Thermodynamics as a wide branch of physics had a long historical development from the ancient tim... more Thermodynamics as a wide branch of physics had a long historical development from the ancient times to the 20 th century. The invention of the thermometer was the first important step that made possible to formulate the first precise speculations on heat.
Thermodynamics as a wide branch of physics had a long historical development from the ancient tim... more Thermodynamics as a wide branch of physics had a long historical development from the ancient times to the 20 th century. The invention of the thermometer was the first important step that made possible to formulate the first precise speculations on heat.
Thermodynamics as a wide branch of physics had a long historical development from the ancient tim... more Thermodynamics as a wide branch of physics had a long historical development from the ancient times to the 20 century. The invention of the thermometer was the first important step that made possible to formulate the first precise speculations on heat. There were no exact theories about the nature of heat for a long time and even the majority of the scientific world in the 18 and the early 19 century viewed heat as a substance and the representatives of the Kinetic Theory were rejected and stayed in the background. The Caloric Theory successfully explained plenty of natural phenomena like gas laws and heat transfer and it was impossible to refute it until the 1850s when the Principle of Conservation of Energy was introduced (Mayer, Joule, Helmholtz). The Second Law of Thermodynamics was discovered soon after that explanation of the tendency of thermodynamic processes and the heat loss of useful heat. The Kinetic Theory of Gases motivated the scientists to introduce the concept of en...
Earth houses have been traditional residential buildings for a long time and their three differen... more Earth houses have been traditional residential buildings for a long time and their three different types (in-hill house, cave dwelling and atrium house) were separated during the early history. Modern earth houses appeared in the 1960s in the USA but spread only after the first oil crisis. Earthsheltered houses became popular nowadays because of their several benefits (environmentally friendly, economical, energy savings, landscape protection). Unfortunately they have some disadvantages (negative prejudices, high building costs, special building constructions, complicated design and construction). Several design aspects (orientation, ventilation) are extremely important for in-earth embedded houses. Because of the nonconventional loads and landscape situations they have special building and supporting structures. They had also extraordinary damp-proofing and thermal insulation problems, this is why special solutions are needed to have pleasant and comfortable indoor atmosphere.
If all concrete is to be recycled in a future scenario, recycled concrete will be needed. Usually... more If all concrete is to be recycled in a future scenario, recycled concrete will be needed. Usually concrete recycling causes loss of properties, but this does not have to be truth for all the mixtures. This paper shows a comprehensive knowledge about the improving methods used to keep the properties of the recycled aggregate concrete (RAC). In the reviewed literature several kinds of RAC were tested with various replacement ratios. The effect of adding steel fibres, silica fume or fly ash to the mixture were also examined both separately and together. Most of the experiments demonstrated excellent mechanical properties of the RAC compared with ordinary concretes. Based on these results the ideal RAC composition can be deduced and a future can be imagined when concrete can be recycled multiple times (MRAC).
Among nanotechnology-based thermal insulation materials thermodynamic performance of nano-ceramic... more Among nanotechnology-based thermal insulation materials thermodynamic performance of nano-ceramic coatings generates intensive discussions. Complete agreement has not been found yet about the mechanism of their insulating effect. In the Laboratory of Building Materials and Building Physics at Széchenyi István University (Győr, Hungary) heat transfer resistance experiments have been performed in order to describe thermodynamic processes inside nano-ceramic coatings. Previous studies finding after new measurements conducted in 2016-2017 also supported the former assumption that in case of nano-ceramic coatings convective heat transfer coefficient might be taken into account in a different way. Results also showed that thermal insulating effect of nano-ceramic coatings could be caused by a relatively high surface heat transfer resistance.
From nanotechnology-based thermal insulation materials nano-ceramic thermal insulation coatings a... more From nanotechnology-based thermal insulation materials nano-ceramic thermal insulation coatings are generally considered to be the most critical because of contradictory technical data that could be founded in special literature. Complete agreement had not been already found about the mechanism how does their insulating effect take. In the Laboratory of Building Materials and Building Physics at Széchenyi István University (GyĘr, Hungary) several thermodynamic tests were made in order to find out thermodynamic process inside this material. Several building structures with different order of layers were tested with heat flow meter. Results showed that convective heat transfer coefficient cannot be taken account in usual way using this material as thermal insulation.
