Comparison of measurement techniques for the determination of circumsolar irradiance

Wilbert, Stefan; Pitz‐Paal, Robert; Jaus, J.

doi:10.1063/1.4822222

Cited by 14 publications

(12 citation statements)

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“…Also, the scatter of these ratios for each of the wavelengths investigated by LBNL was quite high (Evans et al 1980). Similar ratios were found in an analysis based on sunshapes predicted by the three-dimensional Monte Carlo radiative transfer model MYSTIC (Mayer 2009) that is part of the libRadtran package and SMARTS2 (Gueymard 2001) in Wilbert, Pitz-Paal, and Jaus (2013). Further, the broadband CSR and especially the spectral CSR depend on the AM.…”

Section: Dni and Circumsolar Irradiancesupporting

confidence: 61%

“…In the 1990s, charge-coupled device cameras were used by the Paul Scherrer Institute and the German Aerospace Center (DLR) (Schubnell 1992), an approach that was followed later by DLR until the end of the last century (Neumann et al 1998). Recently, a method based on two commercial instruments (Visidyne's sun and aureole measurement system, Sytem Advisor Model (SAM), and a CIMEL sun photometer) was presented (Wilbert, Pitz-Paal, and Jaus 2013). Other instruments that measure the circumsolar irradiance are documented in Wilbert, Pitz-Paal, and Jaus (2012); Wilbert, Pitz-Paal, and Jaus (2013); .…”

Section: Dni and Circumsolar Irradiancementioning

confidence: 99%

“…For the physically exact interpretation of the CSR, a disk is calculated as a function of time using the visible disk radius and the time dependent distance between the sun and the Earth (Wilbert, Pitz-Paal, and Jaus 2013). Depending on the authors and the measurement systems, other angles are used for a disk .…”

Section: Dni and Circumsolar Irradiancementioning

confidence: 99%

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Best Practices Handbook for the Collection and Use of Solar Resource Data for Solar Energy Applications

Sengupta¹,

Kurtz²,

Dobos³

et al. 2015

152

121

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ForewordThe first version of this handbook was developed in response to a growing need by the solar energy industry for a single document addressing the key aspects of solar resource characterization. The solar energy industry has developed rapidly throughout the last few years, and there have been significant enhancements in the body of knowledge in the areas of solar resource assessment and forecasting. Thus, this second version of the handbook was developed from the need to update and enhance the initial version and present the state of the art in a condensed form for all of its users.Although the first version of this handbook was developed by only researchers from the National Renewable Energy Laboratory, this version has additional contributions from an international group of experts primarily from the knowledge that has been gained through participation in the International Energy Agency's Solar Heating and Cooling Programme Task 36 and Task 46.As in the first version, this material was assembled by scientists and engineers who have many decades of combined experience in atmospheric science, radiometry, meteorological data processing, and renewable energy technology development.Readers are encouraged to provide feedback to the authors for future revisions and an expansion of the handbook's scope and content. iv This report is available at no cost from the National Renewable Energy Laboratory (NREL) at www.nrel.gov/publications. PrefaceAs the world looks for low-carbon sources of energy, solar power stands out as the single most abundant energy resource on Earth. Harnessing this energy is the challenge for this century. Photovoltaics, solar heating and cooling, and concentrating solar power (CSP) are primary forms of energy applications using sunlight. These solar energy systems use different technologies, collect different fractions of the solar resource, and have different siting requirements and production capabilities. Reliable information about the solar resource is required for every solar energy application. This holds true for small installations on a rooftop as well as for large solar power plants. However, solar resource information is of particular interest for large installations, because they require a substantial investment, sometimes exceeding $1 billion in construction costs. Before such a project is undertaken, the best possible information about the quality and reliability of the fuel source must be made available. That is, project developers need to have reliable data about the solar resource available at specific locations, including historic trends with seasonal, daily, hourly, and (preferably) subhourly variability to predict the daily and annual performance of a proposed power plant. Without this data, an accurate financial analysis is not possible.In September 2008, the U.S. Department of Energy (DOE) hosted a meeting of prominent CSP developers and stakeholders. One purpose was to identify areas in which the DOE's CSP program should focus its efforts to help the industry develop an...

