Browsing by Author "García-Romero, A."
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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 Study of the porosity produced in an aluminum alloy matrix composite due to a T6 heat treatment(2004-08) García-Romero, A.; Irisarri, A. M.; Anglada, M.; García-Cordovilla, C.; Tecnalia Research & InnovationIn the present article, the reactions and phase transformations occurring between the fibers and the matrix during the T6 thermal treatment of an industrial composite are analyzed. The composite (taken from prototype diesel piston heads) consisted of an aluminum alloy conforming to AFNOR AS12UNG (Al-12 pct Si-1 pct Mg-1 pct Cu-1 pct Ni) that was reinforced with SAFFIL δ-alumina short fibers. Different heat-treating temperatures, holding times, and heating rates were considered. As a result of all these treatments, small to medium size (between 1 to 10 μm) holes were observed at the matrix-fiber interfaces, although the amount and size varied depending on the heat-treating conditions. This porosity was attributed to the volume contraction associated with the reaction between the silica contained in the preform (colloidal silica is the binder for the alumina fibres) and the magnesium present in the aluminum alloy to produce MgO and Si during the solution heating treatment. This local volume contraction is higher than 28 pct.