Because of the rigorous regulations in the 21st century it has become a serious task for designer... more Because of the rigorous regulations in the 21st century it has become a serious task for designers to find more effective ways for thermal insulation. One of these options is the application of nanotechnologybased materials. Among nano-scale structured materials the most uncertainties are found about the thermal insulating quality of thermal insulation coatings consisted of vacuum-hollow nano-ceramic microspheres. Complete agreement had not been already found about the mechanism of their insulating effect. In order to explore and describe the thermodynamic process inside nano-ceramic coatings (NCC) 6 series of heat transfer resistance experiments were performed in 2014-2017. Several building structure configurations with 12 different orders of layers were tested with a standard heat flow meter. On basis of these results it could be concluded that in case of nanostructured materials convective heat transfer coefficient might be taken account in different way than in case of traditional macro-structured thermal insulation materials.
Nanotechnology-based materials have previously been used by space research, pharmaceuticals and e... more Nanotechnology-based materials have previously been used by space research, pharmaceuticals and electronics, but in the last decade several nanotechnology-based thermal insulation materials have appeared in the building industry. Nowadays they only feature in a narrow range of practice, but they offer many potential applications. These options are unknown for the most architects, who may simply be afraid of these materials owing to the incomplete and often contradictory special literature. Therefore, they are distrustful and prefer to apply the usual and conventional technologies. This article is intended to provide basic information about nanotechnology-based thermal insulation materials for designers. It describes their most important material properties, functional principles, applications and potential usage options in building construction.
Nowadays, there is an increasing demand on environmentally friendly materials, so the environment... more Nowadays, there is an increasing demand on environmentally friendly materials, so the environmentally conscious architecture and the use of environmentally friendly materials have also become preferred. It is becoming increasingly important to turn from artificial materials to products made from renewable raw materials. The straw quilt, which is considered to be a new, innovative product on the Hungarian construction market, can provide an alternative for this need. The aim of this research was to investigate the material properties and possible uses of straw quilt thermal insulation. Laboratory tests were performed before the product was placed on the market. The results have shown that it has several advantageous properties that can make it competitive in the market of thermal insulation materials.
Because of the rigorous regulations in the 21st century it has become a serious task for designer... more Because of the rigorous regulations in the 21st century it has become a serious task for designers to find more effective ways for thermal insulation. One of these options is the application of nanotechnology-based materials. Among nano-scale structured materials the most uncertainties are found about the thermal insulating quality of thermal insulation coatings consisted of vacuum-hollow nano-ceramic microspheres. Complete agreement had not been already found about the mechanism of their insulating effect. In order to explore and describe the thermodynamic process inside nano-ceramic coatings (NCC) 6 series of heat transfer resistance experiments were performed in 2014-2017. Several building structure configurations with 12 different orders of layers were tested with a standard heat flow meter. On basis of these results it could be concluded that in case of nano-structured materials convective heat transfer coefficient might be taken account in different way than in case of traditi...
Among nanotechnology-based thermal insulation materials thermodynamic performance of nano-ceramic... more Among nanotechnology-based thermal insulation materials thermodynamic performance of nano-ceramic coatings generates intensive discussions. Complete agreement has not been found yet about the mechanism of their insulating effect. In the Laboratory of Building Materials and Building Physics at Széchenyi István University (Győr, Hungary) heat transfer resistance experiments have been performed in order to describe thermodynamic processes inside nano-ceramic coatings. Previous studies finding after new measurements conducted in 2016-2017 also supported the former assumption that in case of nano-ceramic coatings convective heat transfer coefficient might be taken into account in a different way. Results also showed that thermal insulating effect of nano-ceramic coatings could be caused by a relatively high surface heat transfer resistance.
From nanotechnology-based thermal insulation materials nano-ceramic thermal insulation coatings a... more From nanotechnology-based thermal insulation materials nano-ceramic thermal insulation coatings are generally considered to be the most critical because of contradictory technical data that could be founded in special literature. Complete agreement had not been already found about the mechanism how does their insulating effect take. In the Laboratory of Building Materials and Building Physics at Széchenyi István University (Győr, Hungary) several thermodynamic tests were made in order to find out thermodynamic process inside this material. Several building structures with different order of layers were tested with heat flow meter. Results showed that convective heat transfer coefficient cannot be taken account in usual way using this material as thermal insulation.
