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[EnergyPlus_Support] Extraterrestrial Horizontal Radiation Calculation



Hi,

I'm wondering how E+ calculate hourly Extraterrestrial Horizontal Radiation.

My calcualtion is based on "Duffie, J. A. and Beckman, W. A. 1991. Solar Engineering of Thermal Processes, 2nd edn. J. Wiley and Sons, New York".

I compared with the values in weather file and I found there is some differences (around 10%~20%).

Thanks,

Bing



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