Comparison of shadow‐ring correction models for diffuse solar irradiance

Sanchez, G.; Serrano, A.; Cancillo, M. L.; García, José Álvarez

doi:10.1029/2011jd017346

Cited by 18 publications

(9 citation statements)

References 23 publications

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“…Some studies confirm that measurements with shadow-rings are comparable to those given by more shadow-ring width-radius ratio (-) q ground isotropic reflectance (-) sophisticated tracking devices under totally cloudy skies, while some differences appear under clear sky conditions (Drummond, 1964;Robinson and Stoch, 1964;Sánchez et al, 2012). This phenomenon can be explained due to the anisotropy effects in the atmosphere and they can be corrected by applying different correction models, supplementary to the geometrical correction model.…”

Section: Measuring Diffuse Solar Irradiancementioning

confidence: 66%

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New device for the simultaneous measurement of diffuse solar irradiance on several azimuth and tilting angles

et al. 2015

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A device is proposed for the measurement of diffuse solar irradiance on tilted surfaces pointing-to as well as fixed on the equatorial direction. Most commercial devices are not designed for this purpose. Here, we present a specific design for a system based on a single multi-lobe shadow-ring that allows us to measure diffuse irradiance with several tilted pyranometers -from 60 to 90 degrees from the horizontal plane -and on different azimuth angles. This first prototype allows us to measure in the four cardinal directions. The ring is designed to minimize the covered celestial dome observed by each sensor. Moreover, the complete device needs a very small installation area and its simplicity means it is inexpensive and easy to operate. The measurements have subsequently to be corrected with a geometrical correction factor that takes into account the portion of the sky vault blocked by the shadow-ring. These measurements are essential for estimating solar potential on tilted surfaces -such as building façades -and for improving current anisotropic solar models, among many other applications.

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Section: Measuring Diffuse Solar Irradiancementioning

confidence: 66%

“…Thus, if we want to improve measurement accuracy, we should in addition apply satisfactory adequate models (Sánchez et al, 2012;Ineichen et al, 1983;Brunger and Hooper, 1993;Kudish and Evseev, 2008).…”

Section: Geometrical Correction Factormentioning

confidence: 99%

New device for the simultaneous measurement of diffuse solar irradiance on several azimuth and tilting angles

et al. 2015

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“…The global UVR on a horizontal plane is monitored in a number of locations across the world, including the Public Health England monitoring network in the UK; it also could be done directly at the location of the population study . The main challenge is the retrieval of the diffuse component of solar radiation as it requires an expensive tracking system of sun position or using shadowing rings with regular azimuthal adjustments and corrections for radiation shadowed by the ring . This consideration often makes deployment of such equipment impractical in field studies which require monitoring of personal UV exposures.…”

Section: Introductionmentioning

confidence: 99%

Method for Measurements of Terrestrial Ultraviolet Radiation on Inclined Surfaces in Personal Dosimetry Field Studies

Corradi

Baczynska

Morelii

et al. 2019

Photochem & Photobiology

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Understanding personal ultraviolet radiation (UVR) exposure is essential for the evaluation of the health risks and benefits; however, personal dosimetry could be challenging in large‐scale or/and long‐term population studies. Alternatively, personal exposure could be simulated using three‐dimensional models and lifestyle surveys together with data on a body position with respect to the sun. These models require a real‐time input on local environmental UVR. The main challenge in using this method is retrieval of the diffuse irradiance as it requires an often‐expensive tracking of solar position. In this study, a hypothesis that UVR measured on a vertical plane in the north direction can be used in the UK as a proxy for diffuse radiation was tested against direct measurements and compared with models based on solar tracker data in Chilton, UK, (51.57°N) in June–July 2018. The statistical analysis over 17 days under all weather conditions showed that for 45° and 90° tilted surfaces the proposed method performed as well as the best of the models based on solar tracker data. A proposed system could offer a portable and low‐cost alternative to measurements of diffuse radiation by solar tracking radiometers for spatial distribution of terrestrial erythema effective UVR in population field studies.

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“…[7] For the particular case of total solar diffuse radiation measured by pyranometers, i.e., diffuse radiation spectrally integrated throughout the whole solar interval (0.285-2.800 mm), several authors have proposed different correction models [Drummond, 1956;Steven, 1984;LeBaron et al, 1990;Batlles et al, 1995;Muneer and Zhang, 2002]. These models have been validated by comparison with experimental measurements at different locations [López et al, 2004a[López et al, , 2004bKudish and Evseev, 2008;Sánchez et al, 2012] and are widely accepted to provide accurate and reliable total solar irradiance values.…”

Section: Introductionmentioning

confidence: 99%

Shadow‐band correction for diffuse ultraviolet radiation measurements

2013

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[1] Although the correction of shadow-band solar total diffuse measurements has been extensively studied, the case of diffuse ultraviolet measurements has not been properly addressed. This study analyzes the correction factor to be applied to experimental measurements performed adapting a shadow-band to a UV radiometer at a radiometric station in Badajoz (Spain). Three different models, based on approaches widely used for correcting total diffuse measurements, have been revised and adapted for the ultraviolet spectral range. Results reveal that some aspects of the correction proposed for total diffuse radiation are not suitable for ultraviolet diffuse radiation. The mathematical expressions are consequently modified to match the behavior in the ultraviolet range. Thus, three correction models particularized for ultraviolet diffuse measurements are proposed and validated against experimental data. The two models adapted from the original expressions proposed by Battles et al., and Steven show the best performance, with rRMSE of 2.74% and 2.20% and rMBE of 1.53% and 0.46%, respectively.Citation: Sa´nchez, G., A. Serrano, and M. L. Cancillo (2013), Shadow-band correction for diffuse ultraviolet radiation measurements,

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Comparison of shadow‐ring correction models for diffuse solar irradiance

Cited by 18 publications

References 23 publications

New device for the simultaneous measurement of diffuse solar irradiance on several azimuth and tilting angles

New device for the simultaneous measurement of diffuse solar irradiance on several azimuth and tilting angles

Method for Measurements of Terrestrial Ultraviolet Radiation on Inclined Surfaces in Personal Dosimetry Field Studies

Shadow‐band correction for diffuse ultraviolet radiation measurements

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