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[EnergyPlus_Support] RE: Calculating direct normal and diffuse horizontal radiation form global horizontal radiation



Dear Linda,


I was reading carefully the auxiliary programs document but I din't understand how to do it. As a custom file or should I entered measured values in existing epw and translate it again? Or maybe something completely different?



---In energyplus_support@xxxxxxxxxxxxxxx, <linda@...> wrote:

The EnergyPlus Weather Converter will do this.  Documented in the Auxiliary Programs document.

It uses the Perez direct/diffuse split algorithm.

I am trying to calibrate energyplus model for my research and I obtained some weather data from local Meteo station. Most of the parameters are being measured at the building itself, but radiation is taken from nearby official meteo station. In meteo station only global horizontal radiation is being measured. When I converted epw file for my city  to csv I saw that there are 3 columns about radiation: global horizontal (already have), direct normal and diffuse horizontal. I know I need some additional info in order to obtain the last two, but I do not know which (I assume it is the cloud cover). The station does not have perheliometer for diffuse radiation measurement. Are there any software for calculating various radiation components from known global horizontal radiation?


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