Phd-forsvar: “INTELLIGENT GLAZED FACADES – AN EXPERIMENTAL STUDY”
Ph.d. studerende Frederik V. Winther, Institut for Byggeri og Anlæg, forsvarer sin afhandling “INTELLIGENT GLAZED FACADES – AN EXPERIMENTAL STUDY”. Alle interesserede er velkomne.
14.05.2013 kl. 10.00 - 13.00
Glazed facades are becoming an increasingly dominant choice of facades for office buildings. Glass has always been attractive and intriguing and has been a symbol of power, money and prestige. The façade is a mean of communicating an image of prestige and power. However, the possibility for analysis of glazed façade performance in relation to building energy use is lacking, often leading to higher energy demand for heating, cooling, etc. Therefore significant challenges have to be overcome to ensure that glazed facades remain an attractive envelope solution in future zero-energy-building concepts.
Through the use of energy and thermal building simulation software the initial analysis in this thesis strives towards defining the potential of dynamic control of the energy transport across the façade. The simple analysis defines the key technologies to focus on as a result. Full-scale experiments are carried out on each technology showing the performance of the technology under varying boundary conditions. The results are followed by a numerical model development of each technology for use in thermal building simulation software as well as in practical façade control systems.
The results from the initial analysis show that the performance of a dynamic façade enables variation of heat transfer, transmitted irradiance, transmitted natural light, mass transport and thermal energy storage.The results also show that the dynamic façade opposed to the static façade can decrease energy demand for building services by approximately 75 %. The full-scale experiments on dynamic U-value, dynamic g-value, thermal energy storage and control strategies for dynamic facades are used for validation of the performance of the developed numerical models. The developed numerical models show a good description of the applied technologies and show that the variation of the function of the technologies as well as their characteristics and performance can be reflected well in thermal building simulation software predictions. The façade control system, which uses the results from the developed numerical models of the dynamic facade technologies, shows a potential for lowering the energy demand for heating, cooling and lighting as a results of the heat transfer across the façade by between 50 % and 88 %.
The obtained results in the project - from the initial analysis through the developed numerical models to the final analysis - show that there is a significant energy saving potential in the design of a dynamic façade. Further development of dynamic façade technologies, which are able to control the energy balance across the façade is needed in order to investigate performance in practice and to gain knowledge of the human interaction with the adaptive glazed façade and control system.
The lecture is public and it will be given in English.
Sohngaardsholmsvej 57 room F108, 9000 Aalborg