Nouveaux systèmes de murs isolants en béton

in RF2B 2011 – 12ème édition des Journées scientifiques du Regroupement francophone pour la recherche et la formation sur le béton (2011)

Study of the vibrating stationary state of a sheet pile during a vibratory pile driving

in Proceedings of ISMA 2010 - International Conference on Noise and Vibration Engineering (2010, September 20)

Thermal comfort of a new university building in Luxembourg with passive cooling

in Thermal comfort of a new university building in Luxembourg with passive cooling (2010)

The new Luxembourgish university buildings should comply with a low energy standard, which was defined for typical offices and smaller lecture rooms by a thermal end-energy lower than 14 kWh/m3a and an ... [more ▼]

The new Luxembourgish university buildings should comply with a low energy standard, which was defined for typical offices and smaller lecture rooms by a thermal end-energy lower than 14 kWh/m3a and an electricity use for HVAC and lighting of max. 6 kWh/m3a. Consequently it was necessary to find ways to avoid the need for mechanical ventilation and air-conditioning. The heat consumption was minimized by an air-tight and well insulated building envelope. A difficulty was posed by special outside façade elements which were set-up as a grid over the complete outer surface as an architectural element. To prevent the risk of overheating during summer, it is necessary to reduce the solar gains by optimizing the window sizes and the glazing types, as well as through the installation of movable indoor shading elements. Nevertheless enough daylight should enter the rooms to limit the consumption of electricity for artificial lighting. Hence detailed dynamic simulations were performed using TRNSYS and TRNFLOW to ensure thermal comfort without active cooling. The effective electricity consumption of a newly installed state-of-the-art lighting system, including presence detectors and daylight controllers for dimming, was measured in a test installation to determine the internal loads by lighting. Radiation and illuminance measurements were performed on sample elements of the façade grid. The results were used to verify the daylight simulations and to analyze the benefits of daylight controllers. Several iterative steps were taken to gradually improve the building by introducing different modifications, e.g. reduction of the window sizes, installation of a lighting control system, improving the night ventilation and effective use of the thermal inertia of the building. [less ▲]

Dynamic simulations to develop a natural ventilation concept for an office building

in 8th International Conference on System Simulation in Buildings (2010)

The Sustainability Group of the University of Luxembourg defined for their new buildings a maximum thermal end-energy of 14 kWh/(m3a) and an electricity consumption for HVAC and lighting below 6 kWh/(m3a ... [more ▼]

The Sustainability Group of the University of Luxembourg defined for their new buildings a maximum thermal end-energy of 14 kWh/(m3a) and an electricity consumption for HVAC and lighting below 6 kWh/(m3a). Therefore it was necessary to avoid active cooling loads and mechanical ventilation in the offices and small lecture rooms. The well insulated and air-tight façade, including special outside shading elements which were designed as a grid over the complete building envelope, was an essential given architectural element of the building. Therefore further external shading devices were not applicable. The only possibility to have an influence on solar gains was to optimize the window size, the glazing type and potentially an internal shading device. Furthermore, to prevent the risk of overheating during the summer period, it was necessary to reduce the internal gains from lighting and IT-equipment. Hence detailed dynamic simulations using TRNSYS and TRNFLOW were done to evaluate the thermal comfort without air-conditioning and mechanical ventilation. The effects of optimizations like a state-of-the-art lighting control system or a window-based night ventilation, as well as the influence of the effective thermal inertia of the building were analyzed. The assumed natural ventilation rates were calculated by combining TRNFLOW and TRNSYS simulations and by the software LESOCOOL. [less ▲]

Design model for sfrc flat slabs with openings in the column area

in Abstract book of 3rd Congress of the International Federation for Structural Concrete (fib) (2010)

Dynamische Zustandsbewertung einer Verbunsbrücke: Beobachtung äußerer und nichtlinearer Einflüsse auf die modalen Eigenschaften

in Beton- und Stahlbetonbau (2010)

Entwicklung von hybriden Wärmedämmsteinen aus LAC

in Mauerwerk (2010), 14(1), 10-18

Determination of the rheological characteristics of Self-Compacting Concrete at different temperatures

in Abstract book of 3rd Congress of the International Federation for Structural Concrete (fib) (2010)

Untersuchung von verschiedenen Ausführungsvarianten von Abdeckplatten der Kabelkanäle des Tunnels "Grouft".

in BFT international : concrete plant + precast technology (2009), 75

Rheologie von SVB – Untersuchungen am Leim, Mörtel und Beton

in Tagungsbericht (2009)