pvlib.bifacial.utils.vf_row_sky_2d(surface_tilt, gcr, x)[source]#

Calculate the view factor to the sky from a point x on a row surface.

Assumes a PV system of infinitely long rows with uniform pitch on horizontal ground. The view to the sky is restricted by the row’s surface tilt and the top of the adjacent row.

  • surface_tilt (numeric) – Surface tilt angle in degrees from horizontal, e.g., surface facing up = 0, surface facing horizon = 90. [degree]

  • gcr (numeric) – Ratio of the row slant length to the row spacing (pitch). [unitless]

  • x (numeric) – Position on the row’s slant length, as a fraction of the slant length. x=0 corresponds to the bottom of the row. [unitless]


vf (numeric) – Fraction of the sky dome visible from the point x. [unitless]