Thomas Bednar
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View article: Digital Transformation in Tunneling – A Project Report on TransIT
Digital Transformation in Tunneling – A Project Report on TransIT Open
The digital transformation has significantly affected many industries. Recently, it has gained momentum in the Architecture, Engineering, and Construction (AEC) sector in general and tunneling in particular. To support these developments, …
View article: Development of Plugins for seamless Integration of the SIMULTAN Meta Data Model with IDA-ICE and RFEM 6
Development of Plugins for seamless Integration of the SIMULTAN Meta Data Model with IDA-ICE and RFEM 6 Open
SIMULTAN ComponentBuilder plugins enable individualized development of connections to simulation tools, easing data management of the simulation-driven interdisciplinary planning processes in civil engineering. The Software Development Kit…
View article: Characterizing the energy flexibility of districts using urban building energy modelling
Characterizing the energy flexibility of districts using urban building energy modelling Open
This study applies an automated UBEM approach based on detailed physical building models of archetypes to assess the energy flexibility of an use case district attributed to the thermal mass. The energy flexibility is implemented by means …
View article: Automated energy performance certificate based urban building energy modelling approach for predicting heat load profiles of districts
Automated energy performance certificate based urban building energy modelling approach for predicting heat load profiles of districts Open
Urban building energy modelling (UBEM) for analysing buildings in their spatial and functional context is an arising method. Only a few UBEM procedures use detailed building simulation tools, which are essential for high temporal and spati…
View article: Digital Twin applications using the SIMULTAN data model and Python
Digital Twin applications using the SIMULTAN data model and Python Open
Python is an open, general-purpose programming language that is used in many tools, libraries and APIs for Building Performance Simulations (BPS). Advantages of Python in the context of digital twins are the simple and powerful capabilitie…
View article: Hygrothermal simulation and risk evaluation - A literature review and assessment of the applicability of the Lattice Boltzmann Method to derive the influence of convection on moisture behaviour in building components
Hygrothermal simulation and risk evaluation - A literature review and assessment of the applicability of the Lattice Boltzmann Method to derive the influence of convection on moisture behaviour in building components Open
Since the Lattice Boltzmann Method (LBM) showed promising ways in describing fluid flow and convective phenomena, this literature review gives an overview of the application of LBM to date in the realm of hygrothermal simulations (HAM). Fu…
View article: Standardized Data Integration in the AEC Domains – What does it take to succeed?
Standardized Data Integration in the AEC Domains – What does it take to succeed? Open
Data models are the backbone of digital information exchange, since they contain the structure of data to be exchanged. Just as information requirements vary, so do data models – in level of detail, level of abstraction, and domain coverag…
View article: DATA-DRIVEN MODELLING OF THE ENERGY CONSUMPTION OF AIRPORT CITIES
DATA-DRIVEN MODELLING OF THE ENERGY CONSUMPTION OF AIRPORT CITIES Open
The airport city of Vienna International Airport consists of more than 125 energy-consuming objects mostly buildings but also infrastructure. In order to ensure their energy-efficient operation, digital models are needed that predict the e…
View article: Building stock characteristics of residential buildings in Salzburg, Austria based on a structured analysis of energy performance certificates
Building stock characteristics of residential buildings in Salzburg, Austria based on a structured analysis of energy performance certificates Open
Heating and cooling of residential buildings is accountable for a significant share of the EU’s final energy consumption. In order to determine the current condition of the building stock and to implement appropriate measures and requireme…
View article: A review on coupled building physics analyses
A review on coupled building physics analyses Open
This paper reviews methods and tools for coupled building physics analyses in the context of Building Performance Simulations (BPS) with a focus on Building Energy Simulations (BES) and Computational Fluid Dynamics (CFD) as a common applic…
View article: Hygrothermal simulation and risk evaluation - The impact of discretization on numerical results and performance
Hygrothermal simulation and risk evaluation - The impact of discretization on numerical results and performance Open
Regulations for modelling when deducting thermal simulations are represented in the standards [1]. However, the level of model detail regarding discretization in hygrothermal simulations and especially for evaluating the mould risk on surf…
View article: Comparison of indoor moisture excess in three different terraced housing projects
Comparison of indoor moisture excess in three different terraced housing projects Open
In this study three neighbourhoods of terraced houses have been investigated. In 16 to 29 houses of each project, indoor temperature and indoor humidity have been measured, inhabitants have been interviewed and Blower-Door Tests have been …
View article: The influence of suspended ceilings on the impact sound insulation of wooden-beamed ceilings in a Wilhelminian style house
The influence of suspended ceilings on the impact sound insulation of wooden-beamed ceilings in a Wilhelminian style house Open
The refurbishment of Wilhelminian style houses, driven by the densification of the living space, is increasingly leading to problems in the field of sound insulation. The high-quality refurbishment of the outer shell of the existing buildi…
View article: Influences on the drying behavior of a concrete ceiling below a cold attic
Influences on the drying behavior of a concrete ceiling below a cold attic Open
The article describes the current state of a project examining the influences on the moisture distribution in cold attics above concrete ceilings of residential buildings. Considerable research has been done on moisture damages in cold att…
