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    Wyświetlanie 1-8 z 8
    Tytuł:
    Energy efficiency analysis of railway turnout heating system with a melting snow model heated by classic and contactless heating method
    Autorzy:
    Flis, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/140565.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical heating
    enthalpy method
    experimental research
    melting process
    railway turnouts
    thermal field
    heat distribution
    Opis:
    Maintaining railway turnout operability is crucial for ensuring railway transport safety. Electric heating of railway turnouts is a significant technical and economic issue. The classical heating is characterised by high power consumption. For this reason, research is needed to optimise the current system. This paper presents results of a numerical analysis and of experimental researches. The numerical analysis was carried out using the ANSYS software. There was conducted a numerical comparative analysis of energy loss during heating performed using two different heaters. Including the classical method and a heater thermally insulated from a rail. In the first step, heating of a working space filled with a substitute snow model was considered. The snow-covered surface area was held within the working space of the turnout. It was assumed that the snow substitute material had thermal properties approximately the same as real light snow. It was also assumed that the material is in the solid state which would not undergo a phase change. In the next step, a real snow model that included the phase change process was taken into account. The energy efficiency and heat distribution in the turnout have been analysed and compared. The experimental researches were carried out in a physical model. The results showed that the use of a contactless heater results in creating a larger area over which emitted heat affected snow in the working space. Consequently, more snow was melted around the contactless heater than the classic one. This experimental observation supported the results of the numerical analyses presented previously.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 3; 511-520
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat dissipation and temperature distribution in long interconnect lines
    Autorzy:
    Gnidzińska, K.
    Mey, G.
    Napieralski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/199909.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    interconnect lines
    heat dissipation
    delay
    temperature distribution
    Opis:
    Thermal and time delay aspects of long interconnect lines have been investigated. To design a modern integrated circuit we need to focus on very long global interconnects in order to achieve the desired frequency and signal synchronization. The long interconnection lines introduce significant time delays and heat generation in the driver transistors. Introducing buffers helps to spread the heat production more homogenously along the line but consumes extra power and chip area. To ensure the functionality of the circuit, it is compulsory to give priority to the time delay aspect and then the optimized solution is found by making the power dissipation as homogenous as possible and consequently the temperature distribution T (relative to ambient) as low as possible. The technology used for simulations is 65 nm node. The occurring phenomena have been described in a quantitative and qualitative way.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 1; 119-124
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of heat transfer correlation on wet cylinder liner temperature distribution when converting an old engine into a turbocharged engine
    Autorzy:
    Trung, Kien Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/1955004.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer
    correlation
    turbocharged engine
    cylinder liner
    distribution
    Supercharging
    Opis:
    For conventional diesel engines, two of the most widely used global correlations are due to Woschni and Hohenberg. Besides, the modern diesel engines used a new heat transfer coefficient correlation was proposed by Finol and Robinson. In Vietnam, improving engine power density is a trend of improving non-turbocharged base engines by using a supercharging system with exhaust gas energy recovery. Increasing engine power by the turbocharger is limited for two reasons: mechanical stress and thermal stress of the components surrounding the combustion chamber. In general, the heat transfer coefficient has a major effect on heat transfer rate, especially during the combustion process. So, the purpose of this study is to compare the cylinder distribution results from the simulation using the equations of Woschni and Hohenberg and compare to the experiment results when converting an old heavy-duty engine into a turbocharged engine. Results show that the cylinder distribution using Hohenberg’s correlation has a good agreement with the experiment results, especially in the case of a turbocharged engine.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 3; 159-172
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of non-equidistant baffle spacing in a small shell and tube heat exchanger
    Autorzy:
    Aziz, Abdullah
    Rehman, Shafique
    Powiązania:
    https://bibliotekanauki.pl/articles/240423.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal distribution
    baffle spacing
    heat exchanger
    turbulence modeling
    CFD study
    Opis:
    Most of the formulations regarding the characteristics of a shell and tube heat exchanger have a common assumption; namely that the baffle plates are equidistant. This assumption fails to cater the real world scenario for defective baffles as the alteration in a shell and tube heat exchanger invalidates the equidistant baffle spacing of the plates. In this regard, a small six baffles heat exchanger was modeled in the computational fluid dynamics software package and studied by removing each baffle plate one at a time. Effect of removing each baffle plate on the temperature, pressure, heat transfer coefficient, and total heat transfer rate was recorded. It was observed that variation in the pressure drop for the same number of baffle plates varies along the axial order of the plates. The change in pressure drop due to the removal of the baffle plate near the inlet and the outlet was lowest and reaches a maximum in the axial center. It was also found that the plates below the radial center contribute higher towards the overall heat transfer as compared to those above.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 2; 201-221
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of temperature distribution in the ground
    Autorzy:
    Larwa, Barbara
    Kupiec, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/185407.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer
    temperature distribution in the ground
    heat balance at the ground
    surface
    wymiana ciepła
    rozkład temperatury w ziemi
    bilans cieplny na ziemi
    powierzchnia
    Opis:
    Knowledge of the temperature distribution in subsurface layers of the ground is important in thedesign, modelling and exploitation of ground heat exchangers. In this work a mathematical model ofheat transfer in the ground is presented. The model is based on the solution of the equation of transientheat transfer in a semi-infinite medium. In the boundary condition on the surface of the groundradiation fluxes (short- and long-wave), convective heat flux and evaporative heat flux are taken intoaccount. Based on the developed model, calculations were carried out to determine the impact ofclimatic conditions and the physical properties of the ground on the parameters of the Carslaw-Jeagerequation. Example results of calculated yearly courses of the daily average temperature of the surfaceof the ground and the amount of particular heat fluxes on the ground surface are presented. Thecompatibility of ground temperature measurements at different depths with the results obtained fromthe Carslaw–Jaeger equation is evaluated. It was found thatthe temperature distribution in the groundand its variability in time can be calculated with good accuracy.
