Browsing by Keyword "Encapsulation"
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Item Composite material with enhanced ultraviolet performance stability for photovoltaic modules(2019-09-15) Imbuluzqueta, Gorka; Yurrita, Naiara; Aizpurua, Jon; Cano, Francisco J.; Zubillaga, Oihana; SISTEMAS FOTOVOLTAICOS; SGThe present work aims encapsulating photovoltaic cells in glass reinforced epoxy composite by vacuum resin infusion, incorporating additives directed to enhance the performance stability of the manufactured photovoltaic modules under ultraviolet (UV) exposure. UV absorber (UVA) and hindered amine light stabilizer (HALS) additives were incorporated in the resin system in different content. Photovoltaic performance and stability under UV radiation exposure were studied through external quantum efficiency (EQE) spectra, chromatic coordinates and short-circuit current values. Decrease in current values and increase in yellowness were observed in the presence of UVA and HALS. However, an enhanced performance stability was observed when additives are incorporated, improving the stability when increasing the additive amount. The most stable module, with cells embedded in 2% additive containing composite, showed a 2.7% short-circuit current loss after UV aging exposure.Item Encapsulated high temperature PCM as active filler material in a thermocline-based thermal storage system(2015-05-01) Muñoz-Sánchez, B.; Iparraguirre-Torres, Iñigo; Madina, Virginia; Izagirre, Usoa; Unzurrunzaga-Iturbe, A.; García-Romero, A.; Madina-Arrese, V.; Izagirre-Etxeberria, U.; Tecnalia Research & Innovation; MATERIALES PARA CONDICIONES EXTREMAS; INGENIERÍA DE SUPERFICIES; VALORIZACIÓN DE RESIDUOSA great concern in Concentrated Solar Power (CSP) is to boost energy harvesting systems, by finding materials with enhanced thermal performance. Phase Change Materials (PCM) have emerged as a promising option, due to their high thermal storage density compared to sensible storage materials currently used in CSP. A thermal storage system for solar power plants is proposed, a thermocline tank with PCM capsules together with filler materials, based on multi-layered solid-PCM (MLSPCM) thermocline-like storage tank concept [1,2]. A detailed selection of the most suitable high temperature PCM, their containment materials and encapsulation methods are shown.Item Optical model for multilayer glazing systems: Experimental validation through the analytical prediction of encapsulation-induced variation of PV modules efficiency: Experimental validation through the analytical prediction of encapsulation-induced variation of PV modules efficiency(2016-10-01) Machado, Maider; Baenas, Tomás; Yurrita, Naiara; Tecnalia Research & Innovation; SISTEMAS FOTOVOLTAICOSA simple analytical calculation based on a transfer matrix method for incoherent optics, allowing the prediction of photovoltaic module efficiencies in different encapsulation conditions is presented. This approach is used for the experimental validation of the main features of the optical model for multilayer glazing systems considered, through the relation between the external quantum efficiency of the module and its optical modeling. The theoretical procedure avoids the need to manufacture and characterize by solar simulator or external quantum efficiency measurements all the variety of photovoltaic module configurations, which is of interest at research and manufacturing levels, especially for building-integrated photovoltaics. The absorptivity of encapsulated solar cells is not directly accessible from direct air-bare cell or airencapsulated cell optical measurements, and therefore analytical or numerical methods are generally needed. The calculations presented in this work provide closed analytical expressions for the layer-bylayer absorption of the different components of a photovoltaic module. From a small set of experimental measurements of a particular encapsulation configuration, and the theoretical expressions for spectral absorptivities, the short-circuit current of a module can be predicted for any other encapsulation scheme. It will be proved that the method accurately matches short-circuit current density of the modules as obtained from experimental measurements. Results will be presented for crystalline silicon and CIGS thin film cell technologies with several glass and encapsulation material combinations.Item The role of probiotics in nutritional health: probiotics as nutribiotics: probiotics as nutribiotics(Academic Press; Elsevier Inc., 2022-01-01) Chávarri, María; Diez-Gutiérrez, Lucía; Marañón, Izaskun; del Carmen Villarán, María; Barrón, Luis Javier R.; Alimentación Sostenible; Tecnalia Research & InnovationThe gut microbiota has gained importance through the years due to its significant influences on the maintenance of human health. A wide variety of microorganisms shape this gut microbiota, which preserves health with the modulation of the immune system, enhancement of the nutrients absorption, or the protection against pathogens’ colonization. The disruption of this microenvironment triggers the development of health problems leading to several diseases, such as nutritional health problems. The preservation and restoration of this microbiota is a key factor to maintain the natural body homeostasis. According to nutritional health problems, a long list of probiotics and postmiotic has been classified as nutribiotics due to their potential to improve the nutritional status of people. Likewise, nutribiotics should be properly protected and supply using an adequate encapsulation technique. Furthermore, the rising interest in this kind of products is producing the expansion of the current market and opening multiple business opportunities.