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October 2019 - June 2023
March 2017 - September 2019
February 2014 - February 2017
Education
February 2014 - September 2019
September 2012 - September 2013
September 2012 - January 2014
Publications
Publications (71)
![Figure 2. The FEC of households by purpose [PJ] [3]](profile/Balazs-Nagy-4/publication/389124415/figure/fig2/AS:11431281310705822@1739958772025/The-FEC-of-households-by-purpose-PJ-3_Q320.jpg)
![Figure 3. Share of renewable energy by intended use [%] [15]](profile/Balazs-Nagy-4/publication/389124415/figure/fig3/AS:11431281310735394@1739958772155/Share-of-renewable-energy-by-intended-use-15_Q320.jpg)
![Figure 9. Measured temperatures [°C]](profile/Balazs-Nagy-4/publication/389124415/figure/fig4/AS:11431281310705823@1739958772284/Measured-temperatures-C_Q320.jpg)
![Figure 10. Measured heat flux [W/m 2 ]](profile/Balazs-Nagy-4/publication/389124415/figure/fig5/AS:11431281310705824@1739958772420/Measured-heat-flux-W-m-2_Q320.jpg)
The energy refurbishment process involves an initial data collection which is mandatory during the building diagnostics phase. In this paper we address the building construction and materials, technical parameters, building location and form. The main goal is to set up a framework through examples of data collection methods for holistic energy refu...
Hungary's building stock, primarily constructed in the 19th and 20th centuries from traditional masonry, includes bricks of varying quality and material properties. Current renovation legislation mandates compliance with thermal requirements, but aged materials' thermal properties are often unknown, complicating energy conformity verification. This...
Induction heating is a clear, cheap, and highly effective technology used for many industrial and commercial applications. Generally, a time-varying magnetic field produces the required heat in the workpiece with a specially designed coil. The efficiency of the heating process depends highly on the coil design and the geometrical arrangement. A det...
The construction industry is among the largest energy-consumer and waste-generating sectors, and it needs sustainable methods and materials to decrease its carbon footprint. One possible solution is to use secondary raw materials and crops as a basis for thermal insulation materials or passive buffers of moisture. This article presents the results...
Existing guides on refurbishing buildings to nZEB standards mainly focus on using conventional thermal insulation materials, such as polystyrene, polyurethane, or mineral wool. However, these popular thermal insulations have relatively high embodied environmental impacts. Moreover, their waste is long-lasting, and their recycling is currently uneco...
Assessment of energy performance became a necessary part of everyday architectural design as the building stock is a significant energy consumer. Different stages of a project require different granularities of evaluation. Typically, as the project moves forward, the level of geometry (LOG) of the digital assets increase, which proposes minor issue...
Climate change is recognized as a major contributor to the increase in heat-related deaths, and the frequency of heatwave days is expected to continue rising in the future. Addressing the impacts of climate change is a critical component of the United Nations' sustainable development goals, emphasizing the need for urgent action. To aid decision-ma...
The use of glass waste in the construction industry has a high potential of leading to a higher recycling percentage. Foam glass aggregate (FGA) is around 98% recycled glass waste of various origins and has good insulation properties with big grain size distributions ranging between 10 mm and 60 mm. FGA has a wide range of applicability in the cons...
In the presented research, barley- and wheat straw, waste glass and waterglass were used as the primary raw materials for developing bio-based thermal insulation. An analytic-empirical model was developed to describe the heat transfer process in raw straw bulks based on laboratory experiments dealing with the properties of individual natural straw...
The prevalence of ventilated façades is not only due to their aesthetics but because they provide mechanical and acoustic protection for the façade and can increase energy-efficiency. However, point thermal bridges of the fastening system with brackets and anchors are often neglected during energy calculations. The reason practitioners do not consi...
An empirical model was developed to estimate the thermal conductivity of heat-treated straw bulks based on laboratory experiments. During the measurements, two different types of straw were investigated, barley and wheat. Barley was used to composing our empirical model and define the influencing model parameters, and wheat straw was used for valid...