    Źródło:
    Chemical and Process Engineering; 2019, 40, 1; 123--137
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of temperature and thermal stresses distribution in power boiler elements with use inverse heat conduction method
    Autorzy:
    Grądziel, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/240169.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metoda inwersji
    propagacja nacisków
    szybkozmienna temperatura
    współczynnik przenikania ciepła
    heat transfer coefficient
    inverse method
    stress distribution
    transient temperature
    Opis:
    The following paper presents the method for solving one-dimensional inverse boundary heat conduction problems. The method is used to estimate the unknown thermal boundary condition on inner surface of a thick-walled Y-branch. Solution is based on measured temperature transients at two points inside the element's wall thickness. Y-branch is installed in a fresh steam pipeline in a power plant in Poland. Determination of an unknown boundary condition allows for the calculation of transient temperature distribution in the whole element. Next, stresses caused by non-uniform transient temperature distribution and by steam pressure inside a Y-branch are calculated using the finite element method. The proposed algorithm can be used for thermal-strength state monitoring in similar elements, when it is not possible to determine a 3-D thermal boundary condition. The calculated temperature and stress transients can be used for the calculation of element durability. More accurate temperature and stress monitoring will contribute to a substantial decrease of maximal stresses that occur during transient start-up and shut-down processes.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 3; 191-200
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on transport packages used for food freshness preservation based on thermal analysis
    Autorzy:
    Yu, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/240937.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer theory
    logistics transportation
    Ansys Flotran
    temperature distribution
    teoria przenikania ciepła
    logistyka transportowa
    ANSYS Flotran
    rozkład temperatury
    Opis:
    In recent time, as the Chinese consumption level increases, the consumption quantity of high-value fruits, vegetables and seafood products have been increasing year by year. As a consequence, the traffic volume of refrigerated products also increases yearly and the popularization degree of the cold-chain transportation enhances. A low-temperature environment should be guaranteed during transportation, thus there is about 40% of diesel oil should be consumed by the refrigerating system and the cold-chain transportation becomes very costly. This study aimed to explore methods that could reduce the cost of transport packages of refrigerated products. On the basis of the heat transfer theory and the fluid mechanics theory, the heat exchanging process of corrugated cases during the operation of refrigerating system was analyzed, the heat transfer process of corrugated cases and refrigerator van was theoretically analyzed and the heat balance equation of corrugated cases was constructed.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 4; 121-135
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of platen superheaters in a circulating fluidized bed boiler at different loads
    Modelowanie grodziowych przegrzewaczy pary dla różnych obciążeń w kotle z cyrkulacyjnym złożem fluidalnym
    Autorzy:
    Madejski, P.
    Taler, D.
    Korzeń, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/172817.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wymiennik ciepła
    przegrzewacz pary
    cyrkulacyjne złoże fluidalne
    rozkład temperatury pary
    heat exchanger
    steam superheater
    circulating fluidized bed
    temperature distribution of steam
    Opis:
    Przegrzewacz pary drugiego stopnia jest to przegrzewacz grodziowy wykonany z rur „podwójną omega”. Przegrzewacz jako wymiennik ciepła, zbudowany jest z trzech biegów. Każdy bieg jest wykonany z innego gatunku stali niskostopowej. W artykule przedstawiono obliczenia rozkładu temperatur pary, jak również ścianki rury grodziowego przegrzewacza, dla rożnych obciążeń kotła z cyrkulacyjnym złożem fluidalnym (CFB).
    A second stage steam superheater is a platen superheater made from so-called ‘double omega’ tubes. The superheater is a three-pass tube heat exchanger. Each pass is made from different low-alloy steel. In the paper, the temperature distributions of the steam and tube wall in the platen superheater were computed at different partial loads of a circulating fluidized bed (CFB) boiler.
    Źródło:
    Archiwum Energetyki; 2012, 42, 2; 85-92
    0066-684X
    Pojawia się w:
    Archiwum Energetyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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