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Section: Dni and Circumsolar Irradiancesupporting

confidence: 61%

Section: Dni and Circumsolar Irradiancementioning

confidence: 99%

See 1 more Smart Citation

Best Practices Handbook for the Collection and Use of Solar Resource Data for Solar Energy Applications

Sengupta¹,

Kurtz²,

Dobos³

et al. 2015

152

121

View full text Add to dashboard Cite

show abstract

“…There have been some efforts to account for the impact of circumsolar radiation and sunshape on concentrating solar energy applications (Bui and Monger, 2004;Reinhardt, 2013;Reinhardt et al, 2014;Wilbert et al, 2012Wilbert et al, , 2013. These applications use concentrating solar collectors whose half-opening angles are typically less than 1 • .…”

Section: Introductionmentioning

confidence: 99%

“…This solar radiance profile is also called the sunshape. Wilbert et al (2012) presented a method for determining the sunshape using a pair of pyrheliometers with different opening angles. The amount of circumsolar radiance and the radial profile of sunshape can also be measured using a Sun and Aureole Measurements (SAM) instrument.…”

Section: Introductionmentioning

confidence: 99%

Disk and circumsolar radiances in the presence of ice clouds

et al. 2017

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Abstract. The impact of ice clouds on solar disk and circumsolar radiances is investigated using a Monte Carlo radiative transfer model. The monochromatic direct and diffuse radiances are simulated at angles of 0 to 8 • from the center of the sun. Input data for the model are derived from measurements conducted during the 2010 Small Particles in Cirrus (SPAR-TICUS) campaign together with state-of-the-art databases of optical properties of ice crystals and aerosols. For selected cases, the simulated radiances are compared with groundbased radiance measurements obtained by the Sun and Aureole Measurements (SAM) instrument.First, the sensitivity of the radiances to the ice cloud properties and aerosol optical thickness is addressed. The angular dependence of the disk and circumsolar radiances is found to be most sensitive to assumptions about ice crystal roughness (or, more generally, non-ideal features of ice crystals) and size distribution, with ice crystal habit playing a somewhat smaller role. Second, in comparisons with SAM data, the ice cloud optical thickness is adjusted for each case so that the simulated radiances agree closely (i.e., within 3 %) with the measured disk radiances. Circumsolar radiances at angles larger than ≈ 3 • are systematically underestimated when assuming smooth ice crystals, whereas the agreement with the measurements is better when rough ice crystals are assumed. Our results suggest that it may well be possible to infer the particle roughness directly from ground-based SAM measurements. In addition, the results show the necessity of correcting the ground-based measurements of direct radiation for the presence of diffuse radiation in the instrument's field of view, in particular in the presence of ice clouds.

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Measurement Systems for Wind, Solar and Hydro Power Applications

Emeis

Wilbert

2021

Springer Handbook of Atmospheric Measurements

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Wind, solar, and hydropower are major forms of the so-called renewable energies. Effective application of renewable energies to supply heat and electricity is weather dependent and needs short-term weather forecasts, as well as historical and climatological information. All relevant measurement sensors were introduced in previous chapters. Here, the special requirements of wind, radiation, and precipitation measurements for planning and operating renewable energy power plants are addressed. The cooling of conventional thermal power plants, the transmission of electricity in cables above ground, and the overall energy demand are weather dependent as well, and thus need atmospheric measurements.

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Comparison of measurement techniques for the determination of circumsolar irradiance

Cited by 14 publications

References 14 publications

Best Practices Handbook for the Collection and Use of Solar Resource Data for Solar Energy Applications

Best Practices Handbook for the Collection and Use of Solar Resource Data for Solar Energy Applications

Disk and circumsolar radiances in the presence of ice clouds

Measurement Systems for Wind, Solar and Hydro Power Applications

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