Browsing by Author "Astudillo, Julen"
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Item Dear Scientists, Engineers, and Designers(2018) Astudillo, Julen; Chica, Jose Antonio; Knaack, Ulrich; Klein, Tillmann; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓN; SGItem Experimental and numerical thermal performance assessment of a multi-layer building envelope component made of biocomposite materials(2020-05-01) Arregi, Beñat; Garay-Martinez, Roberto; Astudillo, Julen; García, Miriam; Ramos, Juan Carlos; Tecnalia Research & Innovation; EDIFICACIÓN DE ENERGÍA POSITIVA; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓNBuilding envelope systems are rapidly evolving, driven by increasingly stringent requirements for limiting energy consumption. Current trends favour lightweight, prefabricated wall assemblies with high levels of insulation, which have been shown to be particularly sensitive to thermal bridging through anchoring and framing elements. This paper presents a self-supporting multi-layer wall component made from bio-based materials, where novel biocomposite profiles are used instead of conventional metallic frames. The thermal performance of the proposed solution is calculated from numerical modelling and characterised through in-situ measurement of a full-scale prototype. For the plane areas of the wall with continuous insulation, theoretical calculations are broadly in line with results from experimental monitoring (7–15% deviation). Additionally, an area along a framing profile was specifically monitored, and it was found that the numerical model overestimated thermal resistance with a deviation of 121%. The presence of air gaps between the rigid insulation and framing elements, linked to the fabrication process of the prototype, was identified as a plausible cause. A subsequent explanatory numerical assessment, considering the effect of such cavities in the numerical model, provided results that are consistent with measurements from the experiment and previous literature. The study aims at demonstrating the insulation levels achievable with the use of novel bio-based materials of low thermal conductivity, and more generally, contributing to a better understanding of the thermal performance of framed lightweight insulated assemblies in service conditions, by monitoring and modelling the impact of thermal bridges and workmanship at framing elements.Item JFDE special ICAE2018 - Envelope 4.0(2018) Astudillo, Julen; Chica, Jose Antonio; Knaack, Ulrich; Klein, Tillmann; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓN; SGItem Monitoring and thermal performance evaluation of two building envelope solutions in an apartment building(2020-06-30) Arregi, Beñat; Garay-Martinez, Roberto; Astudillo, Julen; Ramos, Juan Carlos; Tecnalia Research & Innovation; EDIFICACIÓN DE ENERGÍA POSITIVAA bio-based multi-layer building envelope assembly has been developed for its integration in newly built and retrofitted buildings. Forest-based materials and biocomposite profiles are used as an alternative to fossil-based insulants and metallic framing, providing a well-insulated and low-thermal-bridge technical solution. The wall assembly has been installed as the external envelope of one apartment of a housing block in Donostia-San Sebastián (Basque Country, Spain). A comparative study has been performed for the bio-based wall and the reference wall of the building. Their in-situ thermal resistance has been obtained by means of three different methods: (1) the steady-state average method, (2) a semi-dynamic method from heat balance at the internal surface, and (3) a dynamic multiple regression method. Reasonably consistent results have been obtained with the three methods: a discussion is provided on the influence of measuring periods and boundary conditions. Outputs from this experimental campaign are valuable as a counterpoint to desktop studies and tests under controlled laboratory conditions. Learnings and outputs from the present study should contribute to a better understanding of the in-situ performance of building envelope assemblies and their assessment methods.Item New Biocomposites for Innovative Construction Facades and Interior Partitions(2018-06-20) Astudillo, Julen; Garcia, Miriam; Sacristan, Javier; Uranga, Nayra; Leivo, Markku; Mueller, Michaella; Roig, Inma; Langer, Sarka; Gemignani, Gianluca; Vilkki, Markku; Gijzen, Ger; Silva, Susana; Nuñez, M. A.; Dabek, Michal; Sprenger, Marius; De Elgea, Alberto Ortiz; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓNOsirys is a European Research Project where a holistic solution lor façades and interior partitions ready to be applied in building retrofitting and new construction has been developed. The project uses biocomposites as the base material to define different products: a multilayer façade, a curtain wall, a window, and an interior partition. The biocomposites developed have different functionalities able to meet the strictest requisites of the European Building Codes in relation to fire and structural performance, improve indoor air quality through the elimination of VOCs (volatile organic compounds) and microorganisms, increase thermal insulation, and increase the durability of construction elements. The new systems are lighter than traditional ones, leading to reductions in overall weight, thereby reducing implementation costs during both manufacturing and assembly processes, thanks to an industrialised concept that utilises modular elements. The project was developed with the collaboration of 18 European partners (5 research centres. 9 SMEs, 2 large industries, and 2 public bodies). The main activities were devoted to the establishment of requirements, the development of materials, the design of products, the integration of materials into products, the verification of properties by simulation and testing according to EU standards, the integration of products into real buildings, and economic and environmental assessment. The scope of this paper is to provide a general overview of the entire project work and results to demonstrate the feasibility of using biocomposites in envelope solutions with the aim of solving some of the main problems that exist in façade traditional solutions. The project finishes with the implementation of the developments in real buildings as prototypes: further research is required before industrial scale manufacturing of the systems can be launched into the market.