147 lines
5.6 KiB
Python
147 lines
5.6 KiB
Python
import math
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import pandas as pd
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from datetime import datetime
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from pathlib import Path
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class CitySolarAngles:
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def __init__(self, file_name, location_latitude, location_longitude, tilt_angle, surface_azimuth_angle,
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standard_meridian=-75):
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self.file_name = file_name
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self.location_latitude = location_latitude
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self.location_longitude = location_longitude
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self.location_latitude_rad = math.radians(location_latitude)
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self.surface_azimuth_angle = surface_azimuth_angle
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self.surface_azimuth_rad = math.radians(surface_azimuth_angle)
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self.tilt_angle = tilt_angle
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self.tilt_angle_rad = math.radians(tilt_angle)
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self.standard_meridian = standard_meridian
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self.longitude_correction = (location_longitude - standard_meridian) * 4
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self.timezone = 'Etc/GMT+5'
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self.eot = []
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self.ast = []
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self.hour_angles = []
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self.declinations = []
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self.solar_altitudes = []
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self.solar_azimuths = []
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self.zeniths = []
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self.incidents = []
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self.beam_tilted = []
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self.factor = []
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self.times = pd.date_range(start='2023-01-01', end='2024-01-01', freq='H', tz=self.timezone)
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self.df = pd.DataFrame(index=self.times)
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self.day_of_year = self.df.index.dayofyear
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def solar_time(self, datetime_val, day_of_year):
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b = (day_of_year - 81) * 2 * math.pi / 364
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eot = 9.87 * math.sin(2 * b) - 7.53 * math.cos(b) - 1.5 * math.sin(b)
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self.eot.append(eot)
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# Calculate Local Solar Time (LST)
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lst_hour = datetime_val.hour
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lst_minute = datetime_val.minute
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lst_second = datetime_val.second
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lst = lst_hour + lst_minute / 60 + lst_second / 3600
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# Calculate Apparent Solar Time (AST) in decimal hours
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ast_decimal = lst + eot / 60 + self.longitude_correction / 60
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ast_hours = int(ast_decimal)
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ast_minutes = round((ast_decimal - ast_hours) * 60)
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# Ensure ast_minutes is within valid range
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if ast_minutes == 60:
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ast_hours += 1
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ast_minutes = 0
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elif ast_minutes < 0:
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ast_minutes = 0
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ast_time = datetime(year=datetime_val.year, month=datetime_val.month, day=datetime_val.day,
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hour=ast_hours, minute=ast_minutes)
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self.ast.append(ast_time)
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return ast_time
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def declination_angle(self, day_of_year):
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declination = 23.45 * math.sin(math.radians(360 / 365 * (284 + day_of_year)))
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declination_radian = math.radians(declination)
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self.declinations.append(declination)
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return declination_radian
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def hour_angle(self, ast_time):
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hour_angle = ((ast_time.hour * 60 + ast_time.minute) - 720) / 4
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hour_angle_radian = math.radians(hour_angle)
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self.hour_angles.append(hour_angle)
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return hour_angle_radian
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def solar_altitude(self, declination_radian, hour_angle_radian):
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solar_altitude_radians = math.asin(math.cos(self.location_latitude_rad) * math.cos(declination_radian) *
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math.cos(hour_angle_radian) + math.sin(self.location_latitude_rad) *
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math.sin(declination_radian))
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solar_altitude = math.degrees(solar_altitude_radians)
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self.solar_altitudes.append(solar_altitude)
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return solar_altitude_radians
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def zenith(self, solar_altitude_radians):
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solar_altitude = math.degrees(solar_altitude_radians)
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zenith_degree = 90 - solar_altitude
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zenith_radian = math.radians(zenith_degree)
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self.zeniths.append(zenith_degree)
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return zenith_radian
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def solar_azimuth_analytical(self, hourangle, declination, zenith):
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numer = (math.cos(zenith) * math.sin(self.location_latitude_rad) - math.sin(declination))
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denom = (math.sin(zenith) * math.cos(self.location_latitude_rad))
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if math.isclose(denom, 0.0, abs_tol=1e-8):
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cos_azi = 1.0
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else:
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cos_azi = numer / denom
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cos_azi = max(-1.0, min(1.0, cos_azi))
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sign_ha = math.copysign(1, hourangle)
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solar_azimuth_radians = sign_ha * math.acos(cos_azi) + math.pi
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solar_azimuth_degrees = math.degrees(solar_azimuth_radians)
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self.solar_azimuths.append(solar_azimuth_degrees)
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return solar_azimuth_radians
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def incident_angle(self, solar_altitude_radians, solar_azimuth_radians):
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incident_radian = math.acos(math.cos(solar_altitude_radians) *
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math.cos(abs(solar_azimuth_radians - self.surface_azimuth_rad)) *
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math.sin(self.tilt_angle_rad) + math.sin(solar_altitude_radians) *
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math.cos(self.tilt_angle_rad))
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incident_angle_degrees = math.degrees(incident_radian)
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self.incidents.append(incident_angle_degrees)
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return incident_radian
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@property
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def calculate(self) -> pd.DataFrame:
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for i in range(len(self.times)):
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datetime_val = self.times[i]
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day_of_year = self.day_of_year[i]
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declination_radians = self.declination_angle(day_of_year)
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ast_time = self.solar_time(datetime_val, day_of_year)
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hour_angle_radians = self.hour_angle(ast_time)
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solar_altitude_radians = self.solar_altitude(declination_radians, hour_angle_radians)
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zenith_radians = self.zenith(solar_altitude_radians)
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solar_azimuth_radians = self.solar_azimuth_analytical(hour_angle_radians, declination_radians, zenith_radians)
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incident_angle_radian = self.incident_angle(solar_altitude_radians, solar_azimuth_radians)
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self.df['DateTime'] = self.times
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self.df['AST'] = self.ast
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self.df['hour angle'] = self.hour_angles
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self.df['eot'] = self.eot
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self.df['declination angle'] = self.declinations
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self.df['solar altitude'] = self.solar_altitudes
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self.df['zenith'] = self.zeniths
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self.df['solar azimuth'] = self.solar_azimuths
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self.df['incident angle'] = self.incidents
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return self.df
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