Modeling and Calculation of the Global Solar Irradiance on Slopes

Bálint, Roland; Fodor, Attila; Szalkai, István; Szalkai, Zsófia; Magyar, Attila

doi:10.33927/hjic-2019-09

Cited by 5 publications

(6 citation statements)

References 7 publications

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“…F 0 stands for the solar radiation accepted per unit area per second where there is perpendicular to the sunshine outside the atmosphere, also known as the solar constant. This paper takes it as 1367 W/m 2 [52]; E d (λ) represents the water surface incident radiance, which can be calculated with the reflection intensity of standard whiteboard (L P ) measured:…”

Section: Calculation Of Normalized Water-leaving Radiance and Incidenmentioning

confidence: 99%

The Color Formation Mechanism of the Blue Karst Lakes in Jiuzhaigou Nature Reserve, Sichuan, China

Zhang

Xiao

et al. 2020

Water

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The karst lakes in Jiuzhaigou Nature Reserve are an integral part of the karst lake landscape, yet research on the formation mechanism for the color of the blue-green lakes in Jiuzhaigou is insufficient. With the help of hyperspectral instruments, coupled with hydro-chemical analysis, this paper elaborates on the unique color characteristics of the Jiuzhaigou karst lakes, delves into the color formation mechanism of the lakes, establishes a regression equation for the color of the lakes as well as the water quality parameters, and sheds light upon the causes for the color distinction between the karst lakes in Jiuzhaigou and the plateau freshwater lakes. The experiment shows that the Jiuzhaigou karst lakes are primarily blue and green, while the proportion of short-wavelength light in the normalized water-leaving radiance and the total incident irradiance of lake water is higher. Based on the redundancy analysis and the correlation analysis, travertine deposition is the core link in the color formation of the blue karst lakes in Jiuzhaigou, while the selective reflection and scattering of the suspended calcium carbonate particulate matters towards visible light represents the optical foundation for the formation. In addition, physical factors such as depth and transparency, changes to the water quality parameters that affect the travertine deposition rate, and the eutrophication process will all exert significant influence over the formation. By building on water-leaving radiance, this paper quantifies the lake color with the tristimulus values (R, G, B) via colorimetrical methods, which features solid goodness of fit with the linear regression equation established based on the water quality parameters. The principal component analysis and colorimetrical analysis show that the color of the karst lakes in Jiuzhaigou varies substantially from that of the plateau freshwater lakes, which mainly results from the difference in the water quality. Research conducted in this paper on the color formation mechanism of the distinct blue karst lakes in Jiuzhaigou illuminates the formation and maintenance mechanism of the plateau karst lakes, which is conducive to better understanding towards the relationship between the water quality and colors of the karst lakes, and provides scientific proof for the establishment of the water quality assessment indicator system based on the colors of the karst lakes.

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Section: Calculation Of Normalized Water-leaving Radiance and Incidenmentioning

confidence: 99%

The Color Formation Mechanism of the Blue Karst Lakes in Jiuzhaigou Nature Reserve, Sichuan, China

Zhang

Xiao

et al. 2020

Water

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“…In the previous work [31] a simple model has been described for calculating the global horizontal solar irradiance using astronomical relationships (equations ( 1)-( 3)). From this data the global solar irradiance has been calculated on a surface for a given orientation (azimuth and tilt angle) (4).…”

Section: Estimation Model Of Power Generationmentioning

confidence: 99%

“…From this data the global solar irradiance has been calculated on a surface for a given orientation (azimuth and tilt angle) (4). The solar irradiance on the PV panels can be calculated from the irradiance on the horizontal surface using the geometrical parameters of the installation of the PV panels [31].…”

Section: Estimation Model Of Power Generationmentioning

confidence: 99%

“…where pv G is the global solar irradiance on the modul surface as a function of cloudiness ( N ) and orientation ( pv  azimuth and pv  tilt angle), the total surface pv A of the PV power plant and the PV moduls actual efficiency is pv  which depends on the module temperature pv T . As opposed to the previous model [31] this model takes the clouds and the panel efficiency into account. The PV panels nominal efficiency (irradiance of 1000 2 m W and 25 °C cell temperature) and the temperature coefficients are obtained from the PV panel datasheet.…”

Section: Estimation Model Of Power Generationmentioning

confidence: 99%

“…The proposed predictive photovoltaic power generation model uses standard weather forecast data as input and predicts the generated power by taking the thermal efficiency decreasion of the panel into account. The model is based on a previously developed solar geometry model [31].…”

Section: Introductionmentioning

confidence: 99%

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Bálint¹,

Fodor²,

Magyar³

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An electrical power production estimation model has been proposed in this paper for PV panels. The model uses weather forecast data of a time interval (e.q. one day ahead) as input and gives an estimation to electricity generation for the same time interval. The proposed method takes into account the thermal effects taking place in a solar panel as well as the temperature dependent nature of the solar panel efficiency. The results of this paper could be utilized by transmission system operator, distribution system operator, virtual power plant and microgrid operators. The precise mathematical model of the renewable energy resources, which the function of the weather forecast is necessary for the very large scale integration to the electrical transmission system.

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Quaternion-based irradiance calculation method applicable to solar power plants energy production

Knolmajer,

Bálint,

Fodor

et al. 2024

Energy

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Modeling and Calculation of the Global Solar Irradiance on Slopes

Cited by 5 publications

References 7 publications

The Color Formation Mechanism of the Blue Karst Lakes in Jiuzhaigou Nature Reserve, Sichuan, China

The Color Formation Mechanism of the Blue Karst Lakes in Jiuzhaigou Nature Reserve, Sichuan, China

Model-based Power Generation Estimation of Solar Panels using Weather Forecast for Microgrid Application

Quaternion-based irradiance calculation method applicable to solar power plants energy production

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