Temat: thermal coupling - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Oddziaływanie termiczne pomiędzy źródłami hp LED zainstalowanymi na wspólnym radiatorze
Thermal interaction between the hp LED sources installed on a common radiator
Autorzy:: Różowicz, A.
Baran, K.
Powiązania:: https://bibliotekanauki.pl/articles/159319.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:: LED
źródło ciepła
sprzężenia termiczne
temperatura złącza
model matematyczny
heat source
thermal coupling
junction temperature
mathematical model
Opis:: W artykule zaprezentowano model matematyczny pozwalający wyznaczyć temperaturę radiatora, na którym może być zainstalowana dowolna ilość sprzężonych ze sobą termicznie źródeł ciepła. Na podstawie modelu symulacyjnie wyznaczono temperaturę płyty aluminiowej, na której zainstalowano źródła światła LED, będące źródłami ciepła. Symulację przeprowadzono dla kilku przypadków, w których zmieniana była ilość, moc oraz odległość pomiędzy źródłami LED. Oszacowany w ten sposób rozkład temperatury radiatora może być wykorzystany do obliczenia temperatury złącza, która wpływa na podstawowe parametry źródeł LED.
The article presents the mathematical model allowing to determine the temperature of the radiator, on which there can be installed any number of heat sources coupled with each other. Based on the model, the temperature of the aluminium plate with installed LED light sources (being the sources of heat) was determined by simulation. The simulation was performed for several cases, in which the amount, power and the distance between LED sources was different. Thus estimated distribution of the radiator can be used to calculate the temperature of the junction, chich influences the basic parameters of LED sources.
Źródło:: Prace Instytutu Elektrotechniki; 2014, 266; 87-97
0032-6216
Pojawia się w:: Prace Instytutu Elektrotechniki
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Investigation of the skull melting method for the generation of particulate material of inorganic compounds
Autorzy:: Riemer, B.
Lange, E.
Hameyer, K.
Powiązania:: https://bibliotekanauki.pl/articles/140920.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: tygiel
topienie
pole elektromagnetyczne
pole termiczne
sprzężenie
skull melting
cold crucible
electromagnetic thermal field coupling
Opis:: This paper describes the application of the skull melting method for an artificial generation of particulate material of inorganic compounds like CsOH, NaOH, SnO2 and UO2. The skull melting process is analyzed analytically. Thereby the electromagnetic field is calculated by a one dimensional time harmonic model. Thermal losses are estimated by simple analytical formulas. Finally an electromagnetic thermal field coupling is performed to calculate the temperature distribution inside the crucible, considering transient thermal effects. The skull melting process is simulated for the example of UO2. Under consideration of the given material properties it is shown that the skull melting method can be applied to fuse UO2.
Źródło:: Archives of Electrical Engineering; 2011, 60, 2; 197-209
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Reliability analysis of multi-site damage with failure dependency of the turbine based on flow-thermal-solid coupling analysis and the Monte Carlo validated simulations
Autorzy:: Qian, Wenxue
Zeng, Xianhai
Huang, Shuanghui
Yin, Xiaowei
Powiązania:: https://bibliotekanauki.pl/articles/27312780.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: flow-thermal-solid coupling analysis
Monte Carlo simulation
turbine disk
multiple loads
probabilistic modeling
system reliability with failure dependency
Opis:: The harsh environmental loads may lead to strength failure in the turbine in an aero-engine. To accurately assess the strength reliability of the turbine under multiple loads, the stress distributions of 41 danger sites of a turbine under thermal, centrifugal, and pneumatic loads were determined by the flow-thermal-solid coupling analysis using ANSYS. Second, based on the flow-thermal-solid coupling analysis and response surface method, the probabilistic analysis model of stress at the danger site was established. And the probabilistic distribution of stress was determined by sampling and hypothesis testing. Finally, the reliability model of the turbine with multi-site damage and failure dependency was established, by which a reliability of 0.99802 was calculated. And the actual reliability of the turbine was 0.99626 determined by the Monte Carlo simulations, which verified the model in precision. The results indicated that the reliability model has a high efficiency and higher precision than the traditional reliability model with failure independence.
Źródło:: Eksploatacja i Niezawodność; 2023, 25, 3; art. no. 168771
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Neutronic and thermal-hydraulic coupling for 3D reactor core modeling combining MCB and fluent
Autorzy:: Królikowski, I. P.
Cetnar, J.
Powiązania:: https://bibliotekanauki.pl/articles/147457.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: code coupling
modeling
Monte Carlo
neutronics
nuclear reactor
thermal hydraulics
Opis:: Three-dimensional simulations of neutronics and thermal hydraulics of nuclear reactors are a tool used to design nuclear reactors. The coupling of MCB and FLUENT is presented, MCB allows to simulate neutronics, whereas FLUENT is computational fluid dynamics (CFD) code. The main purpose of the coupling is to exchange data such as temperature and power profi le between both codes. Temperature required as an input parameter for neutronics is significant since cross sections of nuclear reactions depend on temperature. Temperature may be calculated in thermal hydraulics, but this analysis needs as an input the power profile, which is a result from neutronic simulations. Exchange of data between both analyses is required to solve this problem. The coupling is a better solution compared to the assumption of estimated values of the temperatures or the power profiles; therefore the coupled analysis was created. This analysis includes single transient neutronic simulation and several steady-state thermal simulations. The power profi le is generated in defined points in time during the neutronic simulation for the thermal analysis to calculate temperature. The coupled simulation gives information about thermal behavior of the reactor, nuclear reactions in the core, and the fuel evolution in time. Results show that there is strong influence of neutronics on thermal hydraulics. This impact is stronger than the impact of thermal hydraulics on neutronics. Influence of the coupling on temperature and neutron multiplication factor is presented. The analysis has been performed for the ELECTRA reactor, which is lead-cooled fast reactor concept, where the coolant flow is generated only by natural convection.
Źródło:: Nukleonika; 2015, 60, No. 3, part 2; 531-536
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Study of wind power utilization in district heating systemsin the Westfjords, Iceland
Autorzy:: Mathews, Kamil
Sowiżdżał, Anna
Powiązania:: https://bibliotekanauki.pl/articles/184426.pdf
Data publikacji:: 2019
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: Renewable Energy Sources
sector coupling
wind turbines
district heating
Thermal Energy Storage
Iceland
the Westfjords
Opis:: Some Renewable Energy Sources (RES), such as wind power, are often regarded as intermittent. That means they are not available on demand, but rather depend on external conditions e.g. such as the weather. In order to manage these resources, it is advised to combine them with energy storage or other energy sectors, what is known as “sector coupling”. This approach is set to mitigate the negative impact of unstable renewable energy sources and manage the generated surpluses. In this study, a system combining wind turbines, district heating network and short-term thermal energy storage was proposed and examined for the instance of the Westfjords, Iceland. Ísafjörður, Patreksfjörður, Bolungarvík and Flateyri are the exemplary communities with existing district heating networks, chosen to investigate the implementation of the system. A short review of the current state of the energy sector in Iceland was provided to present the local conditions. Wind potential in the described area was estimated as high in comparison with average wind turbine generation in the European Union and a few instances of wind turbines placement were analyzed in this study. For locations close to the district heating net-work, a long-term correlation between power generation and usage was proven. However, locating wind turbines in places with better wind conditions, provides stable output and a similar amount of energy produced by fewer generators.
Źródło:: Geology, Geophysics and Environment; 2019, 45, 2; 77-88
2299-8004
2353-0790
Pojawia się w:: Geology, Geophysics and Environment
Dostawca treści:: Biblioteka Nauki

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