feat: code documentation added

README.md

@@ -0,0 +1,32 @@
+# CERC PV Workflow
+
+## Introduction
+The CERC PV Workflow is designed to size and model different types of PV systems
+
+## System Requirements
+- **`Software Requirements`**: 
+Operating System: Windows, macOS, or Linux
+Python Version: 3.8 or higher
+
+
+- **`Python Dependencies`**:
+The application requires several Python libraries. These can be installed using the following command:
+```bash
+pip install -r requirements.txt
+```
+
+Ensure you have the required database drivers installed (e.g., psycopg2 for PostgreSQL, mysql-connector-python for MySQL).
+
+## Application Setup
+- **`Clone or Download the Project`**: 
+Start by downloading or cloning the project repository into your local system:
+```bash
+git clone https://ngci.encs.concordia.ca/gitea/s_ranjbar/pv_workflow.git
+```
+
+## Workflow Applications
+- **`Solar Angles Calculation`**:
+- **`Solar Radiation on Tilted Surfaces`**:
+- **`PV system assessment`**: 
+
+

example_codes/pv_system_assessment.py

@@ -77,7 +77,8 @@ for building in city.buildings:
                      system_catalogue_handler=None,
                      roof_percentage_coverage=0.75,
                      facade_coverage_percentage=0,
-                     csv_output=False,
+                     csv_output=True,
                      output_path=pv_assessment_path).enrich()
 
 
+

pv_assessment/pv_system_assessment.py

@@ -7,20 +7,51 @@ from hub.helpers.monthly_values import MonthlyValues
 
 
 class PvSystemAssessment:
+  """
+  A class to assess and size photovoltaic (PV) systems for buildings.
+
+  This class provides methods for sizing PV systems on rooftops, calculating their energy output,
+  assigning system components from a catalog, and evaluating grid-tied systems. It also allows for
+  CSV output of system results.
+
+  Attributes:
+      building (Building): The building for which the PV system is being assessed.
+      pv_system (PvSystem): The photovoltaic system used in the assessment.
+      battery (EnergyStorageSystem): The energy storage system associated with the PV system, if any.
+      tilt_angle (float): The tilt angle of the PV system.
+      solar_angles (DataFrame): Solar angles used in simulation (e.g., solar altitude, azimuth).
+      pv_installation_type (str): Type of installation (e.g., rooftop, facade).
+      simulation_model_type (str): Type of simulation model (e.g., 'explicit').
+      module_model_name (str): Model name of the PV module being used.
+      inverter_efficiency (float): Efficiency of the inverter.
+      system_catalogue_handler (str): Handler for the PV system catalog.
+      roof_percentage_coverage (float): Percentage of the roof to be covered by PV panels.
+      facade_coverage_percentage (float): Percentage of the facade to be covered by PV panels.
+      csv_output (bool): Whether or not to generate CSV output of the results.
+      output_path (str): Path to store the output CSV file.
+      results (dict): Dictionary to store the results of the system assessment.
+  """
   def __init__(self, building=None, pv_system=None, battery=None, tilt_angle=None, solar_angles=None,
                pv_installation_type=None, simulation_model_type=None, module_model_name=None,
                inverter_efficiency=None, system_catalogue_handler=None, roof_percentage_coverage=None,
                facade_coverage_percentage=None, csv_output=False, output_path=None):
     """
-    :param building:
+    Initializes the PvSystemAssessment instance with the provided parameters or defaults.
-    :param tilt_angle:
+
-    :param solar_angles:
+    :param building: The building object for which the PV system is assessed.
-    :param simulation_model_type:
+    :param pv_system: The photovoltaic system (optional, defaults to building's existing PV system).
-    :param module_model_name:
+    :param battery: The battery storage system (optional, defaults to building's associated storage).
-    :param inverter_efficiency:
+    :param tilt_angle: Tilt angle of the PV system.
-    :param system_catalogue_handler:
+    :param solar_angles: DataFrame containing solar angles (e.g., solar altitude, azimuth).
-    :param roof_percentage_coverage:
+    :param pv_installation_type: Type of installation ('rooftop', 'facade', etc.).
-    :param facade_coverage_percentage:
+    :param simulation_model_type: Type of simulation model ('explicit').
+    :param module_model_name: Model name of the PV module.
+    :param inverter_efficiency: Efficiency of the inverter.
+    :param system_catalogue_handler: Catalog handler to select PV module from a catalog.
+    :param roof_percentage_coverage: Percentage of roof to cover with PV modules.
+    :param facade_coverage_percentage: Percentage of facade to cover with PV modules.
+    :param csv_output: Boolean indicating whether to generate CSV output.
+    :param output_path: Path for saving the CSV output.
     """
     self.building = building
     self.tilt_angle = tilt_angle
@@ -56,6 +87,16 @@ class PvSystemAssessment:
 
