Re: [EnergyPlus_Support] SolarRadiation

[Linda Lawrie <linda@xxxxxxxxxx>]

At 10:32 AM 12/3/2002, Alexander Beisteiner wrote:
> Looking
> at the variable report of the direct and diffuse solar radiation, I found
> that the period of solar radiation is steadily reduced in the variable
> report. In other words, my weather file specifies a direct and diffuse
> radiation for the period 5:00 to 19:00 each day. In the variable report
> that period is reduced to 6:00 to 19:00 after about 8 month of simulation
> and further to 7:00 to 17:00 after 10 month and finally to 9:00 to 16:00
> after 11 month. I wonder if the source code uses these truncated periods
> of radiation or the original from the weather file.

Without seeing your weather file and your idf, I can only guess.  Even if diffuse and direct are put in the weather file, EnergyPlus does an internal calculation (based on several factors including latitude, longitude, etc) to determine when the sun is up.  When the sun is not up, it resets any values for diffuse and direct to 0.0

In V1.0.3:

a)  Solar interpolation has changed (hopefully for the better)

b)  you will be able to report out the solar altitude, azimuth and hour angle

Linda

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