Temat: heat profiles - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A new method for calculation of high-temperature capacitors thermal resistance
Autorzy:: Hapka, A.
Powiązania:: https://bibliotekanauki.pl/articles/118564.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: high-temperature capacitors
heat profiles
thermal resistance
kondensatory wysokotemperaturowe
profile cieplne
rezystancja termiczna
Opis:: In this paper, issues related to the self-heating phenomenon in high-temperature capacitors are described. Measurements of capacitance and parasitic resistance, as a function of frequency and ambient temperature of considered capacitors are presented. Novel procedures for calculation of internal temperature changes are proposed and a novel method for acquiring thermal resistance values is developed and its numerical error is estimated.
W niniejszej pracy, opisano zagadnienia związane ze zjawiskiem samonagrzewania w kondensatorach wysokotemperaturowych. Przedstawiono wyniki pomiarów pojemności i oporności pasożytniczej wybranych kondensatorów w funkcji częstotliwości i temperatury otoczenia. Zaproponowano nową metodę obliczania zmian temperatury wewnątrz elementu oraz wyznaczania jego rezystancji termicznej. Oszacowano błędy numeryczne proponowanej metody.
Źródło:: Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej; 2016, 9; 99-106
1897-7421
Pojawia się w:: Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Impact of build-up areas and housing estate vegetation on diversity of the local climate in Warsaw
Autorzy:: Stopa-Boryczka, Maria
Boryczka, Jerzy
Wawer, Jolanta
Miłaszewska, Małgorzata
Powiązania:: https://bibliotekanauki.pl/articles/2034158.pdf
Data publikacji:: 2010-06-01
Wydawca:: Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:: Intensity of heat island
diurnal changes
annual changes
air temperature
latitudinal profiles
town
Opis:: The more important research results on the impact of building development and vegetation on the local climate, conducted in Warsaw in the years 1959-2009 by the Department of Climatology, are presented. Majority of the issues associated with determining the deformation of air temperature limits (urban heat islands), humidity and wind vector areas, because of buildings in housing estates, located in various parts of the city, were resolved in master's thesis. Areas with high building density are characterized by slow cooling and warming pace, especially during the summer months. Spatial changes in the urban heat islands in the east-west direction well describe the latitudinal profiles (W-E) of air temperature differences (∆T ≥ 0) between the city and its urban fringe. The urban heat island ∆T does not appears till 5PM, initially in the Central City District. Spatial diversity of effective temperature and catathermal cooling allowed to mark off in housing estates ( „Stawki”, „Służew nad Dolinką”, „Sady Żoliborskie”) places with perceptible conditions, e.g. heat, warmth, comfort, cold.
Źródło:: Miscellanea Geographica. Regional Studies on Development; 2010, 14; 121-134
0867-6046
2084-6118
Pojawia się w:: Miscellanea Geographica. Regional Studies on Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical analysis of the heating of a die for the extrusion of aluminium alloy profiles in terms of thermochemical treatment
Autorzy:: Joachimiak, Damian
Judt, Wojciech
Joachimiak, Magda
Powiązania:: https://bibliotekanauki.pl/articles/27312236.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: temperature distribution
solid component
extrusion
aluminium profiles
gas nitriding
direct
inverse
problem
heat conduction equation
Opis:: Thermochemical treatment processes are used to produce a surface layer of the workpiece with improved mechanical properties. One of the important parameters during the gas nitriding processes is the temperature of the surface. In thermochemical treatment processes, there is a problem in precisely determining the surface temperature of heat-treated massive components with complex geometries. This paper presents a simulation of the heating process of a die used to extrude aluminium profiles. The maximum temperature differences calculated in the die volume, on the surface and at the most mechanically stressed edge during the extrusion of the aluminum profiles were analysed. The heating of the die was simulated using commercial transient thermal analysis software. The numerical calculations of the die assumed a boundary condition in the form of the heat transfer coefficient obtained from experimental studies in a thermochemical treatment furnace and the solution of the nonstationary and non-linear inverse problem for the heat conduction equation in the cylinder. The die heating analysis was performed for various heating rates and fan settings. Major differences in the surface temperature and in the volume of the heated die were obtained. Possible ways to improve the productivity and control of thermochemical treatment processes were identified. The paper investigates the heating of a die, which is a massive component with complex geometry. This paper indicates a new way to develop methods for the control of thermochemical processing of massive components with complex geometries.
Źródło:: Archives of Thermodynamics; 2023, 44, 2; 159--175
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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