Papers by Julen Astudillo
Sustainability, Jan 31, 2024
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
DOAJ (DOAJ: Directory of Open Access Journals), Jun 1, 2018
With this new edition we continue the collaboration with our funding member Tecnalia and the Inte... more With this new edition we continue the collaboration with our funding member Tecnalia and the International Congress on Architectural Envelopes (www.icae2018.eu), which they organise every 3 years in San Sebastian (Basque Country, Spain).
Automation in Construction, Jun 1, 2022
Energy and Buildings, May 1, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
E3S web of conferences, 2020
A bio-based multi-layer building envelope assembly has been developed for its integration in newl... more A 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.
Automation in Construction
Physica A: Statistical Mechanics and its Applications, 2018
Thermal conductivity of an electron gas with non-standard dispersion relations is studied by usin... more Thermal conductivity of an electron gas with non-standard dispersion relations is studied by using the Fermi-Dirac statistics. To that end, a cubic transmission line to model a left-handed system and its corresponding righthanded system is used. The heat capacity and the group velocity for both systems are obtained and studied, allowing to discern the behavior of thermal conductivity in the high and low temperature limits. Analytical expressions for these limits are obtained and a numerical analysis that supports the results is performed.
CIC: publicación mensual sobre arquitectura y construcción, 2018
CIC: publicación mensual sobre arquitectura y construcción, 2018
Proceedings of the 37th International Symposium on Automation and Robotics in Construction (ISARC), 2020
The installation of curtain wall modules (CWMs) is a risky activity carried out in the heights an... more The installation of curtain wall modules (CWMs) is a risky activity carried out in the heights and often under unfavorable weather conditions. CWMs are heavy prefabricated walls that are lifted normally with bindings and cranes. High stability is needed while positioning in order not to damage the fragile CWMs. Moreover, this activity requires high precision while positioning brackets, the modules, and for that reason, intensive survey and marking are necessary. In order to avoid such inconveniences, there were experiences to install façade modules in automatic mode using robotic devices. In the research project HEPHAESTUS, a novel system has been developed in order to install CWMs automatically. The system consists of two subsystems: a cable driven parallel robot (CDPR) and a set of robotic tools named as Modular End Effector (MEE). The platform of the CDPR hosts the MEE. This MEE performs the necessary tasks of installing the curtain wall modules. There are two main tasks that the CDPR and MEE need to achieve: first is the fixation of the brackets onto the concrete slab, and second is the picking and placing of the CWMs onto the brackets. The first integration of the aforementioned system was carried out in a controlled environment that resembled a building structure. The results of this first test show that there are minor deviations when positioning the CDPR platform. In future steps, the deviations will be compensated by the tools of the MEE and the installation of the CWM will be carried out with the required accuracy automatically.
Osirys is a European Research Project where a holistic solution for facades and interior partitio... more Osirys is a European Research Project where a holistic solution for facades 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 facade, 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 collab...
Dear Scientists, Engineers, and Designers, With this new edition we continue the collaboration wi... more Dear Scientists, Engineers, and Designers, With this new edition we continue the collaboration with our funding member Tecnalia and the International Congress on Architectural Envelopes (www.icae2018.eu), which they organise every 3 years in San Sebastian (Basque Country, Spain). The eleven articles found in this new issue were carefully selected from 50 abstracts that will be presented during the scientific section of the congress. The final selected papers were subjected to the regular double-blind review process of the journal. With this selection of papers, we want to give an overview of the traditional technologies that are normally discussed in the context of facades, while also making some mention of new technologies, which, some time ago, existed only in the realm of the laboratory but which have begun to appear in real buildings and construction in recent years. In fact, the main topic of the conference this year is the Envelope 4.0, and consequently the aim of the magazi...
Energy and Buildings, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Conarquitectura Arquitectura Con Arcilla Cocida, 2006
E3S Web of Conferences, 2020
A bio-based multi-layer building envelope assembly has been developed for its integration in newl... more A 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 e...
Journal of Facade Design and Engineering, 2015
Solar walls can be used to increase the overall energy efficiency of a building. Phase Change Mat... more Solar walls can be used to increase the overall energy efficiency of a building. Phase Change Materials (PCM) are capable of increasing the effective thermal mass of building elements, thus decreasing the overall energy consumption. Recently, the incorporation of PCM in a solar wall has been proposed, aiming to increase the total energy efficiency of the system. The main scope of this work is to investigate the thermal behaviour of a PCM-enhanced solar wall (PCMESW), using experimental and numerical simulation techniques. A prototype PCMESW is installed in a large-scale test facility and is exposed to dynamically changing climate conditions. A broad range of sensors, used to monitor the time-evolution of several important physical parameters, is employed to assess the dynamic response of the PCMESW. In addition, a Computational Fluid Dynamics tool is used to numerically investigate the thermal behaviour of the PCMESW prototype. Predictions of the developing flow-and thermal-field in the PCMESW's air cavity are validated by means of comparison with the obtained measurements; in general, good levels of agreement are observed. Results of the numerical simulations may support the design optimization process of innovative PCMESW systems.
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Papers by Julen Astudillo