   @staticmethod
   def explicit_model(pv_system, inverter_efficiency, number_of_panels, irradiance, outdoor_temperature):
+    """
+    Calculates the PV system's energy output using the explicit model.
+
+    :param pv_system: The photovoltaic system.
+    :param inverter_efficiency: Efficiency of the inverter.
+    :param number_of_panels: Number of PV panels in the system.
+    :param irradiance: Hourly irradiance values.
+    :param outdoor_temperature: Hourly outdoor temperature values.
+    :return: List of energy outputs for each hour.
+    """
     inverter_efficiency = inverter_efficiency
     stc_power = float(pv_system.standard_test_condition_maximum_power)
     stc_irradiance = float(pv_system.standard_test_condition_radiation)
@@ -78,6 +119,11 @@ class PvSystemAssessment:
     return pv_output
 
   def rooftop_sizing(self):
+    """
+    Sizing of the rooftop PV system.
+
+    :return: Number of panels per row and number of rows to be installed.
+    """
     pv_system = self.pv_system
     if self.module_model_name is not None:
       self.system_assignation()
@@ -109,6 +155,11 @@ class PvSystemAssessment:
     return panels_per_row, number_of_rows
 
   def system_assignation(self):
+    """
+    Assigns a PV system from the energy systems catalog based on the module model name.
+
+    :raises ValueError: If no PV module with the provided model name exists in the catalog.
+    """
     generation_units_catalogue = EnergySystemsCatalogFactory(self.system_catalogue_handler).catalog
     catalog_pv_generation_equipments = [component for component in
                                         generation_units_catalogue.entries('generation_equipments') if
@@ -133,6 +184,13 @@ class PvSystemAssessment:
           energy_system.generation_systems[idx] = new_system
 
   def grid_tied_system(self):
+    """
+    Evaluates the performance and sizing of a grid-tied PV system.
+
+    This method assesses energy production, storage, and demand matching for a grid-tied PV system.
+
+    :return: The evaluation results as a dictionary.
+    """
     building_hourly_electricity_demand = [demand / cte.WATTS_HOUR_TO_JULES for demand in
                                           HourlyElectricityDemand(self.building).calculate()]
     rooftop_pv_output = [0] * 8760

pv_assessment/solar_calculator.py

@@ -1,3 +1,9 @@
+"""
+solar_calculator module
+SPDX-License-Identifier: LGPL-3.0-or-later
+Copyright © 2022 Concordia CERC group
+Project Coder: Saeed Ranjbar saeed.ranjbar@cerc.com
+"""
 import math
 import pandas as pd
 from datetime import datetime
@@ -6,20 +12,21 @@ from hub.helpers.monthly_values import MonthlyValues
 
 
 class SolarCalculator:
+  """
+  SolarCalculator class performs solar angle and irradiance calculations for a given city and tilt angles
+  """
   def __init__(self, city, tilt_angle, surface_azimuth_angle, standard_meridian=-75,
                solar_constant=1366.1, maximum_clearness_index=1, min_cos_zenith=0.065, maximum_zenith_angle=87):
     """
-    A class to calculate the solar angles and solar irradiance on a tilted surface in the City
+    Initialize SolarCalculator with city and solar panel configurations.
-    :param city: An object from the City class -> City
+    :param city: City object containing latitude and longitude
-    :param tilt_angle: tilt angle of surface -> float
+    :param tilt_angle: Tilt angle of the solar panel in degrees
-    :param surface_azimuth_angle: The orientation of the surface. 0 is North -> float
+    :param surface_azimuth_angle: Azimuth angle of the solar panel in degrees
-    :param standard_meridian: A standard meridian is the meridian whose mean solar time is the basis of the time of day
+    :param standard_meridian: Standard meridian for time zone correction
-    observed in a time zone -> float
+    :param solar_constant: Extraterrestrial radiation constant in W/m2
-    :param solar_constant: The amount of energy received by a given area one astronomical unit away from the Sun. It is
+    :param maximum_clearness_index: Maximum clearness index for calculation
-    constant and must not be changed
+    :param min_cos_zenith: Minimum cosine zenith value
-    :param maximum_clearness_index: This is used to calculate the diffuse fraction of the solar irradiance -> float
+    :param maximum_zenith_angle: Maximum allowable zenith angle in degrees
-    :param min_cos_zenith: This is needed to avoid unrealistic values in tilted irradiance calculations -> float
-    :param maximum_zenith_angle: This is needed to avoid negative values in tilted irradiance calculations -> float
     """
     self.city = city
     self.location_latitude = city.latitude
@@ -52,6 +59,12 @@ class SolarCalculator:
     self.day_of_year = self.solar_angles.index.dayofyear
 
