Thesis supervisor: Balázs Nagy
Location of studies (in Hungarian): Építőanyagok és Magasépítés Tanszék Abbreviation of location of studies: EOEM
Description of the research topic:
Nowadays, curtain walls and glass facades are becoming increasingly popular for new and modern buildings. Two possible designs for glass curtain walls are line bracing and point fixing, which are aesthetically pleasing solutions. Point-fixed curtain walls appeared around the 1970s. This type of facade differs from traditional curtain walls in that it does not use continuous support along the edge of the glass, allowing greater facade transparency. Point-fixed glass facades are aesthetically pleasing solutions that create a transparent, continuous, almost weightless surface between solid structures. Today's building physics and energy performance requirements also impose strict values on glass facades and curtain walls. However, there is currently no standardized thermal calculation procedure for point fixings and their heat loss compared to line supports. Therefore, these point thermal bridging structures need to be investigated through three-dimensional numerical thermal modelling and tools and methods to support the design of building physics in order to determine their impact on the building from both thermal and moisture performance aspects. It should be carried out independently of manufacturers, using parametric modelling of currently available fixing systems, so that the impact of individual components (e.g., insulating glazing, cavity formation, subconstructions) and structural designs (e.g., bolted, clamped, or concealed fixings) can be quantified and analysed. The results of numerical modelling should be verified by field or laboratory (e.g., thermographic) tests, and the models should be calibrated where necessary. In addition, the research should compare point-fixed glass facades with structural glazing facades from an energy point of view to determine each design's relative performance and the building's energy performance during operation.
The PhD research aims at a comprehensive building physics investigation of point-fixed glass facades and the identification of new scientific results by investigating the elements and designs that make up the structures, and the thermal and moisture resistance of connected building structures and building types, mainly based on numerical modelling. The numerical calculations will be validated by developing a methodology based on thermography, either on-site or in the laboratory. The research aims to develop simplified calculation procedures that can be used in industrial practice and proposals and a catalogue of thermal bridges to support manufacturer-independent design.
Research tasks:
- Create parametric models of point-fixed glass facades based on different manufacturers' catalogues and perform thermal numerical finite element modelling to determine the point and linear thermal transmittances. Analyse the results and compile thermal bridge catalogues to support design, and develop a simplified calculation procedure
- Develop and perform on-site or laboratory thermographic studies to validate numerical modelling and results
- Building physics testing and analysis of glass facades and connections to other building constructions (e.g., walls, floors, roofs)
- Energy performance modelling of typical buildings with different glass façades to compare various types of glass façades and analyse their impact on building operation and on moisture condensation and durability
Deadline for application: 2024-05-31
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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