Comparison and Evaluation of Accelerated Aging Tests for Reflectors

Sutter, Florian; Fernández-García, Aranzazú; Wette, Johannes; Heller, Peter

doi:10.1016/j.egypro.2014.03.181

Cited by 37 publications

(13 citation statements)

References 1 publication

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“…All the samples included in this study have in common that the main degradation mechanism provoked by the two durability experiments applied (CASS and Kesternich tests) was the corrosion in the reflective silver layer, both in the form of corrosion spots or corrosion penetration through the edges. This is one of the typical degradation effect reported for silvered-glass reflectors [13,34].…”

Section: Durability Testssupporting

confidence: 52%

Advanced Analysis of Corroded Solar Reflectors

Buendía-Martínez

Fernández-García

Sutter³

et al. 2019

Coatings

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The corrosion of the reflective layer is one of the main degradation mechanisms of solar reflectors. However, the appropriate assessment of the corroded reflector samples is not accomplished by the current analysis techniques. On the one hand, the reflectance measurement protocol of non-damaged solar reflectors for concentrating solar thermal technologies is widely addressed in the SolarPACES reflectance guideline. However, this methodology is not adequate for reflectors whose surface is partially corroded by many kind of corrosion agents. In this work, a new measurement technique to properly assess corroded samples was developed. To check the usefulness of the method, several damaged samples (subjected to two accelerated aging tests) were evaluated with the conventional technique and with the improved one. The results showed that a significant discrepancy is observed between the two methods for heavily corroded samples, with average reflectance differences of 0.053 ppt. The visualization of the reflector images illustrated that the improved method is more reliable. On the other hand, both the corrosion products formed and the corrosion rates were identified after each corrosive test. The chemical atmosphere significantly affects the products formed, whereas the corrosion rates are influenced by the test conditions and the reflector quality.

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Section: Durability Testssupporting

confidence: 52%

Advanced Analysis of Corroded Solar Reflectors

Buendía-Martínez

Fernández-García

Sutter³

et al. 2019

Coatings

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“…On the first hand, the lowest kinetic parameters of Peck and Eyring models, here taken as n = −4 and β = 400, lead to equivalent times of test that can reach 63,000 h. This time is obviously far too long to achieve any laboratory testing, and considerably higher than the duration recognized in the standards, which is approximately a few hundred hours. 26,32,33 On the other hand, if the material has high kinetic coefficient values, here taken as n = −13 and β = 800, the time of test can be appropriate to perform the test in laboratory.…”

Section: Peck and Eyring Numerical Model Parameters Calculation Basedmentioning

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 experimental campaign started with a first round of four key preliminary weathering tests [64], aiming to apply an initial pre-damage to the samples. The experiments selected were radiation with temperature and humidity, UV and humidity cycling, damp heat, and temperature cycling (see Sections 2.5.1-2.5.4).…”

Section: Testing Approachmentioning

confidence: 99%

Solar Reflector Materials Degradation Due to the Sand Deposited on the Backside Protective Paints

Fernández-García¹,

Juaidi

Sutter³

et al. 2018

Energies

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Concentrating solar power (CSP) technologies are foreseen to be a crucial actor in the future renewable energy mix. Soil accumulation on the optical surfaces of CSP plants involves significant expenses of the operation and maintenance activities because a high cleanliness level is required to achieve proper plant revenues. Normally, only the front side of the solar reflectors is cleaned to reflect the maximum possible amount of direct solar radiation towards the receiver. However, soil deposited on the backside of the reflector could provoke degradation and might need to be considered in the cleaning strategy. As this possible degradation has never been studied, this work is dedicated to assess if the backside of reflectors should be regularly cleaned. The influence of the sand in the possible paint degradation depends on its chemical composition and the weather conditions. Therefore, several climatic conditions of artificially soiled reflector samples with different types of sand were simulated in accelerated aging tests. Concerning the results obtained, the ambient conditions simulated by the damp heat and thermal cycling tests were the only ones that produced a significant degradation of the backside paints. Also, the sand from Ouarzazate was responsible for higher deterioration.

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Comparison and Evaluation of Accelerated Aging Tests for Reflectors

Cited by 37 publications

References 1 publication

Advanced Analysis of Corroded Solar Reflectors

Advanced Analysis of Corroded Solar Reflectors

Accelerated aging test modeling applied to solar mirrors

Solar Reflector Materials Degradation Due to the Sand Deposited on the Backside Protective Paints

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