pvlib.irradiance.get_ground_diffuse#

pvlib.irradiance.get_ground_diffuse(surface_tilt, ghi, albedo=0.25, surface_type=None)[source]#

Estimate diffuse irradiance on a tilted surface from ground reflections.

Ground diffuse irradiance is calculated as

\[G_{ground} = GHI \times \rho \times \frac{1 - \cos\beta}{2}\]

where \(\rho\) is albedo and \(\beta\) is surface_tilt.

Parameters:

surface_tilt (numeric) – Panel tilt from horizontal. See surface_tilt. [°]
ghi (numeric) – Global horizontal irradiance. See ghi. [Wm⁻²]
albedo (numeric, default 0.25) – Ground surface albedo., typically 0.1-0.4 for bare or vegetated ground, may increase over snow, ice, etc. May also be known as the reflection coefficient. Must be >=0 and <=1. Will be overridden if surface_type is supplied. See albedo. [unitless]
surface_type (string, optional) – If supplied, overrides albedo. surface_type can be one of ‘urban’, ‘grass’, ‘fresh grass’, ‘snow’, ‘fresh snow’, ‘asphalt’, ‘concrete’, ‘aluminum’, ‘copper’, ‘fresh steel’, ‘dirty steel’, ‘sea’.

Returns:

grounddiffuse (numeric) – Ground reflected irradiance. [Wm⁻²]

Notes

Table of albedo values by surface_type are from [2], [3], [4]; see SURFACE_ALBEDOS.

References