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001-es BibID:	BIBFORM127911
035-os BibID:	(Scopus)85218349296
Első szerző:	Lakatos Ákos (fizikus, környezetmérnök, létesítménymérnök)
Cím:	Identifying the alteration in the thermal properties of aerogel thermal insulation after heat treatment with different methods / Ákos Lakatos, Attila Csík, Petra Herman, István Csarnovics
Dátum:	2025
ISSN:	2352-7102
Megjegyzések:	Regulations aimed at limiting and eliminating unnecessary energy usage and the associated emissions of hazardous materials are becoming more and more stringent when it comes to newly planned and built buildings. The need for these initiatives is also growing among consumers due to the rise of an increasingly environmentally and energy-conscious mindset. Moreover, vehicles, industrial applications, or pipes transporting hot water can also use thin layered insulation. Aerogel materials fit these cases, too. Technological advances have also led to an expansion in the production of thermal insulation materials. New materials like aerogels, vacuum thermal insulation panels, and graphite-infused polystyrene foam have joined the market. It is essential to understand their properties after aging them through heat treatments. This study presents the change in the thermal properties of a Pyrogel-type aerogel material after thermal treatment at 150 and 250 oC for 1 day. The reason for this was to understand the thermal stability of the samples for their possible use at a temperature range of up to 250 oC. Because, in some cases, these materials can meet higher temperatures, such as in industrial cases. Due to the thermal annealing, the thermal conductivity, diffusivity, and volumetric heat capacity change will be discussed. We deduced a 5% increase in thermal conductivity and a 6% increase in the specific heat capacity after thermal annealing at 250 oC. These characteristics resulted in changes in thermal diffusivity and the volumetric heat capacity. The thermal diffusivity changed only after annealing at 250 oC, while the volumetric heat capacity continuously increased. Micro and macrostructural characterization tests were executed on the samples to understand this. Moreover, the microscopic background of these changes is also revealed. Several complementary measurements were used to explain the changes, such as X-ray diffraction, differential scanning calorimetry, infrared spectroscopy (IR), and Raman spectroscopy. The test methods have demonstrated that the observed increases in thermal conductivity, specific heat, and volumetric heat capacity are primarily due to significant crystallization and recrystallization processes occurring within the aerogel material. Additionally, the slight alteration in thermal diffusion is linked to amorphization, indicating a complex interplay between structural changes and thermal properties. This nuanced understanding highlights the importance of thorough characterization in evaluating the behaviour of materials under varying thermal treatments. These measurements also gave results on crystallization and amorphous changes as an explanation of the thermal changes. The interdisciplinarity of our paper proves its innovation. We briefly presented the environmental impact of aerogels.
Tárgyszavak:	Műszaki tudományok Anyagtudományok és technológiák idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk aerogel heat stability spectroscopy thermal properties
Megjelenés:	Journal of Building Engineering. - 103 (2025), p. 1-16. -
További szerzők:	Csík Attila Herman Petra (1994-) (környezetkutató) Csarnovics István (1986-) (fizikus)
Pályázati támogatás:	TKP2021-NKTA-34 Egyéb
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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001-es BibID:	BIBFORM094624
035-os BibID:	(WOS)000659635900001 (Scopus)85107914481
Első szerző:	Lakatos Ákos (fizikus, környezetmérnök, létesítménymérnök)
Cím:	Systematic analysis of micro-fiber thermal insulations from thermal properties point of view / Ákos Lakatos, István Csarnovics, Attila Csík
Dátum:	2021
ISSN:	2076-3417
Megjegyzések:	This paper contains laboratory measurements of four different micro-fiber thermal insulation materials to reveal their applicability limits under various environmental conditions. On the samples, scanning electron microscope investigations were executed to disclose the structure of the fibers. The study also investigated the most important thermal parameters of the samples, namely, the thermal conductivity and the calorific value with the specific heat capacity. Humidity measurements and hydrophobic tests were also conducted and the sorption isotherm of the samples was registered. To reveal the thermal stability as well as the applicability limits, differential scanning calorimetry and Raman spectroscopy measurements have also been performed. As a result of these comprehensive measurements, one can predict the behavior of the samples in various external circumstances. The results can generate further studies and are very useful for both designers, planners, and researchers. In the European Union, almost 40% of all energy consumption comes from buildings, while another 20-25% comes from transport. In the European Union, including Hungary, only buildings with almost-zero energy demand could be built after 2020, and the use of renewable energies must be strengthened. The Renewable Directive stipulated that by 2020, the share of renewable energy in buildings must be 25%, and in transport it must be 10%; the use of electric vehicles is vital. There are about four million dwellings in Hungary, of which approximately three million need to be renovated, and only some of these (a few hundred) meet the cost-optimized level of the 2020 directive. The use of insulation materials is very important in the transport sector, too. Insulation materials are also used by aircraft and electric vehicles. To reduce the energy loss from buildings, different insulation materials can be used; investigations of insulation materials are very important. This paper presents a comprehensive research report on insulation materials which could be used for building elements, HVAC (heating, ventilation, and air conditioning appliances) equipment, and vehicles. In this paper, laboratory investigations will be presented along with calculations to better understand the properties and behavior of these materials. For this, firstly structural analysis with scanning electron microscope will be presented. Moreover, the paper will present thermal conductivity and combustion heat measurement results. The sorption and hydrophobic behavior of the materials will be also revealed. Finally, the article will also display differential scanning calorimetry measurements and Raman spectroscopy results of the samples. The research was conducted on four different types of colorized microfiber lightweight wool insulation.
Tárgyszavak:	Műszaki tudományok Anyagtudományok és technológiák idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk thermal properties fibrous insulation sthermal insulation
Megjelenés:	Applied Sciences-Basel. - 11 : 11 (2021), p. 1-18. -
További szerzők:	Csarnovics István (1986-) (fizikus) Csik Attila (1975-) (fizikus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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001-es BibID:	BIBFORM092654
035-os BibID:	(WoS)000647801400006 (Scopus)85104028833
Első szerző:	Lakatos Ákos (fizikus, környezetmérnök, létesítménymérnök)
Cím:	Experimental verification of thermal properties of the aerogel blanket / Ákos Lakatos, Attila Csík, István Csarnovics
Dátum:	2021
ISSN:	2214-157X
Tárgyszavak:	Műszaki tudományok Anyagtudományok és technológiák idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Case Studies in Thermal Engineering. - 25 (2021), p. 1-17. -
További szerzők:	Csik Attila (1975-) (fizikus) Csarnovics István (1986-) (fizikus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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001-es BibID:	BIBFORM081894
Első szerző:	Lakatos Ákos (fizikus, környezetmérnök, létesítménymérnök)
Cím:	Influence of thermal annealing on structural properties of silica aerogel super insulation material / Ákos Lakatos, István Csarnovics
Dátum:	2020
ISSN:	1388-6150 1588-2926
Tárgyszavak:	Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Journal of Thermal Analysis and Calorimetry. - 142 (2020), p. 321-329. -
További szerzők:	Csarnovics István (1986-) (fizikus)
Pályázati támogatás:	NKFIH-1150-6/2019 Egyéb GINOP-2.3.2-15-2016-00041 GINOP
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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