pvlib.bifacial.utils.vf_row_sky_2d_integ#
- pvlib.bifacial.utils.vf_row_sky_2d_integ(surface_tilt, gcr, x0=0, x1=1)[source]#
Calculate the average view factor to the sky from a segment of the row surface between x0 and x1.
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.
- Parameters
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]
x0 (numeric, default 0) – Position on the row’s slant length, as a fraction of the slant length. x0=0 corresponds to the bottom of the row. x0 should be less than x1. [unitless]
x1 (numeric, default 1) – Position on the row’s slant length, as a fraction of the slant length. x1 should be greater than x0. [unitless]
- Returns
vf (numeric) – Average fraction of the sky dome visible from points in the segment from x0 to x1. [unitless]