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Re: [EnergyPlus_Support] Re: Problem with ISHRAE weather data
We have determine that the ISHRAE source data were not in
TMY2 format. This did make the direct and diffuse solar values
incorrect. We have determined what the correct units are
and will be posting new .EPWs in the next day or so.
(Watch this email list for an update.)
Dru Crawley
"Paul Reeves"
<paulreeves5@xxxxxxxxx> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent by: cc:
EnergyPlus_Support@yaho Subject: [EnergyPlus_Support] Re: Problem with ISHRAE
ogroups.com weather data
01/30/2006 10:48 PM
Please respond to
EnergyPlus_Support
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@l...>
wrote:
>
> We have not heard this about ISHRAE weather data.
>
> How did you determine they are 3X larger than possible? (i.e.,
what
> are you using to determine "max possible"?)
>
>
> Linda
>
Linda,
I arrived at the "3X larger than possible" observation based on the
assumption that the solar data is for planet Earth and that we still
have some atmosphere.
Sorry, I couldn't resist that one. But really, if you look at any of
the ISHRAE data sets (or at least most), you'll notice that the ET
direct normal solar radiation is on the order of 5000 Wh/m2 whenever
the sun is "up". The terrestrial direct normal solar radiation
values are often above 3000 Wh/m2, or appoximately 3 times what is
possible here.
To be honest, I haven't used the EPW data sets very much, so I might
be missing something, but all the other data sets I've looked at make
sense.
Paul
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