A survey of methods for the evaluation of reflective solar concentrator optics

Arancibia-Bulnes, Camilo A.; Peña‐Cruz, Manuel I.; Mutuberría, Amaia; Díaz-Uribe, Rufino; Sánchez-González, Marcelino

doi:10.1016/j.rser.2016.11.048

Cited by 61 publications

(17 citation statements)

References 63 publications

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“…To calculate slope errors to the required level, it is necessary to measure the spatial position to an accuracy of better than 100 µm. There are many methods available to evaluate the surface of the mirrors [7]. Slope measurement methods currently implemented include pattern reflection techniques, such as deflectometry and laser reflection techniques, such as VSHOT.…”

Section: Shape Measurement Methodsmentioning

confidence: 99%

Photogrammetry for Concentrating Solar Collector Form Measurement, Validated Using a Coordinate Measuring Machine

2019

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Concentrating solar power systems currently have a high capital cost when compared with other energy generating systems. The solar energy is captured in the form of thermal energy rather than direct electrical, which is attractive as thermal energy is more straightforward and currently more cost-effective to store in the amounts required for extended plant operation. It is also used directly as industrial process heat, including desalination and water purification. For the technology to compete against other generating systems, it is crucial to reduce the electrical energy cost to less than $0.10 per kilowatt-hour. One of the significant capital costs is the solar field, which contains the concentrators. Novel constructions and improvements to the durability and lifetime of the concentrators are required to reduce the cost of this field. This paper describes the development and validation of an inexpensive, highly portable photogrammetry technique, which has been used to measure the shape of large mirror facets for solar collectors. The accuracy of the technique has been validated to show a whole surface measurement capability of better than 100 m using a large coordinate measuring machine. Qualification of facets of the MATS plant was performed during its installation phase, giving results of the shape, slope and intercept errors over each facet.

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Section: Shape Measurement Methodsmentioning

confidence: 99%

Photogrammetry for Concentrating Solar Collector Form Measurement, Validated Using a Coordinate Measuring Machine

2019

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“…Nevertheless, the best methods for properly performing these measurements are still under discussion in the scientific community. [37][38][39] In this research and according to the guideline from SolarPACES, the specular reflectance of samples was monitored with a portable reflectometer 15R-USB from the Device & Services society. The reflectometer permits the measurement of specular reflectance at λ = 660 nm, with an incidence angle θ inc = 15°.…”

Section: Characterizationmentioning

confidence: 99%

Accelerated aging test modeling applied to solar mirrors

et al. 2019

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The durability of solar mirrors is a critical factor for the deployment of concentrating solar power plants. Accelerated aging test models currently applied in the polymer, electronic, and photovoltaic fields have recently been reviewed, and the issues of their application to solar mirrors have been discussed. This article first reports the results of temperature, humidity, and light irradiance accelerated aging tests performed to assess the dependent parameters of selected models from the literature. These parameters include the apparent activation energy for the Arrhenius temperature law, the Peck and Eyring coefficients for humidity models and the Schwarzschild coefficient for the irradiance law. The experimental values were then assessed for specular reflectance loss of solar mirrors. Finally, using these parameters, acceleration factors were calculated for solar mirrors. An effective temperature considering the Arrhenius degradation law was used rather than the commonly used mean temperature. This question is also addressed for light irradiance by using the dose instead of the mean value.

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“…The paper collects methods of design of such systems and presents a summary of so far developed mathematical model used for simulation of concentrators operation. Arancibia-Bulnes et al [8] summarized methods for evaluating the efficiency of solar concentrators and presented vastly sources of mirror imperfections. Salgado Conrado et al [9] summarized data on thermal performance of parabolic trough solar collectors and reviewed simulation works on the concentrators.…”

Section: Irradiance In Polandmentioning

confidence: 99%

Numerical studies on capability to focus solar radiation with mirrors of different curvatures

Kaczor¹,

Buliński²,

Werle³

2019

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI19S4153KThe article presents the methodology and results of a parametric analysis performed to investigate the effects of changes in the curvature of the solar concentrator mirror on its ability to focus the radiation. Working conditions of the concentrator, i. e. possible values of radiation intensity, were adopted according to irradiance typical for Poland, and, therefore, similar to the conditions in many European countries. The curvatures of examined mirrors were obtained by modification of a parabolic curve. The calculations were conducted for two cases: when the Sun radiation falls completely directly and when it's half diffuse. The 2-D simulations were conducted in ANSYS FLUENT 18.2 software. Discrete ordinates model was employed to simulate radiation phenomenon. Also, a sensitivity analysis was carried on discrete ordinates model parameters and density of the computational mesh. The results allow stating that some of the new curvatures provide only slightly worse focus than the classical parabolic shape, but also show greater insensitivity to the increasing share of diffusive part of radiation. The presented model is a quick and proven tool for testing new curvatures of solar concentrator mirrors.

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A survey of methods for the evaluation of reflective solar concentrator optics

Cited by 61 publications

References 63 publications

Photogrammetry for Concentrating Solar Collector Form Measurement, Validated Using a Coordinate Measuring Machine

Photogrammetry for Concentrating Solar Collector Form Measurement, Validated Using a Coordinate Measuring Machine

Accelerated aging test modeling applied to solar mirrors

Numerical studies on capability to focus solar radiation with mirrors of different curvatures

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