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[EnergyPlus_Support] Re: Weather data

I Drury,
how can I calculate direct normal radiation from global horizontal and
diffuse horizontal radiations? I think that direct normal radiation is
measured over a surface perpendicular to solar rays and so I can't
obtain it with a subtraction.
thank you.

Tonia


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Crawley, Drury"
<Drury.Crawley@...> wrote:
>
> You need direct normal solar radiation but that can be calculated
from the global and diffuse.  Do you have wind direction?  The
WeatherConverter can convert most formats to EPW format.  Read about
it in the Auxiliary Programs Document.
> 
> ________________________________
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of antonia.labianca
> Sent: Tuesday, February 12, 2008 4:14 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Weather data
> 
> 
> 
> Hi,
> My weather file contains only hourly values of:
> � Air Temperature 
> � Relative Humidity 
> � Global Solar Radiation 
> � Diffuse Horizontal Solar Radiation 
> � Wind speed 
> Are they sufficient to run a building simulation?
> 
> 
> 
>  
> 
> 
> [Non-text portions of this message have been removed]
>




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