   def solar_time(self, datetime_val, day_of_year):
+    """
+    Calculate apparent solar time for a given datetime and day of the year.
+    :param datetime_val: Input datetime value
+    :param day_of_year: Day of the year (1-365)
+    :return: Apparent solar time (datetime)
+    """
     b = (day_of_year - 81) * 2 * math.pi / 364
     eot = 9.87 * math.sin(2 * b) - 7.53 * math.cos(b) - 1.5 * math.sin(b)
     self.eot.append(eot)
@@ -79,18 +92,42 @@ class SolarCalculator:
     return ast_time
 
   def declination_angle(self, day_of_year):
+    """
+    Calculate the solar declination angle for a given day of the year.
+    :param day_of_year: Day of the year (1-365)
+    :return: Declination angle in radians
+    """
     declination = 23.45 * math.sin(math.radians(360 / 365 * (284 + day_of_year)))
     declination_radian = math.radians(declination)
     self.declinations.append(declination)
     return declination_radian
 
   def hour_angle(self, ast_time):
+    """
+    Calculate the hour angle for a given apparent solar time (AST).
+
+    The hour angle is a measure of time since solar noon in degrees or radians,
+    where solar noon corresponds to 0°. It is negative in the morning and positive in the afternoon.
+
+    :param ast_time: Apparent solar time as a datetime object.
+    :return: Hour angle in radians.
+    """
     hour_angle = ((ast_time.hour * 60 + ast_time.minute) - 720) / 4
     hour_angle_radian = math.radians(hour_angle)
     self.hour_angles.append(hour_angle)
     return hour_angle_radian
 
   def solar_altitude(self, declination_radian, hour_angle_radian):
+    """
+    Calculate the solar altitude angle in radians for a given declination and hour angle.
+
+    The solar altitude angle is the angle between the sun's rays and the horizontal plane
+    at a given location and time. It indicates the sun's height in the sky.
+
+    :param declination_radian: Solar declination angle in radians.
+    :param hour_angle_radian: Hour angle in radians.
+    :return: Solar altitude angle in radians.
+    """
     solar_altitude_radians = math.asin(math.cos(self.location_latitude_rad) * math.cos(declination_radian) *
                                        math.cos(hour_angle_radian) + math.sin(self.location_latitude_rad) *
                                        math.sin(declination_radian))
@@ -99,6 +136,16 @@ class SolarCalculator:
     return solar_altitude_radians
 
   def zenith(self, solar_altitude_radians):
+    """
+    Calculate the solar zenith angle in radians from the solar altitude angle.
+
+    The solar zenith angle is the angle between the vertical direction
+    (directly overhead) and the line to the sun. It is complementary to
+    the solar altitude angle.
+
+    :param solar_altitude_radians: Solar altitude angle in radians.
+    :return: Solar zenith angle in radians.
+    """
     solar_altitude = math.degrees(solar_altitude_radians)
     zenith_degree = 90 - solar_altitude
     zenith_radian = math.radians(zenith_degree)
@@ -106,6 +153,21 @@ class SolarCalculator:
     return zenith_radian
 
   def solar_azimuth_analytical(self, hourangle, declination, zenith):
+    """
+    Calculate the solar azimuth angle analytically in radians.
+
+    The solar azimuth angle represents the sun's position relative to true north,
+    measured clockwise. The method uses the hour angle, solar declination, and
+    solar zenith to compute the azimuth.
+
+    :param hourangle: Hour angle of the sun in radians, indicating its position
+                      relative to the solar noon.
+    :param declination: Solar declination angle in radians, which is the angle
+                        between the sun's rays and the plane of Earth's equator.
+    :param zenith: Solar zenith angle in radians, the angle between the vertical
+                   direction and the sun's position.
+    :return: Solar azimuth angle in radians.
+    """
     numer = (math.cos(zenith) * math.sin(self.location_latitude_rad) - math.sin(declination))
     denom = (math.sin(zenith) * math.cos(self.location_latitude_rad))
     if math.isclose(denom, 0.0, abs_tol=1e-8):
@@ -122,6 +184,19 @@ class SolarCalculator:
     return solar_azimuth_radians
 
