1,721,346 research outputs found
CFD vs. lumped model applied to HAM: a comparison between HAM-Tools and Comsol
Get PDFCFD models have several advantages in comparison with zonal-models, due to the more accurate calculation of the airflow distribution within the built environment. Nevertheless, in currently available CFD software the simulation of mass transfer cannot be directly extended from the fluid region to the solid region. In the whole building moisture transport studies, the mass coupling between the indoor environment and the wall system is usually achieved by third party programming. The Annex 41 research project of the International Energy Agency (IEA) was carried out to explore the complex physics governing the whole building heat, air and moisture (HAM) transfer, by developing several models to couple 3-D CFD simulations with hygrothermal models of walls. The objective of this study is to develop a coupled CFD model able to simulate the HAM transport in a single environment (i.e. a simple test room), influenced by the room factors. A numerical method was utilized to model the indoor environment and the moisture transport process in the simple room and inside the wall system as influenced by the moisture loads and ventilation conditions. The comparison between the CFD and a lumped model allows us to demonstrate how a simplified model can be reliable in predicting the RH variation inside a room, also taking into account the indoor material buffering effec
BauSIM 2024 Companion Proceedings Vorwort / Preface
Get PDFDie 10te BauSIM, unter der Schirmherrschaft der International Building Performance Simulation Association Deutschland Österreich Schweiz (IBPSA-DACH), fand vom 23. bis 26. September 2024 in Wien statt und bot eine herausragende Gelegenheit für den wissenschaftlichen Austausch über die neuesten Entwicklungen im Bereich der Gebäude- und Quartiersimulation. Ein zentrales Thema der diesjährigen BauSIM war die Frage, wie moderne Simulationsmethoden dabei helfen können, die Herausforderungen im Bereich der Klimaneutralität und der Energieeffizienz zu bewältigen. Die vorgestellten Beiträge liefern wertvolle wissenschaftliche Erkenntnisse darüber, wie Simulationstechniken dazu beitragen können, den Energieverbrauch zu senken, den Einsatz erneuerbarer Energien zu optimieren und die thermische Behaglichkeit in Gebäuden und Quartieren zu gewährleisten. Dieser Band umfasst 37 Beiträge (20 Shortpaper, 17 Poster) und rundet die Full-Paper Proceedings (ISBN: 978-3-200-10068-8, doi:) ab. Die Beiträge befassen sich unter anderem mit Projekten und Erkenntnissen aus innovativen Ansätzen zur nachhaltigen Gebäudeplanung und -sanierung. Es geht um die Nutzung von Abwärme, intelligente Energieregelsysteme, Einsatz von BIM zur Optimierung von Gebäudetechnologien, Deep Learning für digitale Bestandsaufnahmen und Methoden zur Verbesserung der Energieeffizienz. Ein Fokus liegt dabei auf CO2-Reduktion, Lebenszyklusanalyse und Simulationen von Energieeffizienz. Die Beiträge zeigen eine enge Verzahnung von Bauphysik, Technischer Gebäudeausrüstung und Simulationsmethoden und unterstreichen die Relevanz interdisziplinärer Ansätze zur Lösung komplexer Herausforderungen. Wir danken allen Autorinnen und Autoren, die mit ihren Arbeiten nicht nur Erkenntnisse mit der Community teilen, sondern auch Forschungsimpulse und praktische Lösungen liefern um Herausforderungen der gebauten Umwelt in der Zukunft zu meistern
Metamodels: Built-In BIM Compliance Checking
Get PDFMaking sure that Building Information Modelling (BIM) models comply with building codes and contractual requirements is typically a time-consuming and overhead-heavy task. For this reason, there is a push for its automation. However, there are significant challenges to overcome. For example, most technical guidelines and contractual requirements are formulated in a natural language and would need to be translated into a formal representation for digital processing. Furthermore, there is no formal mechanism that enables the declaration, enforcement, and verification of compliance to those in a BIM model. In this work, we present a fundamental approach that makes the last three possible at any level of granularity, i.e., throughout the building’s entire life cycle
Measuring airflow in a gap-Prototyping an experimental setup and test measurements
Get PDFThe research department of Building Physics at TU Wien is currently trying to enhance numerical methods to quantify advective moisture transport in building components due to unwanted forced and natural convection. This poster shows the motivation and current state of these developments as well as the experimental setup. Furthermore, challenges and future steps are highlighted
From Conceptual Model to Detailed Geometry
Get PDFIn this work we present a method for the automatic advancement of the LOG of a BIM model from LOG100 to LOG300 or LOG400 by means of SIMULTAN, Rhinoceros® and Grasshopper. We start with a conceptual model comprised of volumes representing functional or energy-based zoning. Each face, edge, and vertex along the volume’s boundary can be assigned a predefined detailed surface or joint construction. These stem from a standardized Rhinoceros® library of details. Once all assignments are performed, the volume’s boundary is generated with full detail, taking column and beam spacing and surface openings into account and adapting the standardized models to the specific geometry of the volume. This makes quick adaptations and comparison of the applicability of different details quite quick and straightforward
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Towards Open Modeling of Building Automation over the entire building life cycle
Get PDFOne step towards achieving climate neutrality in cities is to operate buildings energy-efficiently. Building automation systems are a key element in optimizing the operation of modern buildings (e.g., controling HVAC systems and switching lights on/off). However, it is often the case that the actual energy consumption of a building is higher than expected. One reason is that building automation is usually only designed in detail very late during the construction phase of buildings. Consequently, the design assumptions often differ from the actual realization, which leads to operational failures and inefficiencies. As a result, the total savings potential cannot be exploited for time and budget reasons. Hence, building automation should be modeled and tested already in the design phase to avoid insufficiencies in the implementation, resulting in higher operational costs and energy consumption.
To address these challenges, we developed a method for platform-independent modeling of the control logic and integrating it into an open data model. This method allows the control logic to be linked to the components and parameters of the building model already in the design phase and throughout the entire building life cycle
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