Re: [EnergyPlus_Support] Help about global horizzontal radiation

[Linda Lawrie <linda@xxxxxxxxxx>]

At 02:24 AM 12/7/2005, dademarino wrote:
>-I have measured the global horizontal radiation with a measure
>instrument and I would have to insert it in EPW weather file
>(PALERMO-PUNTARAISI).  In the handbook of energyplus it is written
>that such data still is not used for the calculations. I have
>thought that I could divide global horizontal radiation in direct
>normal radiation and diffuse horizzontal radiation. In this way I
>replace these values in EPW weather file.
>Is it correct?Can someone help me?

1) Global Horizontal radiation is not used directly in any of the 
EnergyPlus calculations.

2) You can use Global horizontal to derive direct normal and diffuse 
horizontal but you would also need some other indications of the sky 
than just the value for global horizontal.  (i.e. global and diffuse, 
global and direct normal or horizontal, global and sky conditions -- 
along with angle of the sun for hour of the day).


Linda

EnergyPlus WebSite: http://www.energyplus.gov
Owner: EnergyPlus_Support list
Member: EnergyPlus Development Team



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