   def incident_angle(self, solar_altitude_radians, solar_azimuth_radians):
+    """
+    Calculate the solar incident angle in radians.
+
+    The incident angle represents the angle between the solar rays and the
+    normal to a tilted surface. It is a critical parameter for evaluating
+    the performance of solar panels.
+
+    :param solar_altitude_radians: Solar altitude angle in radians, indicating
+                                    the sun's position above the horizon.
+    :param solar_azimuth_radians: Solar azimuth angle in radians, specifying
+                                   the sun's position relative to true north.
+    :return: Solar incident angle in radians.
+    """
     incident_radian = math.acos(math.cos(solar_altitude_radians) *
                                 math.cos(abs(solar_azimuth_radians - self.surface_azimuth_rad)) *
                                 math.sin(self.tilt_angle_rad) + math.sin(solar_altitude_radians) *
@@ -131,6 +206,15 @@ class SolarCalculator:
     return incident_radian
 
   def dni_extra(self, day_of_year, zenith_radian):
+    """
+    Calculate extraterrestrial DNI and horizontal irradiance.
+
+    :param day_of_year: Day of the year (1–365/366).
+    :param zenith_radian: Solar zenith angle in radians.
+    :return: Tuple (i_on, i_oh) where:
+             - i_on: Extraterrestrial normal irradiance [W/m²].
+             - i_oh: Extraterrestrial horizontal irradiance [W/m²].
+    """
     i_on = self.solar_constant * (1 + 0.033 * math.cos(math.radians(360 * day_of_year / 365)))
     i_oh = i_on * max(math.cos(zenith_radian), self.min_cos_zenith)
     self.i_on.append(i_on)
@@ -138,12 +222,26 @@ class SolarCalculator:
     return i_on, i_oh
 
   def clearness_index(self, ghi, i_oh):
+    """
+    Calculate the clearness index (Kt).
+
+    :param ghi: Global horizontal irradiance [W/m²].
+    :param i_oh: Extraterrestrial horizontal irradiance [W/m²].
+    :return: Clearness index (Kt).
+    """
     k_t = ghi / i_oh
     k_t = max(0, k_t)
     k_t = min(self.maximum_clearness_index, k_t)
     return k_t
 
   def diffuse_fraction(self, k_t, zenith):
+    """
+    Estimate the diffuse fraction of irradiance.
+
+    :param k_t: Clearness index (Kt).
+    :param zenith: Solar zenith angle in degrees.
+    :return: Diffuse fraction.
+    """
     if k_t <= 0.22:
       fraction_diffuse = 1 - 0.09 * k_t
     elif k_t <= 0.8:
@@ -155,6 +253,14 @@ class SolarCalculator:
     return fraction_diffuse
 
   def radiation_components_horizontal(self, ghi, fraction_diffuse, zenith):
+    """
+    Compute diffuse and beam components of horizontal radiation.
+
+    :param ghi: Global horizontal irradiance [W/m²].
+    :param fraction_diffuse: Diffuse fraction.
+    :param zenith: Solar zenith angle in degrees.
+    :return: Tuple (diffuse_horizontal, dni).
+    """
     diffuse_horizontal = ghi * fraction_diffuse
     dni = (ghi - diffuse_horizontal) / math.cos(math.radians(zenith))
     if zenith > self.maximum_zenith_angle or dni < 0:
@@ -162,6 +268,14 @@ class SolarCalculator:
     return diffuse_horizontal, dni
 
   def radiation_components_tilted(self, diffuse_horizontal, dni, incident_angle):
+    """
+    Compute total radiation on a tilted surface.
+
+    :param diffuse_horizontal: Diffuse horizontal irradiance [W/m²].
+    :param dni: Direct normal irradiance [W/m²].
+    :param incident_angle: Solar incident angle in degrees.
+    :return: Total radiation on tilted surface [W/m²].
+    """
     beam_tilted = dni * math.cos(math.radians(incident_angle))
     beam_tilted = max(beam_tilted, 0)
     diffuse_tilted = diffuse_horizontal * ((1 + math.cos(math.radians(self.tilt_angle))) / 2)