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The Radiation Model Dialog Box (With Solar Load Model DO Irradiation Option)
2. Define the solar parameters.
(a) Enter values for the X, Y, and Z components of the Sun Direction Vector. Alternatively, you can
choose to have this vector computed from the solar calculator by enabling the Use Direction
Computed from Solar Calculator option.

(b) Specify the illumination parameters.
1. Enter a value for Direct Solar Irradiation under Illumination Parameters. This parameter is the
amount of energy per unit area in W/m2 due to direct solar irradiation. This value may depend on
the time of year and the clearness of the sky. Make your selection in the drop-down list next to Direct
Solar Irradiation and either enter a constant value, have the value computed from the solar
calculator, or specify it using a user-defined function. For transient simulations, you have the
additional option of specifying a time-dependent piecewise-linear and polynomial profile for direct
solar irradiation.

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