Temat: emissivity coefficient - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The influence of a radiated heat exchanger surface on heat transfer
Autorzy:: Morel, S.
Powiązania:: https://bibliotekanauki.pl/articles/240062.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: heat exchanger
reciprocal emissivity coefficient
wymiennik ciepła
współczynnik emisyjności
Opis:: The experiment leads to establish the influence of radiated surface development heat exchangers on the values of heat flux transferred with water flowing through the exchangers and placed in electric furnace chamber. The values of emissivity coefficients are given for the investigated metal and ceramic coatings. Analytical calculations have been made for the effect of the heating medium (flame) – uncoated wall and then heating medium (flame) – coated wall reciprocal emissivity coefficients. Analysis of the values of exchanged heat flux were also realized. Based on the measurement results for the base coating properties, these most suitable for spraying the walls of furnaces and heat exchangers were selected, and determined by the intensification of heat exchange effect. These coatings were used to spray the walls of a laboratory waste-heat boiler, and then measurements of fluxes of heat absorbed by the cooling water flowing through the boiler tubes covered with different type coatings were made. Laboratory tests and calculations were also confirmed by the results of full-scale operation on the metallurgical equipment.
Źródło:: Archives of Thermodynamics; 2015, 36, 3; 161-174
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Determination of emissivity coefficient of heat-resistant super alloys and cemented carbide
Autorzy:: Kieruj, P.
Przestacki, D.
Chwalczuk, T.
Powiązania:: https://bibliotekanauki.pl/articles/94096.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: nickel alloys
emissivity coefficient
tungsten carbides
stopy niklu
współczynnik emisyjności
węgliki wolframu
Opis:: This paper presents the analysis of emissivity engineering materials according to temperature. Experiment is concerned on difficult to machine materials, which may be turned with laser assisting. Cylindrical samples made of nickel-based alloys Inconel 625, Inconel 718, Waspaloy and tungsten-carbides based on cobalt matrix were analyzed. The samples’ temperature in contact method was compared to the temperature measured by non-contact pyrometers. Based on this relative, the value of the emissivity coefficient was adjusted to the right indication on pyrometers.
Źródło:: Archives of Mechanical Technology and Materials; 2016, 36; 30-34
2450-9469
Pojawia się w:: Archives of Mechanical Technology and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Wybrane aspekty termowizyjnych pomiarów temperatury tarczy podczas eksperymentalnych badań hamulców tarczowych
Some aspects of IR temperature measurements of a disc during experimental investigations of disc brakes
Autorzy:: Kruczek, T.
Kowal, L.
Turewicz, K.
Ścieszka, S. F.
Żołnierz, M.
Powiązania:: https://bibliotekanauki.pl/articles/155564.pdf
Data publikacji:: 2013
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: hamulec tarczowy
temperatura tarczy
pomiary termowizyjne
emisyjność tarczy
disc brake
disc temperature
infrared camera measurements
disc emissivity coefficient
Opis:: Przedstawiono wybrane wyniki badań hamulca tarczowego na stanowisku laboratoryjnym. W trakcie doświadczeń mierzone były główne parametry procesu hamowania oraz rozkłady temperatury w klocku i na powierzchni tarczy hamulcowej za pomocą kamery termowizyjnej. Zebrane dane pomiarowe stanowią materiał do weryfikacji modeli matematycznych przy numerycznej symulacji działania tego typu hamulców. Głównym tematem tej pracy jest analiza zmian współczynnika emisyjności powierzchni tarczy w warunkach prowadzenia eksperymentów. Znajomość stwierdzonych prawidłowości jest przydatna przy planowaniu i prowadzeniu tego typu badań.
Selected results of testing a disc brake on the laboratory stand, Fig. 1, are presented. There were measured the parameters of braking mechanics as well as the temperature distribution in a brake block and on the disc surface. The temperature distribution was determined with use of an infrared camera. The obtained measurement data were used for verification of the mathematical models for numerical simulations of brakes operation. The problems in determination of the disc surface emissivity coefficient and the character of its changeability during experiments at different braking parameters, Figs. 58, were the objectives of the project. The measurements of the emissivity coefficient on the entire disc surface were taken repeatedly, Figs. 2, 3. A correlation between the disc emissivity coefficient and the mechanical parameters of braking was found. Despite the fact that these correlations are qualitative rather than quantitative, they are interesting from the point of view of identification of the braking process as well as of planning such experiments. During the measurements, some interesting practical experience in the field of infrared measurements of temperature of the surface of not high emissivity coefficient was gained. In the project an isothermal protective screen was applied to normalize the radiation impact of the environment on the measurements, Figs 1, 4.
Źródło:: Pomiary Automatyka Kontrola; 2013, R. 59, nr 9, 9; 969-972
0032-4140
Pojawia się w:: Pomiary Automatyka Kontrola
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical and Experimental Investigation of the Influence of External Wall Moisture on Building Temperature Distributions
Autorzy:: Urzędowski, Arkadiusz
Zaburko, Jacek
Gleń, Piotr
Łagód, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/2023298.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: CFD
CFX
heat transfer coefficient
wet building materials
thermal imaging
building structural
materials
surface emissivity
Opis:: In this paper, the authors made attempt to analyse the influence of moisture in the external wall of a building on the distribution of the temperature field, using numerical and experimental methods. Studies were carried out in the places of heat leakage occurring in structural joints of a single-family residential building, built in the traditional technology. In this study, the thermal bridge parameters were calculated by determining the values of thermal and moisture identifiers. For this purpose, two three-dimensional models of the building partition were designed based on an existing structure, and the boundary conditions for simulations were determined. The obtained heat flux values made it possible to perform quantitative calculations of heat flux distributions and temperatures of construction joints within the thermal bridge occurrence area. Moreover, the accuracy of the final temperatures obtained after combining the mathematical models with the values determined from thermograms was evaluated. In order to validate the results of numerical simulation, a test model was used taking into account the parameters specified in PL-EN 15026. The analysis aimed to present the handiness of using the simulation at the stage of planning the design and thermomodernisation of buildings in the places particularly exposed to adverse terrain and atmospheric conditions.
Źródło:: Advances in Science and Technology. Research Journal; 2021, 15, 3; 297-308
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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