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Wyszukujesz frazę "thermal network method" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Thermal - electrical analogy in dynamic simulations of buildings: comparison of four numerical solution methods
Autorzy:
Michalak, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1819185.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
thermal-electrical analogy
RC network
lumped capacitance
BESTEST
Euler method
Heun's method
analogia termiczna
analogia elektryczna
metoda Eulera
Opis:
The lumped capacitance method is widely used in dynamic modelling of buildings. Models differ in complexity, solution methods and ability to simulate transient behaviour of described objects. The paper presents a mathematical description of a simple 1R1C thermal network model of a building zone. Four numerical methods were applied to solve differential equation describing its dynamics. For validation purposes two test cases (600 and 900) from the BESTEST procedure were used. In both cases detailed results were given. Better ability of the simulation model to reproduce transient behaviour of the modelled buildings was noticed in case of the lightweight object (case 600). Annual heating and cooling demand was within the reference range for heavyweight one (case 900). The kind of the computation method had no significant effect on simulation results.
Źródło:
Journal of Mechanical and Energy Engineering; 2020, 4, 2; 179--188
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An extended dynamic thermal model of a permanent magnet excited synchronous motor
Autorzy:
Mbo'o, Ch. P.
Hameyer, K.
Powiązania:
https://bibliotekanauki.pl/articles/140883.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal modeling
thermal network
finite element method
iron losses
permanent magnet excited synchronous machine (PMSM)
Opis:
The purpose of this paper is to develop a dynamic thermal model of a permanent magnet excited synchronous motor (PMSM). The model estimates the temperature at specific points of the machine during operation. The model is implemented using thermal network theory, whose parameters are determined by means of analytical approaches. Usually thermal models are initialized and referenced to room temperature. However, this can lead to incorrect results, if the simulations are performed when the electrical machine operates under “warm” conditions. An approach is developed and discussed in this paper, which captures the model in critical states of the machine. The model gives feedback by online measured quantities to estimate the initial temperature. The paper provides an extended dynamic thermal model, which leads to a more accurate and more efficient thermal estimation.
Źródło:
Archives of Electrical Engineering; 2013, 62, 3; 375-386
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of work environment on thermal state of electric mine motors
Autorzy:
Krok, R.
Powiązania:
https://bibliotekanauki.pl/articles/140392.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silnik elektryczny
maszyna górnicza
metoda sieci termicznych
maszyna elektryczna
wyrobisko górnicze
electrical mining motors
thermal network method
exploitation of electric machines
coal mine undergrounds
Opis:
The paper presents a model for calculations of the temperature field in electric mine motors with a water cooled frame. That model was worked out with use of modified and improved thermal networks developed by the author for determining the temperature distributions in different types of ac machines. Thermal calculations for a selected type of 400 kW mining motor were performed with use of an original computer program. Their results were compared with those obtained from measurements. On the basis of the verified simulation results there was determined the influence of value changes of parameters characterising the work environment condition (ambient temperature, inlet temperature and cooling water discharge, degree of covering the casing with coal dust) on the mining motor thermal state.
Źródło:
Archives of Electrical Engineering; 2011, 60, 3; 357-370
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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