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Correct day angle in ASCE extraterrestrial irradiance model #712

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Merged
cwhanse merged 6 commits into from
May 8, 2019
Merged

Correct day angle in ASCE extraterrestrial irradiance model #712

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137114d
change day angle equation for asce model
cwhanse May 7, 2019
b217135
update whatsnew
cwhanse May 7, 2019
6172797
Merge branch 'master' of https://github.com/pvlib/pvlib-python into asce
cwhanse May 7, 2019
91d1d35
add reference
cwhanse May 7, 2019
12d0678
add offset kwarg to _calculate_simple_day_angle
cwhanse May 7, 2019
fe1cff1
add method kwarg to test
cwhanse May 7, 2019
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2 changes: 2 additions & 0 deletions docs/sphinx/source/whatsnew/v0.6.2.rst
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Expand Up @@ -46,6 +46,8 @@ Bug fixes
near horizon. (:issue:`656`)
* Fixed numpy warnings in :py:func:`~pvlib.tracking.singleaxis` when
comparing NaN values to limits. (:issue:`622`)
* Fixed a bug in the day angle equation for the ASCE
extraterrestrial irradiance model. (:issue:`211`)


Testing
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2 changes: 1 addition & 1 deletion pvlib/irradiance.py
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Expand Up @@ -88,7 +88,7 @@ def get_extra_radiation(datetime_or_doy, solar_constant=1366.1,
# consider putting asce and spencer methods in their own functions
method = method.lower()
if method == 'asce':
B = solarposition._calculate_simple_day_angle(to_doy(datetime_or_doy))
B = (2. * np.pi / 365.) * (to_doy(datetime_or_doy))
RoverR0sqrd = 1 + 0.033 * np.cos(B)
elif method == 'spencer':
B = solarposition._calculate_simple_day_angle(to_doy(datetime_or_doy))
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