![Heat transfer coefficients based on thermal bridge catalogues [4, 6].](profile/Balazs-Nagy-4/publication/370351843/figure/tbl1/AS:11431281169823168@1687458358505/Heat-transfer-coefficients-based-on-thermal-bridge-catalogues-4-6_Q320.jpg)
We need to consider linear heat losses due to thermal bridges for the accurate calculation of building heat losses. Our research examined a whole building, and different thermal bridge calculation methods were compared. The following techniques were included in the study: a simplified method according to the Hungarian energy performance regulation...
The construction industry is currently one of the least digitised. However, due to recent technological developments, building information modelling and management (BIM) systems are increasingly being used to increase the efficiency of constructions and sustainable use of resources and increase the energy efficiency of buildings. In the case of new...
Occupant behaviour is a field, that has always been of great interest to researchers. It could significantly modify the operation of the building and the user’s energy needs, and it is also difficult to model it according to reality. Evaluation of measurements is a crucial step to calibrate dynamic simulations. Our goal was to analyse the indoor co...
Dynamic building energy performance modeling is becoming increasingly important in the architectural, engineering, and construction (AEC) industry because of the sector’s significant environmental impact. For such analysis, a climate file representing a typical meteorological year (TMY) is needed, including hourly values for the most important weat...
In this study, a BIM-based building physics modelling of a ventilated façade of a multistorey residential building was made to obtain the thermal performance of the construction. The workflow is performed in an open BIM environment using Archicad to create the model and Comsol Multiphysics for performing the numerical simulations. After creating a...
With the climate change we are experiencing today, the number and intensity of heatwaves are increasing dramatically, significantly impacting our buildings’ overheating. The majority of the prefabricated concrete panel buildings in Hungary are considered outdated from an energy point of view. These buildings may be at greater risk from extreme weat...
The paper presents the development process of an innovative, prefabricated compact house, which aims at creating a net zero greenhouse gas emission building design over the whole life cycle. Building Information Modelling helped to quantify the required building materials. Dynamic building simulations were performed in DesignBuilder to calculate th...
The prevalence of ventilated façade systems is not only due to their aesthetic properties but also due to the fact they provide mechanical and acoustic protection for the façade and reduce the energy demand of the building. However, it is essential to mention that the point thermal bridges of the fastening system with brackets and anchors are often...
Global Warming Potential (GWP) is one of the most important Life Cycle Assessment (LCA) indicator, which shows how much heat a greenhouse gas traps in the atmosphere relative to carbon dioxide. In this study, we calculated the GWP of a highly insulated building construction detail of a residential nearly-zero energy building (nZEB) based on numeric...
Foam glass aggregates are used as a lightweight material in various civil engineering applications due to their big granular nature. Investigating the impact of compaction ratio, loading period, and environmental condition on the compressional behavior of the material is highly appreciated. In this study, after examining the pore microstructure and...
The energy performance directive mandates that all new buildings in Europe shall be "nearly zero energy" buildings. New, innovative solutions have arisen both on the demand and on the supply side of the market that aim at much more ambitious energy and environmental performance levels than nearly zero at an affordable price. The basic principle of...
Building material manufacturers have already started to develop new products to prepare for the nearly zero energy performanc e requirements. These new requirements have severe effects on the masonry industry, which started developing and introducing new and reinvented products in recent years and started producing masonry blocks filled with therma...
An analytic-empirical model was developed to describe the heat transfer process in raw straw bulks based on laboratory experiments for calculating the thermal performance of straw-based walls and thermal insulations. During the tests, two different types of straw were investigated. The first was barley, which we used to compose our model and identi...
In order to mitigate the consequences of climate change, and in the view of increasingly stringent energy performance requirements, energy-efficient refurbishment of building constructions is extremely important. Double-skin roof constructions have been analysed in the case of pitched roofs or flat roofs without refurbishment in the past; thus, we...
In Central-Europe, a large proportion of people live in prefabricated tower blocks (most commonly called as panel buildings) which were built in the past 30-50 years. These buildings are now obsolete in terms of their energy performance and their condition has deteriorated, therefore they need to be refurbished, which action already started in the...
