Accelerated weathering of photovoltaic modules / Andreas Riedl in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 203, N° 4588 (09/2013)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 203, N° 4588 (09/2013) . - p. 18-21 Titre : Accelerated weathering of photovoltaic modules Type de document : texte imprimé Auteurs : Andreas Riedl, Auteur Année de publication : 2013 Article en page(s) : p. 18-21 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Energie solaire Essais accélérés (technologie) Matériaux -- Détérioration Matériaux -- Effets du climat Photopiles Index. décimale : 667.9 Revêtements et enduits Résumé : The specific challenges of how the principles of weathering testing can be applied to durability testing of PV modules are discussed by Dipl-Phys Andreas Riedl, Atlas Material Testing Technology, who suggests one approach to an appropriate test programme. Photovoltaic (PV) modules combine a variety of materials and components like glass, encapsulants, backsheets, adhesives, framing and fixtures, junction boxes and cables. Each component reacts to the impact of solar radiation, heat and moisture in its specific way and contributes to the overall weather ageing of the complete module. Due to the complex nature of the system, the high lifetime expectation and the size of the test specimens, weathering testing of PV modules is both a technical and economic challenge. Nevertheless, appropriate accelerated weathering test methods for complete PV modules, as well as their individuel mate-rials and components are required to back up warranty statements, support bankability, ensure return of investment and avoid liability claims. Note de contenu : - Weathering takes time as the maximum stress levels have to be realistic - Primary weather factors have to act simultaneously and in a cyclic manner - The laboratory light has to resemble the sun to avoid unrealistic degradation - HOW LONG WILL A MODULE LAST ? - ENVIRONMENTAL DURABILITY TESTING OF PV MODULES : The laboratory test equipment used has to be big enough tohold a full module - All relevant stresses (heat, moisture, radiation, salt,freeze-thaw, corrosion, etc.) have to be applied on the same module under test, as they are in the real world - The primary weather factors heat, moisture and radiation have to be applied simultaneously and in a cyclic manner - The test programme has to be long enough to achieve sufficient accumulation of stresses and damage - The PV modules have to be operated during weathering testing - In addition to the laboratory accelerated test, identical modules should be exposed outdoors under benchmark conditions for reference En ligne : https://drive.google.com/file/d/1QW0gBR4s3pW_jeA1QkZ5fRco6FfBv_WB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19314 [article]

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Experimental study of the effect of curing mode on concreting in hot weather / Nassima Bakir in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 31, N° 4 (08/2021)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 31, N° 4 (08/2021) . - p. 243-248 Titre : Experimental study of the effect of curing mode on concreting in hot weather Type de document : texte imprimé Auteurs : Nassima Bakir, Auteur Année de publication : 2021 Article en page(s) : p. 243-248 Note générale : Bibliogr. Langues : Français (fre) Catégories : Humidité Matériaux -- Effets du climat Matériaux cimentaires -- Propriétés mécaniques Matériaux cimentaires -- Séchage Polyéthylène Polymérisation Température Index. décimale : 668.9 Polymères Résumé : Most developing countries have hot climate, ordinary jobsites characterized by reduced of human resources, equipment and infrastructures. The objective of this article is to make an experimental study of the influence of the hot climate such as that of Algeria, on the different properties of concrete in the fresh state, such as excessive water evaporation from the concrete surface, increased demand for water, increased slump loss corresponding to additional water on job-site, higher plastic shrinkage cracking and difficulty in controlling air content. At the hardened state, we could mention a reduction of strength at 28 days, decreased durability resulting from cracking at long-term period. To show the problems linked to concreting under these conditions and to present the appropriate solutions concrete or mortar can withstand the conditions in which it is implemented. Thus, negative effects caused principally by hot weather concreting motivated the choice of the such study. The research experimental work conditions in which the cementitious matrix was kept concerned two different environments, namely hot and dry climate conditions (t = 40°, h = 0%) alike the climate of the region of M'sila., and that of a medium with a hot and humid environment (t = 40°, h = 100%). The output of the investigation demonstrated the crucial role of the cure method in hot regions. The comparison of results for a reference concrete kept in air without any curing measures with two curing types simulating hot weather environment of the region M’sila was undertaken. These obtained outcome results were discussed based on the influence of climatic conditions to conclude procedures for hot weather concreting and suitable cure methods. Note de contenu : - MATERIALS - EQUIPMENT AND PROCEDURES : Equipment - Procedures - Tests carried out - RESULTS AND DISCUSSION : Influence of curing methods on compressive and tensile strength Influence of storage conditions on compressive and tensile strength - Influence of curing and climatic storage conditions on the absorption of the mortar - Table 1 : Chemical composition of the cement used - Table 2 : Mineralogical composition of the cement used - Table 3 : Storage conditions of the test pieces DOI : https://doi.org/10.18280/rcma.310408 En ligne : https://www.iieta.org/download/file/fid/60233 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37675 [article]

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