Estimating Solar Irradiance on Inclined Surfaces: A Review and Assessment of Methodologies

Hay, John E.; McKay, Donald G.

doi:10.1080/01425918508914395

Cited by 218 publications

(84 citation statements)

References 36 publications

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“…Besides the PFD on the leaves (I), the PFD on the open horizontal surface (Io) and its diffuse component was also measured. The shade ring (EIKO Seiki, MB-11) was used to estimate diffuse flux of PFD (lOdi f)' The direct flux of PFD (Iodir) was calculated by subtracting IOdif from 1 0 , Zenith and azimuth angles of each leaf were recorded manually with a protractor and compass just before and after the measurement, and then the incidences of direct flux of PFD (t/> and 8) were calculated (Hay and Mckay, 1985). At about noon the next day, PFD on leaves under shaded condition were measured by shading each location with styrene foam plate.…”

Section: Methodsmentioning

confidence: 99%

Spatial and Temporal Variation in Photon Flux Density on Rice (Oryza sativaL.) Leaf Surface

Nishimura

Koizumi

Tang

1998

Plant Production Science

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Section: Methodsmentioning

confidence: 99%

Spatial and Temporal Variation in Photon Flux Density on Rice (Oryza sativaL.) Leaf Surface

Nishimura

Koizumi

Tang

1998

Plant Production Science

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“…Direct irradiance is estimated with the solar zenith angle and the angle of incidence on the generator. Diffuse irradiance is calculated with the anisotropic model proposed in [36]. This model divides the diffuse irradiance in circumsolar (near the sun region) and isotropic, using an anisotropy index to estimate the ratio between them.…”

Section: Effective Irradiationmentioning

confidence: 99%

“…The estimation of the diffuse component makes use of the anisotropic model [36] Albedo irradiance Isotropic diffuse irradiance with reflection factor equal to 0.2.…”

Section: Effective Irradiationmentioning

confidence: 99%

Comparative assessment of global irradiation from a satellite estimate model (CM SAF) and on-ground measurements (SIAR): A Spanish case study

Antoñanzas-Torres

Cañizares²,

David

2013

Renewable and Sustainable Energy Reviews

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An analysis and comparison of daily and yearly solar irradiation from the satellite CM SAF database and a set of 301 stations from the Spanish SIAR network is performed using data of 2010 and 2011. This analysis is completed with the comparison of the estimations of effective irradiation incident on three different tilted planes (fixed, two axis tracking, north-south horizontal axis) using irradiation from these two data sources. Finally, a new map of yearly values of irradiation both on the horizontal plane and on inclined planes is produced mixing both sources with geostatistical techniques (kriging with external drift, KED)The Mean Absolute Difference (MAD) between CM SAF and SIAR is approximately 4% for the irradiation on the horizontal plane and is comprised between 5% and 6% for the irradiation incident on the inclined planes. The MAD between KED and SIAR, and KED and CM SAF is approximately 3% for the irradiation on the horizontal plane and is comprised between 3% and 4% for the irradiation incident on the inclined planes.The methods have been implemented using free software, available as supplementary material, and the data sources are freely available without restrictions.

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“…Despite the vast growth of PV installations and the evergrowing number of available commercial software for their simulation and economic assessment, there has been little to no research regarding the calculative accuracy of commercial PV simulation software packages. Research studies are focused on developing methods which can be used to create new software packages, such as new simulation techniques [17,18], models which can be used to compute the effects of shading [19], methodologies which may be used for the estimation of solar irradiance on inclined surfaces [20], the modelling of PV panels [21] and the simulation of the power electronics involved in PV installations [22,23]. Undoubtedly, commercial PV simulation software packages are using combinations of these models and methodologies, each of which is scientifically sound; however, their accuracy as a complete software package against real-world data has not been assessed.…”

Section: Introductionmentioning

confidence: 99%

Accuracy analysis of software for the estimation and planning of photovoltaic installations

Axaopoulos

Fylladitakis

Gkarakis

2014

Int J Energy Environ Eng

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As the use of photovoltaics expands, with more and more commercial and residential users investing on solar energy systems around the globe, there is substantial demand for relatively simple, easy-to-use software packages, for the planning and performance estimation of photovoltaic installations by installers and architects. In this paper, the calculative accuracy of TRNSYS, Archelios, Polysun, PVSyst, PV*SOL and PVGIS is being examined in comparison to the real electrical energy generated by a grid-connected 19.8 kW p photovoltaic installation. The assessment has been performed by using the climatic data which have been recorded at the site of the real PV park over the same calendar year. Our results displayed that the software packages tend to overestimate the global irradiation received by the PV modules, but still significantly underestimate the electrical energy generated by the installation.

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Estimating Solar Irradiance on Inclined Surfaces: A Review and Assessment of Methodologies

Cited by 218 publications

References 36 publications

Spatial and Temporal Variation in Photon Flux Density on Rice (Oryza sativaL.) Leaf Surface

Spatial and Temporal Variation in Photon Flux Density on Rice (Oryza sativaL.) Leaf Surface

Comparative assessment of global irradiation from a satellite estimate model (CM SAF) and on-ground measurements (SIAR): A Spanish case study

Accuracy analysis of software for the estimation and planning of photovoltaic installations

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