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Aug 6, 2019
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edit DIRINDEX docstring #760

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cwhanse Aug 2, 2019
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10 changes: 6 additions & 4 deletions pvlib/irradiance.py
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Expand Up @@ -1742,11 +1742,13 @@ def dirindex(ghi, ghi_clearsky, dni_clearsky, zenith, times, pressure=101325.,
use_delta_kt_prime=True, temp_dew=None, min_cos_zenith=0.065,
max_zenith=87):
"""
Determine DNI from GHI using the DIRINDEX model, which is a modification of
the DIRINT model with information from a clear sky model.
Determine DNI from GHI using the DIRINDEX model.

DIRINDEX [1] improves upon the DIRINT model by taking into account
turbidity when used with the Ineichen clear sky model results.
The DIRINDEX model [1] modifies the DIRINT model implemented in
:py:func:``pvlib.irradiance.dirint`` by taking into account information
from a clear sky model. It is recommended that ``ghi_clearsky`` be
calculated using the Ineichen clear sky model
:py:func:``pvlib.clearsky.ineichen`` with ``perez_enhancement=True``.

The pvlib implementation limits the clearness index to 1.

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