CCL

Összesen 4 találat.
#/oldal:
Részletezés:
Rendezés:

1.

001-es BibID:BIBFORM094624
035-os BibID:(cikkazonosító)4943 (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
Borító:

2.

001-es BibID:BIBFORM089143
035-os BibID:(cikkazonosító)7824 (WoS)000588986300001 (Scopus)85095707299
Első szerző:Lakatos Ákos (fizikus, környezetmérnök, létesítménymérnök)
Cím:Exceeding the Applicability Limit of Aerogel Super Insulation Materials in Different Environmental Conditions / Ákos Lakatos
Dátum:2020
ISSN:2076-3417
Tárgyszavak:Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Applied Sciences-Basel. - 10 (2020), p. 1-14. -
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
Borító:

3.

001-es BibID:BIBFORM102336
035-os BibID:(Scopus)85131873193 (cikkazonosító)5688 (WOS)000809964500001
Első szerző:Szodrai Ferenc (létesítménymérnök)
Cím:Numerical Assessment of Side-Wind Effects on a Bus in Urban Conditions / Ferenc Szodrai
Dátum:2022
ISSN:2076-3417
Megjegyzések:The drag coefficient is usually considered to be a constant value, which allows us to calculate the aerodynamic losses. However, at lower speeds and wind, this value could be distorted. This also applies to buses in urban environments where due to traffic, the speed is relatively low. Since the schedule of the buses is fixed, based on the driving cycle, they travel at a nominal cruising speed. This makes it possible to examine the drag losses in a quasi-steady condition. To find the magnitude of this distortion in losses, a large-eddy simulation method was used with the help of commercially available software. Symmetrical and asymmetrical flows were induced into the digital wind tunnel to assess the distribution of the forces in the cruising direction and examine the flow patterns. It was discovered that the drag forces behave differently due to the low speeds, and calculations should be performed differently compared to high-speed drag evaluations.
Tárgyszavak:Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
drag loss
side wind
large-eddy simulation
bus
Megjelenés:Applied Sciences-Basel. - 12 : 11 (2022), p. 1-14. -
Pályázati támogatás:ED_18-1-2019-0028
Egyéb
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

4.

001-es BibID:BIBFORM086656
035-os BibID:(Scopus)85087316135 (WOS)000554727500001 (cikkazonosító)4313
Első szerző:Szodrai Ferenc (létesítménymérnök)
Cím:Quantitative Analysis of Drag Reduction Methods for Blunt Shaped Automobiles / Ferenc Szodrai
Dátum:2020
ISSN:2076-3417
Megjegyzések:In fluid mechanics, drag related problems aim to reduce fuel consumption. This paper is intended to provide guidance for drag reduction applications on cars. The review covers papers from the beginning of 2000 to April 2020 related to drag reduction research for ground vehicles. Research papers were collected from the library of Science Direct, Web of Science, and Multidisciplinary Digital Publishing Institute (MDPI). Achieved drag reductions of each research paper was collected and evaluated. The assessed research papers attained their results by wind tunnel measurements or calculating validated numerical models. The study mainly focuses on hatchback and notchback shaped ground vehicle drag reduction methods, such as active and passive systems. Quantitative analysis was made for the drag reduction methods where relative and absolute drag changes were used for evaluations.
Tárgyszavak:Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
active flow control
passive flow control
coefficient of drag
ground vehicle
car
Megjelenés:Applied Sciences-Basel. - 10 : 12 (2020), p. 1-19. -
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Rekordok letöltése1