Browsing by Author "Garay Martinez, Roberto"
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Item Full scale experimental performance assessment of a prefabricated timber panel for the energy retrofitting of multi-rise buildings(2017-09) Garay, Roberto; Benito Ayucar, Josu; Arregi Goikolea, Beñat; Garay Martinez, Roberto; Tecnalia Research & Innovation; Materiales Construcción Azpeitia; EDIFICACIÓN DE ENERGÍA POSITIVAA prefabricated timber façade system is presented for the energy retrofitting of buildings. Large panel dimensions facilitate the installation of this system, with reduced disturbance to building users and increased overall quality in terms of thermal bridge mitigation and air tightness of architectural junctions. A full scale proof of concept test is performed, where several prefabricated timber panels were installed over a pre-existing brick façade, their junctions tested, and the differential thermal performance of the system is evaluated. It is concluded that the overall thermal performance of the system is satisfactory in terms of overall U-value, thermal bridge coefficient and, temperature factor. Furthermore, and based on experimentally obtained data, a dynamic characterization of the harmonic thermal response of the system is performed.Item Hybrid numerical and experimental performance assessment of structural thermal bridge retrofits(2018) Garay, Roberto; Garay Martinez, Roberto; Tecnalia Research & InnovationA methodological approach to the multi-dimensional heat transfer assessment of building envelopes is performed. The proposed method is particularly focused on thermally weak points in envelope-structure junctions and the assessment of envelope retrofit alternatives. Thermal performance in these spots is seldom assessed in energy audit processes, although it is one of the main heat loss paths in many insulated façade solutions. An envelope-slab junction case is presented, where multi-dimensional heat transfer occurs. The present paper proposes a methodology which allows for a hybrid experimental and numerical performance assessment in such circumstances. A numerical model is calibrated against experimental data, which is then modified to reflect various envelope retrofit solutions. Several possible analysis procedures are proposed, based on the capacities of transient thermal models.Item Thermal assessment of ambient pressure dried silica aerogel composite boards at laboratory and field scale(2016-09-15) Garay, Roberto; Goiti, Eunate; Reichenauer, Gudrun; Zhao, Shanyu; Koebel, Matthias; Barrio, Aitor; Garay Martinez, Roberto; Tecnalia Research & Innovation; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓN; BIOECONOMÍA Y CO2In the context of increasing energy costs and the need for global reduction of CO2 emissions, the development of superinsulation materials for the construction sector allows the design of low-energy buildings. Since still being in an experimental or at early-commercial stage, R&D of these materials focused on its final application is required, to accelerate access to the market for renovation of the building stock where space is a critical metric. In this paper, the experimental assessment of the thermal performance of a novel ambient pressure dried silica aerogel based composite is presented. In order to provide assessments at both, material and system levels, stress-strain tests, hot plate measurements, as well as full scale tests under realistic boundary conditions were conducted. The overall results are that this material provides good insulation properties (thermal conductivity in the range of 0.015–0.018 W/mK), along with sufficient mechanical properties, and allows for the creation of superinsulating assemblies even at small wall thickness.