[EnergyPlus_Support] Re: Problem with ISHRAE weather data

["Paul Reeves" <paulreeves5@xxxxxxxxx>]

--- 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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