Fired clay masonry blocks are one of the most common building elements in Europe to construct thermal envelopes of buildings. However, due to current energy performance requirements, thermal insulation of buildings has become inevitable. Brick producers, therefore, started to develop their products and, as a possible solution, they come up with the...
Poultry has become the primary source of dietary protein consumed globally and as a result the by-product feathers are an increasingly problematic industrial waste. Developing a circular economy for feathers is, therefore, an important research area that provides an opportunity to make use of the unique combination of properties of this abundant na...
The environmentally friendly thermal insulations are more and more popular, but most of them have very poor insulation performance. The commonly used materials (mineral wools, polymer foams) have better performance, but they also have higher price end bigger environmentally footprint. In the future need an environmentally friendly alternative which...
The frequency and magnitude of summer heatwaves has significantly increased in Hungary in recent years, and research shows that we can expect the same level of temperature anomalies in the near future. For this paper we performed dynamic simulations of nursing homes to examine the effect of building types and construction methods on summer overheat...
![Figure 5: Temperature [°C] distribution of a wall corner in January,...](profile/Balazs-Nagy-4/publication/340645015/figure/fig3/AS:880438994296832@1586924422016/Temperature-C-distribution-of-a-wall-corner-in-January-Budapest-made-of-PUR-a-and_Q320.jpg)
![Figure 6: Heat flux magnitude [W/m 2 ] distribution of a wall corner in...](profile/Balazs-Nagy-4/publication/340645015/figure/fig4/AS:880438994280453@1586924422041/Heat-flux-magnitude-W-m-2-distribution-of-a-wall-corner-in-January-Budapest-made-of_Q320.jpg)
![Figure 7: Relative humidity [1] distribution of a wall corner in...](profile/Balazs-Nagy-4/publication/340645015/figure/fig5/AS:880438994296833@1586924422066/Relative-humidity-1-distribution-of-a-wall-corner-in-January-Budapest-made-of-PUR-a_Q320.jpg)
Building material manufacturers have already started to develop new products to prepare for the nearly zero energy performance requirements, which will have serious effects on the masonry industry. In recent years, masonry manufacturers started to produce blocks filled with thermal insulation material to increase the thermal resistance of bricks, a...
This paper reports on new thermal insulation packaging materials made from feathers. Clean and disinfected feathers from the poultry industry have been processed into fibres and air laid using commercial pilot-plant facilities to form non-woven feather fibre composite mats. This process can produce materials with different thickness and density by...
The duration and frequency of summer heatwaves in Europe have substantially increased recently due to climate change. A clear correlation can be shown between the rise in outside temperature and the risk of mortality. The aim of our research is to examine the nursing homes in Budapest from this point of view. Therefore, a survey was conducted in wh...
Energy efficient buildings are unimaginable without highly insulating thermal envelopes. Mineral wool among others is a popular material for thermal insulation. Architects and engineers usually use the data given by the manufacturer in the specification of the material for their building physical design. Such data are obtained from laboratory measu...
Due to increasingly stringent requirements in building energy performance, further development of fired clay masonry blocks are essential nowadays for the manufacturers. One of the possible directions for improving thermal performance of the masonry blocks is to fill them with insulating materials. The currently developed bricks are most commonly c...
In recent years, thermal insulation filled masonry blocks have become widespread in Central-Europe. These blocks can satisfy thermal performance requirements without the need of additional insulation. However, these requirements in the building regulations only consider thermal, but neglect moisture aspects. This paper presents a comparative analys...
Nowadays huge amount of thermal insulation materials have to be produced. Materials with high performance have high price, and the most popular thermal insulations have large environmental footprint and these are not able to biodegradation and their production needs high energy investment [1, 2]. One alternative the use of natural based biodegradab...
In accordance with nowadays building energy performance requirements, building constructions developed significantly in the past few years due to new construction materials and building elements, because of the need for increased thermal insulation layers and the development of new building technology solutions. However thermal performance requirem...
The paper discusses an experimental hygrothermal analysis of differently constructed additional mineral wool wall and attic insulation of a family house in Hajdúnánás, Hungary. The walls of the building were insulated in two different ways: half of the façade was insulated with Knauf stone mineral wool insulation boards glued to the walls in a cont...
