114 lines
5.0 KiB
Python
114 lines
5.0 KiB
Python
import pandas as pd
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import math
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import hub.helpers.constants as cte
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from hub.helpers.monthly_values import MonthlyValues
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class RadiationTilted:
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def __init__(self, building, solar_angles, tilt_angle, ghi, solar_constant=1366.1, maximum_clearness_index=1,
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min_cos_zenith=0.065, maximum_zenith_angle=87):
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self.building = building
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self.ghi = ghi
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self.tilt_angle = tilt_angle
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self.zeniths = solar_angles['zenith'].tolist()[:-1]
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self.incidents = solar_angles['incident angle'].tolist()[:-1]
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self.date_time = solar_angles['DateTime'].tolist()[:-1]
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self.ast = solar_angles['AST'].tolist()[:-1]
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self.solar_azimuth = solar_angles['solar azimuth'].tolist()[:-1]
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self.solar_altitude = solar_angles['solar altitude'].tolist()[:-1]
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data = {'DateTime': self.date_time, 'AST': self.ast, 'solar altitude': self.solar_altitude, 'zenith': self.zeniths,
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'solar azimuth': self.solar_azimuth, 'incident angle': self.incidents, 'ghi': self.ghi}
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self.df = pd.DataFrame(data)
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self.df['DateTime'] = pd.to_datetime(self.df['DateTime'])
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self.df['AST'] = pd.to_datetime(self.df['AST'])
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self.df.set_index('DateTime', inplace=True)
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self.solar_constant = solar_constant
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self.maximum_clearness_index = maximum_clearness_index
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self.min_cos_zenith = min_cos_zenith
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self.maximum_zenith_angle = maximum_zenith_angle
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self.i_on = []
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self.i_oh = []
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self.k_t = []
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self.fraction_diffuse = []
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self.diffuse_horizontal = []
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self.beam_horizontal = []
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self.dni = []
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self.beam_tilted = []
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self.diffuse_tilted = []
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self.total_radiation_tilted = []
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self.calculate()
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def dni_extra(self):
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for i in range(len(self.df)):
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self.i_on.append(self.solar_constant * (1 + 0.033 * math.cos(math.radians(360 * self.df.index.dayofyear[i] / 365))))
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self.df['extraterrestrial normal radiation (Wh/m2)'] = self.i_on
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def clearness_index(self):
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for i in range(len(self.df)):
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self.i_oh.append(self.i_on[i] * max(math.cos(math.radians(self.zeniths[i])), self.min_cos_zenith))
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self.k_t.append(self.ghi[i] / self.i_oh[i])
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self.k_t[i] = max(0, self.k_t[i])
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self.k_t[i] = min(self.maximum_clearness_index, self.k_t[i])
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self.df['extraterrestrial radiation on horizontal (Wh/m2)'] = self.i_oh
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self.df['clearness index'] = self.k_t
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def diffuse_fraction(self):
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for i in range(len(self.df)):
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if self.k_t[i] <= 0.22:
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self.fraction_diffuse.append(1 - 0.09 * self.k_t[i])
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elif self.k_t[i] <= 0.8:
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self.fraction_diffuse.append(0.9511 - 0.1604 * self.k_t[i] + 4.388 * self.k_t[i] ** 2 -
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16.638 * self.k_t[i] ** 3 + 12.336 * self.k_t[i] ** 4)
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else:
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self.fraction_diffuse.append(0.165)
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if self.zeniths[i] > self.maximum_zenith_angle:
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self.fraction_diffuse[i] = 1
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self.df['diffuse fraction'] = self.fraction_diffuse
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def radiation_components_horizontal(self):
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for i in range(len(self.df)):
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self.diffuse_horizontal.append(self.ghi[i] * self.fraction_diffuse[i])
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self.beam_horizontal.append(self.ghi[i] - self.diffuse_horizontal[i])
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self.dni.append((self.ghi[i] - self.diffuse_horizontal[i]) / math.cos(math.radians(self.zeniths[i])))
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if self.zeniths[i] > self.maximum_zenith_angle or self.dni[i] < 0:
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self.dni[i] = 0
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self.df['diffuse horizontal (Wh/m2)'] = self.diffuse_horizontal
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self.df['dni (Wh/m2)'] = self.dni
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self.df['beam horizontal (Wh/m2)'] = self.beam_horizontal
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def radiation_components_tilted(self):
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for i in range(len(self.df)):
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self.beam_tilted.append(self.dni[i] * math.cos(math.radians(self.incidents[i])))
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self.beam_tilted[i] = max(self.beam_tilted[i], 0)
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self.diffuse_tilted.append(self.diffuse_horizontal[i] * ((1 + math.cos(math.radians(self.tilt_angle))) / 2))
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self.total_radiation_tilted.append(self.beam_tilted[i] + self.diffuse_tilted[i])
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self.df['beam tilted (Wh/m2)'] = self.beam_tilted
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self.df['diffuse tilted (Wh/m2)'] = self.diffuse_tilted
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self.df['total radiation tilted (Wh/m2)'] = self.total_radiation_tilted
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def calculate(self) -> pd.DataFrame:
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self.dni_extra()
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self.clearness_index()
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self.diffuse_fraction()
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self.radiation_components_horizontal()
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self.radiation_components_tilted()
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return self.df
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def enrich(self):
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tilted_radiation = self.total_radiation_tilted
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self.building.roofs[0].global_irradiance_tilted[cte.HOUR] = [x * cte.WATTS_HOUR_TO_JULES for x in
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tilted_radiation]
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self.building.roofs[0].global_irradiance_tilted[cte.HOUR] = [x * cte.WATTS_HOUR_TO_JULES for x in
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tilted_radiation]
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self.building.roofs[0].global_irradiance_tilted[cte.MONTH] = (
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MonthlyValues.get_total_month(self.building.roofs[0].global_irradiance_tilted[cte.HOUR]))
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self.building.roofs[0].global_irradiance_tilted[cte.YEAR] = \
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[sum(self.building.roofs[0].global_irradiance_tilted[cte.MONTH])]
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