Re: [EnergyPlus_Support] Extraterrestrial Horizontal Radiation Calculation

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

EnergyPlus does not calculate nor does it use
Extraterrestrial Horizontal Radiation -- whatever is being reported is
coming directly from the weather files, if reported at all.

Are you talking about Horizontal IR from Sky?  The details of the
calculation, I believe, are in the Auxiliary Programs document as of V4
release.

At 08:02 AM 12/28/2009, Bing Dong wrote:
> 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%).

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