Due to current energy performance requirements, masonry block producers developed thermal insulation filled masonry blocks to achieve lower thermal transmittance. However, the internal structural geometry of these blocks remained simple: producers mostly using only large rectangular hollows to fill with different insulating materials, such as miner...
The aim of the paper is primarily to evaluate the heating energy demand of an industrial hall. In the study, we have made multidimensional dynamic whole building simulations for describing coupled heat and moisture behaviour and energy consumption of the building with different internal loads and compared to the calculated energy consumption of the...
The paper discusses the analysis of an insulated and an uninsulated residential building based on in-situ measurements and calibrated numerical simulations. We monitored the energy consumption, temperature and humidity conditions in two family houses with residents living inside during a heating season in Hungary. To calibrate the simulation, we tr...
Papers presented at the conference in Ghent 28-29th August 2018.
Contents page only with links to papers. Papers are priced, generally.
![Figure 5. Relative humidity [1] in windows sill construction joints...](profile/Balazs-Nagy-4/publication/325406028/figure/fig2/AS:641405240233986@1529934334609/Relative-humidity-1-in-windows-sill-construction-joints-with-insulated-facade-wall-with_Q320.jpg)
In accordance with current energetic requirements, building construction joints developed significantly in the past few years due to new construction materials and building elements, due to the need for increased thermal insulations and the development of new building technology solutions. Window constructions also developed significantly, however,...
The paper analyses the monitoring measurement results on energy performance and hygrothermal behaviour of built-in rock and glass mineral wool thermal insulations in an energy efficiently refurbished typical single-family dwelling house in Hungary. The experimental monitoring measurements included an external weather station; internal air condition...
![Fig. 1. Mineral wool filled masonry blocks [3].](profile/Balazs-Nagy-4/publication/325784775/figure/fig1/AS:637775988674560@1529069053140/Mineral-wool-filled-masonry-blocks-3_Q320.jpg)
![Table 2 . Water content [kg/m 3 ] according to relative humidity.](profile/Balazs-Nagy-4/publication/325784775/figure/tbl2/AS:670476556832772@1536865476182/Water-content-kg-m-3-according-to-relative-humidity_Q320.jpg)
Ceramic brick as building material has been used for thousands of years. Nowadays, the energy performance of new products has to meet rigorous requirements; therefore, in the design of new ceramic masonry blocks, building physical simulations are essential. The aim of this research is to evaluate existing masonry block shapes filled with different...
The aim of the paper is to investigate the hygrothermal properties of a newly developed building panel, made of ultra-lightweight concrete, encased cold-formed steel elements. It describes the hygrothermal simulations of the wall and roof panels, and based on results, the heat transfer coefficients and linear thermal transmittances are determined....
The aim of the paper is to investigate the hygrothermal properties of a newly developed ultra-lightweight polystyrene concrete, based on laboratory measurements. It describes the measuring process of thermal conductivities, and determines the declared thermal conductivity. The temperature and moisture conversion coefficients are determined, and new...
Energy efficiency aspects are rarely considered during practical structural design. In building energetic calculations, thermal conductivity values from EN ISO 10456:2008 [1] are mainly used, although the standard define concrete’s values only by taking into account the density and the approximate percentage of reinforcement. Details of the structu...
In this paper a conjugated heat and moisture transport investigation of industrial floors is presented. We have analyzed 2D general segments of wall and foundation connections in three different climatic conditions: Budapest (Hungary), Lisbon (Portugal) and Espoo (Finland). We also modeled the component with horizontal or vertical edge insulations...
In this research, conjugated thermal and fluid dynamics simulations are presented on a modern hollow clay slab blocks filled pre-stressed reinforced concrete beam slab construction. The simulation parameters were set from Eurocode standards and calibrated using data from standardized fire tests of the same slab construction. We evaluated the temper...
Nowadays energy-and comfort-conscious design approach of buildings necessitates the development of the masonry blocks as well. The building blocks with different internal structures and various fillers are rapidly spread the market. The study deals with heat and moisture migration problems within these blocks. The aim of the research is to analyse...
