8000 Rename `tilt` to `surface_tilt` in `soiling.hsu` by kandersolar · Pull Request #1738 · pvlib/pvlib-python · GitHub
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Rename tilt to surface_tilt in soiling.hsu #1738

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Merged
merged 3 commits into from
May 24, 2023
Merged

Rename tilt to surface_tilt in soiling.hsu #1738

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22e5dd0
tilt -> surface_tilt
kandersolar May 16, 2023
e57f197
whatsnew
kandersolar May 16, 2023
821bdae
document surface_tilt as numeric, not float
kandersolar May 16, 2023
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tilt -> surface_tilt
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@kandersolar
kandersolar committed May 16, 2023
commit 22e5dd0c5567604122e7e70dbe00836a91fe90c6
6 changes: 3 additions & 3 deletions pvlib/soiling.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
from pvlib.tools import cosd


def hsu(rainfall, cleaning_threshold, tilt, pm2_5, pm10,
def hsu(rainfall, cleaning_threshold, surface_tilt, pm2_5, pm10,
depo_veloc=None, rain_accum_period=pd.Timedelta('1h')):
"""
Calculates soiling ratio given particulate and rain data using the
Expand All @@ -30,7 +30,7 @@ def hsu(rainfall, cleaning_threshold, tilt, pm2_5, pm10,
Amount of rain in an accumulation period needed to clean the PV
modules. [mm]

tilt : float
surface_tilt : float
Tilt of the PV panels from horizontal. [degree]

pm2_5 : numeric
Expand Down Expand Up @@ -83,7 +83,7 @@ def hsu(rainfall, cleaning_threshold, tilt, pm2_5, pm10,
horiz_mass_rate = (
pm2_5 * depo_veloc['2_5'] + np.maximum(pm10 - pm2_5, 0.)
* depo_veloc['10']) * dt_sec
tilted_mass_rate = horiz_mass_rate * cosd(tilt) # assuming no rain
tilted_mass_rate = horiz_mass_rate * cosd(surface_tilt) # assuming no rain

# tms -> tilt_mass_rate
tms_cumsum = np.cumsum(tilted_mass_rate * np.ones(rainfall.shape))
Expand Down
10 changes: 5 additions & 5 deletions pvlib/tests/test_soiling.py
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Expand Up @@ -92,7 +92,7 @@ def test_hsu_no_cleaning(rainfall_input, expected_output):
tilt = 0.
expected_no_cleaning = expected_output

result = hsu(rainfall=rainfall, cleaning_threshold=10., tilt=tilt,
result = hsu(rainfall=rainfall, cleaning_threshold=10., surface_tilt=tilt,
pm2_5=pm2_5, pm10=pm10, depo_veloc=depo_veloc,
rain_accum_period=pd.Timedelta('1h'))
assert_series_equal(result, expected_no_cleaning)
Expand All @@ -108,7 +108,7 @@ def test_hsu(rainfall_input, expected_output_2):
tilt = 0.

# three cleaning events at 4:00-6:00, 8:00-11:00, and 17:00-20:00
result = hsu(rainfall=rainfall, cleaning_threshold=0.5, tilt=tilt,
result = hsu(rainfall=rainfall, cleaning_threshold=0.5, surface_tilt=tilt,
pm2_5=pm2_5, pm10=pm10, depo_veloc=depo_veloc,
rain_accum_period=pd.Timedelta('3h'))

Expand All @@ -120,8 +120,8 @@ def test_hsu_defaults(rainfall_input, expected_output_1):
Test Soiling HSU function with default deposition velocity and default rain
accumulation period.
"""
result = hsu(rainfall=rainfall_input, cleaning_threshold=0.5, tilt=0.0,
pm2_5=1.0e-2, pm10=2.0e-2)
result = hsu(rainfall=rainfall_input, cleaning_threshold=0.5,
surface_tilt=0.0, pm2_5=1.0e-2, pm10=2.0e-2)
assert np.allclose(result.values, expected_output_1)


Expand All @@ -138,7 +138,7 @@ def test_hsu_variable_time_intervals(rainfall_input, expected_output_3):
rain['new_time'] = rain.index + rain['mins_added']
rain_var_times = rain.set_index('new_time').iloc[:, 0]
result = hsu(
rainfall=rain_var_times, cleaning_threshold=0.5, tilt=50.0,
rainfall=rain_var_times, cleaning_threshold=0.5, surface_tilt=50.0,
pm2_5=1, pm10=2, depo_veloc=depo_veloc,
rain_accum_period=pd.Timedelta('2h'))
assert np.allclose(result, expected_output_3)
Expand Down
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