Direct Normal Irradiance

This function computes the direct normal irradiance from the global horizontal and diffuse irradiance, if no direct normal irradiance is available.

Inputs

Direct Normal Irradiance Inputs

Outputs

Direct Normal Irradiance Outputs

Algorithm (Bird & Hulstrom Version)

Compute the direct normal irradiance only if GT > GD else set it to 0, as follows:

Direct Normal Irradiance Algo6