The applicability of accelerated life testing for assessment of service life of solar thermal components

Carlsson, Bo; Möller, Kenneth; Köhl, Michael; Heck, Markus; Brunold, S; Frei, Ulrich; Maréchal, Justine; Jorgensen, Gary

doi:10.1016/j.solmat.2004.01.046

Cited by 36 publications

(14 citation statements)

References 6 publications

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“…A well-accepted model of the humidity stress factor was proposed by Peck 27 for epoxy packages for microelectronic devices and is now referred to as Peck's model. 7,28,29 The corresponding relationship is given by Eq. 8, where t f is the time to failure, RH is the relative humidity and n is a kinetic parameter dependent on the material:…”

Section: Basic Considerations On Peck and Eyring Relationshipsmentioning

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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Section: Basic Considerations On Peck and Eyring Relationshipsmentioning

confidence: 99%

Accelerated aging test modeling applied to solar mirrors

et al. 2019

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“…Within this project, different degradation models have been reviewed in order to obtain a good correlation between accelerated indoor aging and in-use outdoor weathering [25][26][27][28]. The accelerated aging tests revealed that next to temperature both UV radiation and humidity independently caused significant degradation of the investigated materials.…”

Section: Lifetime Modelmentioning

confidence: 99%

“…Also very important for the accuracy of the calculated modeling results is the correct implementation of the microclimate for every layer within a PV module [28,30]. Factors like e.g.…”

Section: Evaluation Of the Modelmentioning

confidence: 99%

Qualification of polymeric components for use in PV modules

Möller¹

2011

SPIE Proceedings

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The aim of these investigations was to develop, implement and evaluate an appropriate procedure in order to qualify new polymeric components for the use in PV modules and to predict the lifetime of materials and modules. A test program concerning five accelerated artificial aging tests (varying UV, temperature and humidity levels) was set up and the degradation behavior of six polymers was investigated. Visual transmittance and strain-at-break were identified as most significant degradation indicators. A suitable material specific material degradation model was obtained, where changes of the material properties are accurately related to the applied environmental stresses. For the modeling of service life time the micro-climate, to which the encapsulation materials are exposed in a PV-module, was considered and reasonable end-of-life criteria were defined. Accelerated aging tests showed that effects of heat and humidity are dominating in optical properties, whereas changes in mechanical properties are equally effected by UV and humidity. An exact description of the micro-climate was found to be most critical for the accuracy of the material degradation model. For first qualification of the principal applicability of new materials both, a standard damp heat test and a UV test have to be done in order to validate all degradation effects properly.

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“…In order to study the durability of selective solar absorber coatings, two alternatives must be considered. One is to study its durability on different natural exposure test sites (Slamova et al 2016) and, the other, is to develop accelerated aging test procedures in which the stress levels of one or more degradation factors are kept higher relative to in-use conditions (Carlsson et al 2004 andISO/TR 16335:2013). The study of the durability of different selective solar absorber coatings in natural exposure was already performed and published by the authors (Diamantino et al 2017) and is an important knowledge for the optimization of accelerated aging tests to be applied for qualification in terms of durability of the different solar absorber coatings.…”

Section: Introductionmentioning

confidence: 99%

Accelerated Aging Tests for Solar Absorber Coatings

Diamantino¹,

Gonçalves²,

Páscoa³

et al. 2018

Proceedings of EuroSun 2018

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The need of a higher role of solar energy within the energy mix in the coming decades obliges the systems to increase their performance and reliability. It is demanded that the solar absorbers, as the key component of solar thermal systems, should be low cost with high efficiency for extended lifetimes under different kinds of environments. Commercially, there are two different types of solutions as selective solar absorbers coatings: coatings obtained by physical vapor deposition (PVD) and by paint coatings (PC). These coatings present different physical and chemical characteristics. Therefore, it is important to know how these coatings degrade over time in different environments. Results obtained with two different PVD coatings and three PC, under different accelerated aging tests, are presented. The aging tests performed included different environmental stress corrosion conditions: temperature, humidity, chlorides, sulphur dioxide and nitrogen oxides. Cyclic variation of corrosion promoting gases (sulfur dioxide and nitrogen dioxide), higher humidity, salt spraying and drying seem to be an aging test that reflects the different environments where the solar thermal collectors are exposed. In addition to the contaminants, drying / wetting cycles also play an important role in degradation mechanisms of absorber coatings.

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The applicability of accelerated life testing for assessment of service life of solar thermal components

Cited by 36 publications

References 6 publications

Accelerated aging test modeling applied to solar mirrors

Accelerated aging test modeling applied to solar mirrors

Qualification of polymeric components for use in PV modules

Accelerated Aging Tests for Solar Absorber Coatings

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