Nanotechnology-based materials have previously been used by space research, pharmaceuticals and e... more Nanotechnology-based materials have previously been used by space research, pharmaceuticals and electronics, but in the last decade several nanotechnology-based thermal insulation materials have appeared in the building industry. Nowadays they only feature in a narrow range of practice, but they offer many potential applications. These options are unknown for the most architects, who may simply be afraid of these materials owing to the incomplete and often contradictory special literature. Therefore, they are distrustful and prefer to apply the usual and conventional technologies. This article is intended to provide basic information about nanotechnology-based thermal insulation materials for designers. It describes their most important material properties, functional principles, applications and potential usage options in building construction.
Liquid nano-ceramic thermal insulation coatings appeared in the last decades on the market of the... more Liquid nano-ceramic thermal insulation coatings appeared in the last decades on the market of thermal insulation materials. This paint-on insulation contains microscopic cellular ceramic microspheres. These vacuum-hollow balls were made of on high temperature melted ceramic. Its binding material is a mixture of synthetic rubber and other polymers. After mixing with water, using brush or vacuum vaporizer can be taken on the surface to be insulated. The special literature of liquid nano-ceramic thermal insulation coatings gives different and contradictory thermodynamic details about this material. According to some sources its thermal conductivity is around 0,001-0,003 W/mK, but other papers publish much higher thermal conductivity values (from 0,01 W/mK to 0,14 W/mK). In the Laboratory of Building Materials and Building Physics at Széchenyi István University (Győr, Hungary) several thermodynamic test were made with liquid nano-ceramic thermal insulation coatings. On basis of European Standards (EN) the thermal conductivity and water absorption of this material was determined. The relationship between thermal conductivity and water content was analyzed. Experiments were performed with conventional thermal insulation materials with additional ceramic coating on one side, two sides and beside two plates. Results were analyzed in order to prove the low thermal conductivity and heat mirror effect of this material.
Thermodynamics as a wide branch of physics had a long historical development from the ancient tim... more Thermodynamics as a wide branch of physics had a long historical development from the ancient times to the 20 th century. The invention of the thermometer was the first important step that made possible to formulate the first precise speculations on heat.
Thermodynamics as a wide branch of physics had a long historical development from the ancient tim... more Thermodynamics as a wide branch of physics had a long historical development from the ancient times to the 20 th century. The invention of the thermometer was the first important step that made possible to formulate the first precise speculations on heat.
Thermodynamics as a wide branch of physics had a long historical development from the ancient tim... more Thermodynamics as a wide branch of physics had a long historical development from the ancient times to the 20 century. The invention of the thermometer was the first important step that made possible to formulate the first precise speculations on heat. There were no exact theories about the nature of heat for a long time and even the majority of the scientific world in the 18 and the early 19 century viewed heat as a substance and the representatives of the Kinetic Theory were rejected and stayed in the background. The Caloric Theory successfully explained plenty of natural phenomena like gas laws and heat transfer and it was impossible to refute it until the 1850s when the Principle of Conservation of Energy was introduced (Mayer, Joule, Helmholtz). The Second Law of Thermodynamics was discovered soon after that explanation of the tendency of thermodynamic processes and the heat loss of useful heat. The Kinetic Theory of Gases motivated the scientists to introduce the concept of en...
Earth houses have been traditional residential buildings for a long time and their three differen... more Earth houses have been traditional residential buildings for a long time and their three different types (in-hill house, cave dwelling and atrium house) were separated during the early history. Modern earth houses appeared in the 1960s in the USA but spread only after the first oil crisis. Earthsheltered houses became popular nowadays because of their several benefits (environmentally friendly, economical, energy savings, landscape protection). Unfortunately they have some disadvantages (negative prejudices, high building costs, special building constructions, complicated design and construction). Several design aspects (orientation, ventilation) are extremely important for in-earth embedded houses. Because of the nonconventional loads and landscape situations they have special building and supporting structures. They had also extraordinary damp-proofing and thermal insulation problems, this is why special solutions are needed to have pleasant and comfortable indoor atmosphere.
