Thesis supervisor: Balázs Nagy
Location of studies (in Hungarian): Építőanyagok és Magasépítés Tanszék Abbreviation of location of studies: EOEM
Description of the research topic:
In Central Europe, a significant part of the existing building stock is constructed using traditional technologies that were widespread in the 19th and 20th centuries. Vertical load-bearing structures are mostly masonry construction. In the early 1800s, timber slabs and arches were the main horizontal load-bearing structures, and in the second half of the century, various slabs made of bent steel beams appeared. By the 1910s, the material is known today as reinforced concrete had evolved, and in the following decades, the world wars led to attempts at prefabrication and the development of prestressed and formwork slab systems. Due to a lack of quality building materials, it was common practice to build structures using materials that were not specified and not following the prescribed layering scheme, so even a simple renovation project could typically be problematic. Climate change and drastically diminishing energy supplies have led to an increasing number of experts working on thermal and hygrothermal simulation of building structures and buildings. At present, however, solutions for coupled heat and moisture transfer modelling are only at an initial stage, there are no comprehensive simulation solutions complemented by material tests and, apart from the determination of the heat transfer coefficient, there is currently no literature and no comprehensive research on either the linear thermal transmittance t or the moisture transfer, apart from a few publications. In addition to thermal transmittances, the calculation of heat losses in our buildings could also take into account the effect of thermal bridges and moisture bridges, described using the linear heat and moisture transmittances, at locations where multidimensional heat and moisture flows develop in the building constructions relative to the surrounding structures. Numerical simulations of the distribution of humidity and temperature inside buildings can be used to determine the behaviour of a building element during its life cycle, which can facilitate, among other things, the maintenance of architectural heritage and the design of renovations for energy efficiency.
The PhD research aims to determine the key material properties of traditional building structures, which were the most common in Central Europe in the 19th-20th century, through field and laboratory tests, to investigate and analyse the building structures through hydrothermal simulations, and to draw new scientific conclusions. The results of this research could contribute to the more sustainable, economic and optimised reconstruction and renovation works in terms of moisture and durability.
Research tasks:
- On-site and laboratory investigation and comparative analysis of the material properties of building materials in historic building constructions for hygrothermal modelling
- Parametric and multiphysical simulation and analysis of historic building constructions (heat and moisture transport, airflow in hollow structures)
- Thermal, moisture, and durability analysis of the construction joints of historic building structures, assessment of their potential for reconstruction and renovation for energy efficiency, development of design recommendations and simplified calculation possibilities
- Typology-based modelling of historic buildings, investigation of reconstruction and energy efficiency renovation options, development of design recommendations
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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