This paper defines the hygrothermal material properties (thermal conductivity, density, specific heat capacity, vapor diffusion coefficient and resistance, moisture storage function, water absorption coefficient and liquid transport coefficient) of steel fiber reinforced concretes that are widely used for industrial floors, based on laboratory meas...
![Fig. 2. Development of hollow bricks [3]](profile/Balazs-Nagy-4/publication/288688333/figure/fig1/AS:315370473836546@1452201588385/Development-of-hollow-bricks-3_Q320.jpg)
Clay brick as building material has been used for thousands of years. Nowadays, the energy performance of new products has to meet rigorous requirements, therefore in design of fired clay blocks, building physical calculations and optimization are essential. The aim of this research is to design optimized fired clay building blocks using numerical...
The heat loss at ground contact structures is taken into consideration in building heat loss calculations. However, the heat loss through the ground depends not only the soil and the building structure, but the environment as well. New calculation methods based on parametrized transient finite element thermal modelling are introduced in the precedi...
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The heat loss at ground contact structures is taken into consideration in building heat loss calculations. However, the heat loss through the ground depends not only the soil and the building structure, but the environment as well. New calculation methods based on parametrized transient finite element thermal modelling are introduced in the prec...
The heat loss at ground contact structures is taken into consideration in building heat loss calculations. However, it implies uncertainties due to the physical properties of the soil as well as the building structure. In this paper, new methods are introduced for calculating the heat loss at ground contact structures. Firstly, it examines the pres...
The aim of the paper is to define the thermal properties (thermal conductivity, density and specific heat capacity) of steel, plastic and glass fiber reinforced concretes that are widely used for industrial floors, and to determine equivalent concrete thermal conductivity values for numerical thermal modelling of steel fibre reinforced concretes. I...
![Figure 3. Sections of the pitched roof element for 2D FEM simulation [5]](profile/Balazs-Nagy-4/publication/269809334/figure/fig3/AS:295153349742595@1447381450821/Sections-of-the-pitched-roof-element-for-2D-FEM-simulation-5_Q320.jpg)
This paper contains a comparative analysis of multi-dimensional heat flow modeling methods, and examines the calculated results changing by the model's dimension reduction. The possibilities of two heat flow modeling methods are also tested in order to identify the method that should be applied for a complex model at heat conduction problems. In th...
The heat loss at ground contact structures is taken into consideration in building heat loss calculations. However, it implies uncertainties due to the physical properties of the soil as well as the building structure. In this paper, new methods are introduced for calculating the heat loss at ground contact structures. Firstly, it examines the pres...
The heat loss at ground contact structures is taken into consideration in building heat loss calculations. However, the heat loss through the ground depends not only the soil and the building structure, but the environment as well. New calculation methods based on parametrized transient finite element thermal modelling are introduced in the precedi...
In this paper, the most common approximate thermal conductivity calculation methods were compared through Hungarian soil samples with laboratory measurement results and the representative values of EN ISO 13370:2007. Based on the results, the soil’s thermal conductivity can be estimated using the modified Johansen method for higher sand containing...
Heat loss of ground contact structures involves one of the most uncertainties in building physics simulations, because of the ground layers can have high thermal capacity and variable thermal conductivity depending on temperature and moisture content changing over time. Therefore multi-dimensional transient thermal analysis are necessary to obtain...
The aim of the Green Community Centre program is to establish a place for environmentally sustainable community development initiatives in Rîbnița, Transnistria.
After an on-site visit and survey - in the framework of the "Promoting Moldova's EU Aspirations" project - of a currently operating youth centre, which is documented with photos in the s...
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Dear Researchgate Forum users!
I am delighted to invite you to participate in the 6th Central European Symposium on Building Physics (CESBP 2025), scheduled for 11th – 13th September 2025, at the Budapest University of Technology and Economics in Budapest, Hungary. The call for papers just started! Also, we organize an IABP summer school connected to the conference! Please check the attached flyer and cesbp2025.bme.hu, if you are interested. Feel free to ask here, too, if you have questions about the conference!