If all concrete is to be recycled in a future scenario, recycled concrete will be needed. Usually... more If all concrete is to be recycled in a future scenario, recycled concrete will be needed. Usually concrete recycling causes loss of properties, but this does not have to be truth for all the mixtures. This paper shows a comprehensive knowledge about the improving methods used to keep the properties of the recycled aggregate concrete (RAC). In the reviewed literature several kinds of RAC were tested with various replacement ratios. The effect of adding steel fibres, silica fume or fly ash to the mixture were also examined both separately and together. Most of the experiments demonstrated excellent mechanical properties of the RAC compared with ordinary concretes. Based on these results the ideal RAC composition can be deduced and a future can be imagined when concrete can be recycled multiple times (MRAC).
Among nanotechnology-based thermal insulation materials thermodynamic performance of nano-ceramic... more Among nanotechnology-based thermal insulation materials thermodynamic performance of nano-ceramic coatings generates intensive discussions. Complete agreement has not been found yet about the mechanism of their insulating effect. In the Laboratory of Building Materials and Building Physics at Széchenyi István University (Győr, Hungary) heat transfer resistance experiments have been performed in order to describe thermodynamic processes inside nano-ceramic coatings. Previous studies finding after new measurements conducted in 2016-2017 also supported the former assumption that in case of nano-ceramic coatings convective heat transfer coefficient might be taken into account in a different way. Results also showed that thermal insulating effect of nano-ceramic coatings could be caused by a relatively high surface heat transfer resistance.
From nanotechnology-based thermal insulation materials nano-ceramic thermal insulation coatings a... more From nanotechnology-based thermal insulation materials nano-ceramic thermal insulation coatings are generally considered to be the most critical because of contradictory technical data that could be founded in special literature. Complete agreement had not been already found about the mechanism how does their insulating effect take. In the Laboratory of Building Materials and Building Physics at Széchenyi István University (GyĘr, Hungary) several thermodynamic tests were made in order to find out thermodynamic process inside this material. Several building structures with different order of layers were tested with heat flow meter. Results showed that convective heat transfer coefficient cannot be taken account in usual way using this material as thermal insulation.
Because of the rigorous regulations in the 21st century it has become a serious task for designer... more Because of the rigorous regulations in the 21st century it has become a serious task for designers to find more effective ways for thermal insulation. One of these options is the application of nanotechnologybased materials. Among nano-scale structured materials the most uncertainties are found about the thermal insulating quality of thermal insulation coatings consisted of vacuum-hollow nano-ceramic microspheres. Complete agreement had not been already found about the mechanism of their insulating effect. In order to explore and describe the thermodynamic process inside nano-ceramic coatings (NCC) 6 series of heat transfer resistance experiments were performed in 2014-2017. Several building structure configurations with 12 different orders of layers were tested with a standard heat flow meter. On basis of these results it could be concluded that in case of nanostructured materials convective heat transfer coefficient might be taken account in different way than in case of traditional macro-structured thermal insulation materials.
Nanotechnology-based materials have previously been used by space research, pharmaceuticals and e... more Nanotechnology-based materials have previously been used by space research, pharmaceuticals and electronics, but in the last decade several nanotechnology-based thermal insulation materials have appeared in the building industry. Nowadays they only feature in a narrow range of practice, but they offer many potential applications. These options are unknown for the most architects, who may simply be afraid of these materials owing to the incomplete and often contradictory special literature. Therefore, they are distrustful and prefer to apply the usual and conventional technologies. This article is intended to provide basic information about nanotechnology-based thermal insulation materials for designers. It describes their most important material properties, functional principles, applications and potential usage options in building construction.
Nowadays, there is an increasing demand on environmentally friendly materials, so the environment... more Nowadays, there is an increasing demand on environmentally friendly materials, so the environmentally conscious architecture and the use of environmentally friendly materials have also become preferred. It is becoming increasingly important to turn from artificial materials to products made from renewable raw materials. The straw quilt, which is considered to be a new, innovative product on the Hungarian construction market, can provide an alternative for this need. The aim of this research was to investigate the material properties and possible uses of straw quilt thermal insulation. Laboratory tests were performed before the product was placed on the market. The results have shown that it has several advantageous properties that can make it competitive in the market of thermal insulation materials.