View article: Leveraging integration facades for model-based tool interoperability
Leveraging integration facades for model-based tool interoperability Open
Data exchange and management methods are of paramount importance in areas as complex as the Architecture, Engineering and Construction industries and Facility Management. For example, Big Open BIM requires seamless information flow among a…
View article: Renovation and innovation using thermal insulation lining systems - Acoustic performance
Renovation and innovation using thermal insulation lining systems - Acoustic performance Open
Retrofit and design of thermal cladding systems provide an opportunity to improve the acoustic properties of a building. However, the complexity of the calculation process to predict sound insulation improvement may inhibit rather than enc…
View article: A parametric study of the acoustic properties of thermal cladding systems
A parametric study of the acoustic properties of thermal cladding systems Open
Thermal cladding systems have developed and modernised since the first systems were implemented, and predictions of single figure sound insulation improvement, ΔRW, based on the natural frequency, f0, of the spring-mass covering may no lon…
View article: Transition towards an energy-efficient scientific Office Setup in Austria’s largest (Plus-)Plus-Energy Office Building – an Analysis
Transition towards an energy-efficient scientific Office Setup in Austria’s largest (Plus-)Plus-Energy Office Building – an Analysis Open
Near the center of Vienna one can find the world’s first office tower which was designed to feed more energy into the power grid than is required to operate and use the building. This building is the result of the refurbishment of an over …
View article: Calculation of direct sound insulation of combined material (heavyweight and lightweight) double-leaf partitions using statistical energy analysis (SEA)
Calculation of direct sound insulation of combined material (heavyweight and lightweight) double-leaf partitions using statistical energy analysis (SEA) Open
International audience
View article: Improving Durability of Wooden Beam Bearings in Inside Insulated Walls by Tempering the Beam’s Heads
Improving Durability of Wooden Beam Bearings in Inside Insulated Walls by Tempering the Beam’s Heads Open
Improving durability of wooden beam bearings after a thermal renovation via interior insulation is highly demanding for planners. Because of an isolated thermal bridge in the area of the wooden beam head the risk of condensation water form…
View article: "Evaluating the hygrothermal performance of wooden beam heads in 19th century town houses using in-situ measurements"
"Evaluating the hygrothermal performance of wooden beam heads in 19th century town houses using in-situ measurements" Open
Improving the energy efficiency of typical 19th century townhouses in middle Europe the focus on the wooden beam bearing’s hygrothermal performance has become more and more important during the last years. There are several issues for the …
View article: Big-open-real-BIM Data Model - Proof of Concept
Big-open-real-BIM Data Model - Proof of Concept Open
The goal of Building Information Modeling (BIM) is the continuous use of digital construction models from the planning stage onwards. The affected processes are iterative and involve multiple stakeholders who work at varying pace and in va…
View article: Comparison of the planned and the real energy consumption of the world’s first (Plus-)Plus-Energy Office High-Rise Building
Comparison of the planned and the real energy consumption of the world’s first (Plus-)Plus-Energy Office High-Rise Building Open
The world's first office tower designed to feed more energy from renewable sources into the power grid than is required to operate and use has been built in the centre of Vienna. It is a refurbishment of an over 40 year old high-rise build…
View article: Hygrothermal performance of wooden beam heads in inside insulated walls considering air flows
Hygrothermal performance of wooden beam heads in inside insulated walls considering air flows Open
When planning an interior insulation for a building with existing wooden ceilings, the hygrothermal performance of the wooden beams' heads inside the masonry need special consideration. Because of airflows due to thermal differences in pre…
View article: Identification of the user Behavior Related Influence on the Estimated Energy Performance
Identification of the user Behavior Related Influence on the Estimated Energy Performance Open
One of the current problems of building planers and energy consultants is that the currently applied standards for the calculation of the energy performance of residential houses is inappropriate to estimate the individual user's future en…
View article: Experimental Determination of the Influence of Installing Fibrous Insulation Materials in Timber Frames on the Air Permeability and Convective Air Transport
Experimental Determination of the Influence of Installing Fibrous Insulation Materials in Timber Frames on the Air Permeability and Convective Air Transport Open
More than 300 samples of mineral wool were tested in this study. Air flowed through circular specimen in an adaptive testing facility. Six differently sized test vessels were filled with three differently sized samples each. Like in a real…
View article: Measuring the Hygrothermal Performance of an Interior Insulation Made of Woodfibre Boards
Measuring the Hygrothermal Performance of an Interior Insulation Made of Woodfibre Boards Open
This paper introduces two demonstration objects onto which various interior insulation systems made of woodfibre have been installed. Temperature and humidity sensors have been integrated in the respective constructions. Insulation systems…
View article: Validated Load Profiles in Terms of Density Functions for Residential and Non-residential Buildings in Order to Enhance the Simulation Capability in a Comprehensive Urban Simulation Environment
Validated Load Profiles in Terms of Density Functions for Residential and Non-residential Buildings in Order to Enhance the Simulation Capability in a Comprehensive Urban Simulation Environment Open
In order to maintain a sufficient performance and a time efficient duration within an entire urban simulation environment, the simulation efforts for single buildings supposed to be as low and as capable as possible. By generalizing all he…