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[FIX] iam.physical returns nan for aoi > 90° when n = 1 (#1706) #1707

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merged 5 commits into from
Jun 20, 2023
Merged

[FIX] iam.physical returns nan for aoi > 90° when n = 1 (#1706) #1707

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ef8be37
[FIX] iam.physical returns nan for aoi > 90° when n = 1 (#1706)
kdebrab Mar 24, 2023
cc4f146
address stickler-ci and codecov alerts
kdebrab Mar 24, 2023
d25bd47
Merge remote-tracking branch 'upstream/main' into pr/1707
kandersolar Jun 12, 2023
0cc34aa
suppress obnoxious numpy warnings
kandersolar Jun 12, 2023
d03704c
whatsnew
kandersolar Jun 12, 2023
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7 changes: 7 additions & 0 deletions pvlib/iam.py
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Original file line number Diff line number Diff line change
Expand Up @@ -215,6 +215,13 @@ def physical(aoi, n=1.526, K=4.0, L=0.002, *, n_ar=None):
# incidence angle modifier
iam = (tau_s + tau_p) / 2 / tau_0

# for light coming from behind the plane, none can enter the module
# when n2 > 1, this is already the case
if np.isclose(n2, 1).any():
iam = np.where(aoi >= 90, 0, iam)
if isinstance(aoi, pd.Series):
iam = pd.Series(iam, index=aoi.index)

return iam


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12 changes: 12 additions & 0 deletions pvlib/tests/test_iam.py
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Expand Up @@ -51,6 +51,18 @@ def test_physical():
assert_series_equal(iam, expected)


def test_physical_n1_L0():
aoi = np.array([0, 22.5, 45, 67.5, 90, 100, np.nan])
expected = np.array([1, 1, 1, 1, 0, 0, np.nan])
iam = _iam.physical(aoi, n=1, L=0)
assert_allclose(iam, expected, equal_nan=True)

aoi = pd.Series(aoi)
expected = pd.Series(expected)
iam = _iam.physical(aoi, n=1, L=0)
assert_series_equal(iam, expected)


def test_physical_ar():
aoi = np.array([0, 22.5, 45, 67.5, 90, 100, np.nan])
expected = np.array([1, 0.99944171, 0.9917463, 0.91506158, 0, 0, np.nan])
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