Because of the rigorous regulations in the 21st century it has become a serious task for designer... more Because of the rigorous regulations in the 21st century it has become a serious task for designers to find more effective ways for thermal insulation. One of these options is the application of nanotechnology-based materials. Among nano-scale structured materials the most uncertainties are found about the thermal insulating quality of thermal insulation coatings consisted of vacuum-hollow nano-ceramic microspheres. Complete agreement had not been already found about the mechanism of their insulating effect. In order to explore and describe the thermodynamic process inside nano-ceramic coatings (NCC) 6 series of heat transfer resistance experiments were performed in 2014-2017. Several building structure configurations with 12 different orders of layers were tested with a standard heat flow meter. On basis of these results it could be concluded that in case of nano-structured materials convective heat transfer coefficient might be taken account in different way than in case of traditi...
Among nanotechnology-based thermal insulation materials thermodynamic performance of nano-ceramic... more Among nanotechnology-based thermal insulation materials thermodynamic performance of nano-ceramic coatings generates intensive discussions. Complete agreement has not been found yet about the mechanism of their insulating effect. In the Laboratory of Building Materials and Building Physics at Széchenyi István University (Győr, Hungary) heat transfer resistance experiments have been performed in order to describe thermodynamic processes inside nano-ceramic coatings. Previous studies finding after new measurements conducted in 2016-2017 also supported the former assumption that in case of nano-ceramic coatings convective heat transfer coefficient might be taken into account in a different way. Results also showed that thermal insulating effect of nano-ceramic coatings could be caused by a relatively high surface heat transfer resistance.
From nanotechnology-based thermal insulation materials nano-ceramic thermal insulation coatings a... more From nanotechnology-based thermal insulation materials nano-ceramic thermal insulation coatings are generally considered to be the most critical because of contradictory technical data that could be founded in special literature. Complete agreement had not been already found about the mechanism how does their insulating effect take. In the Laboratory of Building Materials and Building Physics at Széchenyi István University (Győr, Hungary) several thermodynamic tests were made in order to find out thermodynamic process inside this material. Several building structures with different order of layers were tested with heat flow meter. Results showed that convective heat transfer coefficient cannot be taken account in usual way using this material as thermal insulation.
Nanotechnology-based materials have previously been used by space research, pharmaceuticals and e... more Nanotechnology-based materials have previously been used by space research, pharmaceuticals and electronics, but in the last decade several nanotechnology-based thermal insulation materials have appeared in the building industry. Nowadays they only feature in a narrow range of practice, but they offer many potential applications. These options are unknown for the most architects, who may simply be afraid of these materials owing to the incomplete and often contradictory special literature. Therefore, they are distrustful and prefer to apply the usual and conventional technologies. This article is intended to provide basic information about nanotechnology-based thermal insulation materials for designers. It describes their most important material properties, functional principles, applications and potential usage options in building construction.
Liquid nano-ceramic thermal insulation coatings appeared in the last decades on the market of the... more Liquid nano-ceramic thermal insulation coatings appeared in the last decades on the market of thermal insulation materials. This paint-on insulation contains microscopic cellular ceramic microspheres. These vacuum-hollow balls were made of on high temperature melted ceramic. Its binding material is a mixture of synthetic rubber and other polymers. After mixing with water, using brush or vacuum vaporizer can be taken on the surface to be insulated. The special literature of liquid nano-ceramic thermal insulation coatings gives different and contradictory thermodynamic details about this material. According to some sources its thermal conductivity is around 0,001-0,003 W/mK, but other papers publish much higher thermal conductivity values (from 0,01 W/mK to 0,14 W/mK). In the Laboratory of Building Materials and Building Physics at Széchenyi István University (Győr, Hungary) several thermodynamic test were made with liquid nano-ceramic thermal insulation coatings. On basis of European Standards (EN) the thermal conductivity and water absorption of this material was determined. The relationship between thermal conductivity and water content was analyzed. Experiments were performed with conventional thermal insulation materials with additional ceramic coating on one side, two sides and beside two plates. Results were analyzed in order to prove the low thermal conductivity and heat mirror effect of this material.
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Papers by Dávid Bozsaky