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A.A.H. Ahmadalshteihi, U. Pont, A. Mahdavi:
"The Application Potential of Vacuum Glazing in Building´s Thermal Retrofit: A Case Study";
Talk: enviBUILD2017 - Buildings and Environment - From Research to Application, TU Wien, Vienna, Austria; 2017-09-07 - 2017-09-08; in: "12th international enviBUILD conference 2017 - Buildings and Environments - From Research to Application", U. Pont, M. Schuss, A. Mahdavi (ed.); Department of Building Physics and Building Ecology, TU Wien, (2017), 22.

Vacuum glazing is considered as a viable alternative for improvement of transparent components of the building envelope in the course of thermal building retrofit. Research and development efforts in the past decades focused on the vacuum glazing itself. Thereby, research targeted the development of durable edge sealing and selecting suitable materials for spacers in the vacuum between the two glass panes. However, the availability of durable vacuum glass is only the first step toward energy-saving transparent building components. The next step is to think about window constructions that consider the specific requirements of vacuum glazing. While new windows can be constructed from scratch to meet these requirements, this does not apply to the windows of existing buildings. Thus, the impact of vacuum glazing in existing window constructions has to be thoroughly evaluated. This contribution describes the method and results of a case study that focused on the implementation of vacuum glass in a number of window frames typical to the building stock in Central Europe. To assess the thermal performance of such assemblies, numeric thermal bridge simulation was deployed. Based on the results of a number of implementation scenarios, key performance indicators for building details as well as for overall building energy performance were derived. Subsequently, the results were utilized in simple economic calculations to explore the overall sustainability of such window retrofit measures.

(no german version) Vacuum glazing is considered as a viable alternative for improvement of transparent components of the building envelope in the course of thermal building retrofit. Research and development efforts in the past decades focused on the vacuum glazing itself. Thereby, research targeted the development of durable edge sealing and selecting suitable materials for spacers in the vacuum between the two glass panes. However, the availability of durable vacuum glass is only the first step toward energy-saving transparent building components. The next step is to think about window constructions that consider the specific requirements of vacuum glazing. While new windows can be constructed from scratch to meet these requirements, this does not apply to the windows of existing buildings. Thus, the impact of vacuum glazing in existing window constructions has to be thoroughly evaluated. This contribution describes the method and results of a case study that focused on the implementation of vacuum glass in a number of window frames typical to the building stock in Central Europe. To assess the thermal performance of such assemblies, numeric thermal bridge simulation was deployed. Based on the results of a number of implementation scenarios, key performance indicators for building details as well as for overall building energy performance were derived. Subsequently, the results were utilized in simple economic calculations to explore the overall sustainability of such window retrofit measures.

Vacuum Glazing, Efficiency Evaluation, Building Construction, Thermal Building Retrofit, Numeric Thermal Bridge Simulation

http://bpi.tuwien.ac.at/envibuild/enviBUILD2017_book_of_abstracts.pdf