Towards the prediction of CSP mirrors wear: Methodology of analysis of influencing parameters on the mirrors surface degradation: Application in two different sites in Morocco

Karim, Mounia; Naamane, Sanae; Hassani, Iz-Eddine El Amrani El; Delord, Christine; Belcadi, S.; Tochon, Patrice; Bennouna, A.

doi:10.1016/j.solener.2014.06.036

Cited by 33 publications

(25 citation statements)

References 20 publications

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“…This study was made in two different regions in Morocco. Results are reported in a previous work (Karim et al, 2014). 2.…”

Section: Introductionmentioning

confidence: 76%

“…Concerning the geological parameters, sand particles were extracted from both sites according to a standard sampling procedure, EN 932-1. They were analyzed using different techniques in order to determine their properties, size, shape and hardness (Karim et al, 2014). They were prepared and used, in addition to normalized sand, as erosive particles during tests.…”

Section: No No Yes Yesmentioning

confidence: 99%

“…To identify the impact speed values used in the laboratory tests, we determined the occurrence frequency of the wind speed values registered in both natural sites by considering four intervals (lower than 6 m/s, between 6 m/s and 10 m/s, between 10 m/s and 15 m/s and higher than 15 m/s) (Karim et al, 2014). According to the results, we found that the most wind speed values in both sites are below 6 m/s, around 80% in site #1 and about 90% in site #2.…”

Section: Impact Speed and Impact Anglementioning

confidence: 99%

“…After a wet separation of sand and silt clay fractions of sand extracted from natural sites, sand fraction is sieved to determine the size distribution of particles by using a particle size analyzer, Master sizer 3000 provided from Malvern. The particles are then observed under binocular microscope to determine their shape and also their mineralogical composition in order to ascend to the hardness according to Mohs scale (Karim et al, 2014). It is worth to note that during the wet separation, dust fraction and soluble minerals in water, like salts, are not recovered in the sand fraction.…”

Section: Erosive Sand Particlesmentioning

confidence: 99%

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Laboratory simulation of the surface erosion of solar glass mirrors

et al. 2015

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“…This study was made in two different regions in Morocco. Results are reported in a previous work (Karim et al, 2014). 2.…”

Section: Introductionmentioning

confidence: 76%

Section: No No Yes Yesmentioning

confidence: 99%

Section: Impact Speed and Impact Anglementioning

confidence: 99%

Section: Erosive Sand Particlesmentioning

confidence: 99%

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Laboratory simulation of the surface erosion of solar glass mirrors

et al. 2015

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“…The first reason for this negative effect is the direct damage of the deposition process by airborne dust particles [16][17][18]. Karim et al reported that solar mirror surface wear depends on the properties of the sand particles, such as diameter shape, hardness, and density [19]. Apart from the properties of dust particles, the effects of impact speed and angle and the erosive sand particles have been comprehensively investigated [20].…”

Section: Introductionmentioning

confidence: 99%

Experimentally Investigating the Effect of Temperature Differences in the Particle Deposition Process on Solar Photovoltaic (PV) Modules

Jiang

2016

Sustainability

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This paper reports an experimental investigation of the dust particle deposition process on solar photovoltaic (PV) modules with different surface temperatures by a heating plate to illustrate the effect of the temperature difference (thermophoresis) between the module surface and the surrounding air on the dust accumulation process under different operating temperatures. In general, if the temperature of PV modules is increased, the energy conversion efficiency of the modules is decreased. However, in this study, it is firstly found that higher PV module surface temperature differences result in a higher energy output compared with those modules with lower temperature differences because of a reduced accumulation of dust particles. The measured deposition densities of dust particles were found to range from 0.54 g/m 2 to 0.85 g/m 2 under the range of experimental conditions and the output power ratios were found to increase from 0.861 to 0.965 with the increase in the temperature difference from 0 to 50 • C. The PV module with a higher temperature difference experiences a lower dust density because of the effect of the thermophoresis force arising from the temperature gradient between the module surface and its surrounding air. In addition, dust particles have a significant impact on the short circuit current, as well as the output power. However, the influence of particles on open circuit voltage can be negligible.

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Sand erosion of solar glass: Specific energy uptake, total transmittance, and module efficiency

et al. 2017

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Summary Surface roughness, RZ, normal transmittance, ΤN, total transmittance, ΤT, and photovoltaic (PV) module efficiency, ηS, were measured for commercial solar glass plates and PV test modules identically sandblasted with different loads of quartz sand (200–400 μm), impact inclination angles, and sand particle speed. Measured data are presented versus the specific energy uptake during sand blasting, E (J/m2). Cracks, adhering particles, and scratch‐like textures probably caused by plastic flow phenomena could be observed after sand blasting. Their characteristic size was much smaller than that of sand particles. After blasting and subsequent cleaning, the glass surface was still covered with adhering glass particles. These particles, cracks, and scratch‐like textures could not be removed by cleaning. For sand blasting with α = 30° inclination angle and E = 30 000 J/m2, normal transmittance, total transmittance, and relative module efficiency decreased by 29%, 2% and ∽2%, respectively. This finding indicates that diffusive transmission of light substantially contributes to PV module efficiency and that the module efficiency decrease caused by sand erosion can be better estimated from total than by normal transmittance measurements.

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Towards the prediction of CSP mirrors wear: Methodology of analysis of influencing parameters on the mirrors surface degradation: Application in two different sites in Morocco

Cited by 33 publications

References 20 publications

Laboratory simulation of the surface erosion of solar glass mirrors

Laboratory simulation of the surface erosion of solar glass mirrors

Experimentally Investigating the Effect of Temperature Differences in the Particle Deposition Process on Solar Photovoltaic (PV) Modules

Sand erosion of solar glass: Specific energy uptake, total transmittance, and module efficiency

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