Add semi_integrated parameters for PVsyst temperature model (pvlib#2415)

* Enhanced the Software with Semi-Integration

* Enhancement Changes Updated

* cleanup

* whatsnew

* bit more cleanup

---------

Co-authored-by: Kevin Anderson <kevin.anderso@gmail.com>

Author: Muhammad-Rebaal

docs/sphinx/source/whatsnew/v0.12.1.rst

@@ -31,6 +31,8 @@ Enhancements
   :py:func:`~pvlib.iotools.read_nsrdb_psm4`. (:issue:`2326`, :pull:`2378`, :pull:`2445`)
 * :py:mod:`pvlib.bifacial.infinite_sheds` no longer emits "invalid value" warnings
   when supplying irradiance arrays with nighttime zero values. (:issue:`2450`, :pull:`2451`)
+* Add ``'semi_integrated'`` parameters for the PVsyst temperature model.
+  (:issue:`2330`, :pull:`2415`)
 
 Documentation
 ~~~~~~~~~~~~~
@@ -63,3 +65,4 @@ Contributors
 * Will Hobbs (:ghuser:`williamhobbs`)
 * Kevin Anderson (:ghuser:`kandersolar`)
 * Will Holmgren (:ghuser:`wholmgren`)
+* Muhammad Rebaal (:ghuser:`Muhammad-Rebaal`)

pvlib/pvsystem.py

@@ -1010,6 +1010,9 @@ def _infer_temperature_model_params(self):
         elif 'insulated' in param_set:  # after SAPM to avoid confusing keys
             return temperature._temperature_model_params('pvsyst',
                                                          'insulated')
+        elif 'semi_integrated' in param_set:
+            return temperature._temperature_model_params('pvsyst',
+                                                         'semi_integrated')
         else:
             return {}
 
@@ -1394,10 +1397,11 @@ class FixedMount(AbstractMount):
 
     racking_model : str, optional
         Valid strings are ``'open_rack'``, ``'close_mount'``,
-        ``'insulated_back'``, ``'freestanding'`` and ``'insulated'``.
+        ``'insulated_back'``, ``'freestanding'``, ``'insulated'``, and
+        ``'semi_integrated'``.
         Used to identify a parameter set for the SAPM or PVsyst cell
         temperature model.
-        See :py:func:`~pvlib.temperature.sapm_module`  and
+        See :py:func:`~pvlib.temperature.sapm_module` and
         :py:func:`~pvlib.temperature.pvsyst_cell` for definitions.
 
     module_height : float, optional
@@ -1475,7 +1479,8 @@ class SingleAxisTrackerMount(AbstractMount):
 
     racking_model : str, optional
         Valid strings are ``'open_rack'``, ``'close_mount'``,
-        ``'insulated_back'``, ``'freestanding'`` and ``'insulated'``.
+        ``'insulated_back'``, ``'freestanding'``, ``'insulated'``, and
+        ``'semi_integrated'``.
         Used to identify a parameter set for the SAPM or PVsyst cell
         temperature model. ``'open_rack'`` or ``'freestanding'`` should
         be used for systems with single-axis trackers.

pvlib/temperature.py

@@ -21,7 +21,8 @@
         'insulated_back_glass_polymer': {'a': -2.81, 'b': -.0455, 'deltaT': 0},
     },
     'pvsyst': {'freestanding': {'u_c': 29.0, 'u_v': 0},
-               'insulated': {'u_c': 15.0, 'u_v': 0}}
+               'insulated': {'u_c': 15.0, 'u_v': 0},
+               'semi_integrated': {'u_c': 20.0, 'u_v': 0}}
 }
 """Dictionary of temperature parameters organized by model.
 
@@ -382,19 +383,21 @@ def pvsyst_cell(poa_global, temp_air, wind_speed=1.0, u_c=29.0, u_v=0.0,
     air temperature :math:`T_{a}` (C) and wind speed :math:`WS` (m/s). Model
     output is cell temperature :math:`T_{C}`. Model parameters depend both on
     the module construction and its mounting. Parameters are provided in
-    [1]_ for open (freestanding) and close (insulated) mounting configurations,
-    , and are coded for convenience in
+    [1]_ for open (freestanding), close (insulated), and intermediate
+    (semi_integrated) mounting configurations, and are coded for convenience in
     :data:`~pvlib.temperature.TEMPERATURE_MODEL_PARAMETERS`. The heat loss
     factors provided represent the combined effect of convection, radiation and
     conduction, and their values are experimentally determined.
 
-    +--------------+---------------+---------------+
-    | Mounting     | :math:`U_{c}` | :math:`U_{v}` |
-    +==============+===============+===============+
-    | freestanding | 29.0          | 0.0           |
-    +--------------+---------------+---------------+
-    | insulated    | 15.0          | 0.0           |
-    +--------------+---------------+---------------+
+    +-----------------+---------------+---------------+
+    | Mounting        | :math:`U_{c}` | :math:`U_{v}` |
+    +=================+===============+===============+
+    | freestanding    | 29.0          | 0.0           |
+    +-----------------+---------------+---------------+
+    | insulated       | 15.0          | 0.0           |
+    +-----------------+---------------+---------------+
+    | semi_integrated | 20.0          | 0.0           |
+    +-----------------+---------------+---------------+
 
     Mounting cases can be described in terms of air flow across and around the
     rear-facing surface of the module:

tests/test_pvsystem.py

@@ -710,6 +710,13 @@ def test_Array__infer_temperature_model_params():
     expected = temperature.TEMPERATURE_MODEL_PARAMETERS[
         'pvsyst']['insulated']
     assert expected == array._infer_temperature_model_params()
+    array = pvsystem.Array(mount=FixedMount(0, 180,
+                                            racking_model='semi_integrated'),
+                           module_parameters={},
+                           module_type=None)
+    expected = temperature.TEMPERATURE_MODEL_PARAMETERS[
+        'pvsyst']['semi_integrated']
+    assert expected == array._infer_temperature_model_params()
 
 
 def test_Array__infer_cell_type():