...
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Edward Lyon"
> <eglyon@s...> wrote:
> > The problem with these calculations for energy modeling is that
> they give you a perfect clear day solar value for any time period
> you calculate. If you had additional sky weather data for cloud
> cover, you could try to apply some cloud cover corrections.
> However, correcting the solar data with a cloud cover algorithm is
> still not as good as measured solar data, it can be as much as 50%
> off. I know these cloud algorithms have been applied to some of
the
> canned weather files we use that do not have direct solar
> measurements, but I have not seen the source equations yet.
> >
> > Ned Lyon
> >
> > Senior Staff Engineer
> > Simpson Gumpertz & Heger Inc.
> >
> > 41 Seyon Street
> > Building #1, Suite 500
> > Waltham, MA 02453
> >
> > Phone: 781-907-9000
> > Fax: 781-907-9009
> >
> >
> > >>> edhugar@y... 02/06/03 11:28AM >>>
>
>
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