A simple procedure for correcting shadowband data for all sky conditions

LeBaron, B.A.; Michalsky, Joseph; Perez, Richard

doi:10.1016/0038-092x(90)90053-f

Cited by 98 publications

(53 citation statements)

References 9 publications

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“…Diffuse irradiance readings were corrected using four shadowband correction models namely the Drummond [2], LeBaron [3], Battles [4], and Muneer and Zhang [1,5] as described by Kudish and Evseev [6]. Drummond's model assumes isotropic distribution of diffuse radiation and it's a purely geometrical correction factor, given by the equations:…”

Section: Methodsmentioning

confidence: 99%

Use of shadowband correction models for predicting direct solar irradiance

Kotti

Argiriou

Kazantzidis³

2013

AIP Conference Proceedings

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Abstract. Direct solar irradiance can be calculated from global and diffuse horizontal irradiance measurements. However diffuse irradiance values need to be corrected because the pyranometer's shadowband does obstruct not only the solar disk but also a larger part of the sky. This correction is necessary in order to calculate more accurately direct irradiance when not directly measured. In this work we study the impact of these corrections on calculated normal direct irradiance under different sky conditions.

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Section: Methodsmentioning

confidence: 99%

Use of shadowband correction models for predicting direct solar irradiance

Kotti

Argiriou

Kazantzidis³

2013

AIP Conference Proceedings

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“…Finally, under certain circumstances, it could be of interest to allow for the possible reflection from the band's interior surface onto the detector. As analyzed by LeBaron et al (1990) this contribution is strongest at high solar zenith angles near the summer and winter solstices, but because shadowbands are usually painted with a low albedo black this effect has little importance.…”

Section: Introductionmentioning

confidence: 99%

“…Different authors (Drummond, 1956;Painter, 1981;Kasten, 1983;Steven, 1984;Dehne, 1984;Stanhill, 1985;Pollard and Langevine, 1988;LeBaron et al, 1990;Kudish and Ianetz, 1993) have addressed the necessity of applying a correction factor. The accuracy of this correction is important since any subsequent calculation of the direct component is affected, particularly for high zenith angles.…”

Section: Introductionmentioning

confidence: 99%

96/00573 On shadowband correction methods for diffuse irradiance measurements

1996

Fuel and Energy Abstracts

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Abstract-Diffuse irradiance, G,, is an important variable in solar resource assessment. The diffuse irradiante can be worked out from global, G, and direct, Gb. irradiance measurements, but this method involves the use of relatively expensive tracking mechanisms. Alternatively, a widely accepted technique uses a pyranometer with a shadowband. Because the shadowband screens the sensor from part of the diffuse radiation coming in from the sky, a correction must be made to the measurements. However, because of the anisotropy of diffuse radiation it is difficult to compute an exact theoretical correction. In this study we use two data sets registered in two locations in Spain. The first one consists in coincident hourly values of global, direct, and diffuse irradiance; the latter by means of shadowband. The other data set includes the same variables but as 5-minute values. Our goal is to study the necessary correction factor for diffuse irradiance measurements obtained by means of shadowband. After testing several well-known correction methods, we have developed two different correction models, using two-thirds of the hourly data set, while the remaining one-third and the whole S-minute data set have been used for validation purposes. The last validation test suggests that our anisotropic models provide reliable corrections for conditions different than the ones where they have been developed. The results obtained by the developed models show a negligible mean bias deviation. Approximately 55% of cases present deviations lower than 5% over the mean value of diffuse h-radiance.

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“…Thus it was necessary to correct the values of erythemal diffuse irradiance. To do this we applied three models, described in the bibliography and developed for measurement of diffuse irradiance in the whole of the solar spectral range: (1) the isotropic model, or Drummond model [Drummond, 1956]; (2) the LeBaron model [LeBaron et al, 1990], which considers diffuse radiation anisotropy by including two parameters (the clearness index for the diffuse irradiance and the quotient between the diffuse irradiance and the sum of the direct normal and diffuse irradiances); and (3) the Batlles model [Batlles et al, 1995], which considers the same parameters as the LeBaron model but proposes an analytic function rather than a tabulation.…”

Section: Models For the Correction Of The Shadowbandmentioning

confidence: 99%

“…

[1] Measurements of diffuse UV erythemal radiation (UVER) using a shadowband have been corrected using the models proposed by Drummond (1956), LeBaron et al (1990), andBatlles et al (1995). Two different methods were used to validate these models: intercomparison with an Optronic OL754 spectroradiometer and comparison with the values simulated by two radiative transfer codes, SMARTS and SBDART.

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mentioning

confidence: 99%

Diffuse UV erythemal radiation experimental values

Utrillas¹,

Marı́n²,

Esteve³

et al. 2007

J. Geophys. Res.

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[1] Measurements of diffuse UV erythemal radiation (UVER) using a shadowband have been corrected using the models proposed by Drummond (1956), LeBaron et al. (1990), andBatlles et al. (1995). Two different methods were used to validate these models: intercomparison with an Optronic OL754 spectroradiometer and comparison with the values simulated by two radiative transfer codes, SMARTS and SBDART. For this comparison only clear days have been used. The corrected experimental values were analyzed in order to study the average values of the diffuse UVER fraction in relation to the clearness index k t . These varied between 62%, for k t close to 0.8, and 93% for k t of 0.2-0.3. Finally, a study of the monthly average and extreme values of the UV Index for diffuse radiation is presented, showing a maximum value of 6 in June.

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A simple procedure for correcting shadowband data for all sky conditions

Cited by 98 publications

References 9 publications

Use of shadowband correction models for predicting direct solar irradiance

Use of shadowband correction models for predicting direct solar irradiance

96/00573 On shadowband correction methods for diffuse irradiance measurements

Diffuse UV erythemal radiation experimental values

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