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Comparative Validation of Clear Sky Irradiance Models over Finland
IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018Accurate knowledge of the solar irradiance is required for various climate and energy applications. For these applications as well as irradiance forecasts, estimates of clear sky irradiance are often essential as basis for further calculations. In this paper we comparatively validate clear sky irradiance estimates from four fast clear sky models with ...
Viivi Kallio, Aku Riihelä
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Approximate model of clear-sky radiance distribution
SPIE Proceedings, 2006Sky radiance distribution is very important in theoretical study and application of the remote sensing. In this paper, an approximate sky radiance model is developed based on radiation transfer equation. The radiatiance observed from a point at the earth surface is divided into three parts, which is from single scattering, multiple scattering and ...
ChunPing Yang +5 more
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Sampling Clear Sky Models using Truncated Gaussian Mixtures
2021Parametric clear sky models are often represented by simple analytic expressions that can efficiently generate plausible, natural radiance maps of the sky, taking into account expensive and hard to simulate atmospheric phenomena. In this work, we show how such models can be complemented by an equally simple, elegant and generic analytic continuous ...
Nick Vitsas +2 more
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A Study of Models Combination for Global Clear Sky Irradiance Models
2020 47th IEEE Photovoltaic Specialists Conference (PVSC), 2020Clear sky global horizontal irradiance (GHIcs) defines the theoretical maximum irradiance reaching a horizontal surface and are often derived from semi-empirical or physical based clear-sky models. In this study we demonstrate a naive model combination method of global clear sky models for improved estimation of GHIcs.
Xixi Sun, Xiaoyi Yang, Peng Wang
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Choice of clear-sky model in solar forecasting
Journal of Renewable and Sustainable Energy, 2020This paper is concerned with the choice of clear-sky model in solar forecasting. This issue is discussed from three perspectives: (1) accessibility, (2) forecast performance, and (3) statistical properties. Accessibility refers to the time and effort involved in obtaining clear-sky irradiance through a clear-sky model.
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Radiative transfer model for ground surface irradiance estimation: clear sky
Journal of the Optical Society of America A, 2021In this work, a physical model based on the radiative transfer equation is presented to estimate the global solar irradiance on top of the Earth’s atmosphere surface. A link is established among the radiative transfer through the atmosphere, the geographic coordinates of a city (longitude, latitude), time of day, and date of the year.
Romuald Tapimo +3 more
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A clear sky atmospheric model valid for the mediterranean zone
Solar & Wind Technology, 1988Abstract The ASHRAE clear sky model in the version proposed by G.L. Powell has been applied to a set of clear days from two coastal locations of Yugoslavia. The results have provided further elements to confirm the existence of a clear sky atmospheric model valid for the whole Mediterranean zone.
S. Barbaro +5 more
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The ASHRAE clear sky model. An evaluation in the Mediterranean Zone
Solar & Wind Technology, 1988Abstract The ASHRAE clear sky model in the version proposed by G. L. Powell is here applied to a yearly set of data for Palermo with small scale time intervals. The model is shown to yield computed values generally higher than the measured ones. New values for the atmospheric extinction coefficient are derived and proposed for the application to the ...
S. Barbaro +3 more
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Experimental verification of some clear-sky insolation models
Solar Energy, 1988Abstract Clear-sky solar irradiance can be predicted when a number of essential atmospheric parameters are known. A number of parameterization methods to predict solar irradiance with various degrees of difficulty are available in the literature. In this study, three models called model A, model B and model C, with medium degree of difficulty, have ...
A. Louche +3 more
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Modelling clear sky colours: A single scattering approach
Lighting Research & Technology, 2011The theoretical formulae derived in this paper allow a rapid numerical modelling of clear sky colours under various aerosol loadings. After a detailed description of physical models of the atmosphere, numerical examples are performed for different situations.
M Kocifaj, B Kránicz
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