Relevant bibliographies by topics / Transient thermal simulations

Academic literature on the topic 'Transient thermal simulations'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Transient thermal simulations"

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Hahn, Luzia, and Peter Eberhard. "Transient Dynamical-Thermal-Optical System Modeling and Simulation." EPJ Web of Conferences 238 (2020): 12001. http://dx.doi.org/10.1051/epjconf/202023812001.

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In this work, methods and procedures are investigated for the holistic simulation of the dynamicalthermal behavior of high-performance optics like lithography objectives. Flexible multibody systems in combination with model order reduction methods, finite element thermal analysis and optical system analyses are used for transient simulations of the dynamical-thermal behavior of optical systems at low computational cost.
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Julianto, Eko, Waluyo Adi Siswanto, and Pebli Hardi. "Thermal Transient and Thermal Stress on Radiated Heat Float Glass." JSE Journal of Science and Engineering 1, no. 1 (January 31, 2020): 1–6. http://dx.doi.org/10.30650/jse.v1i1.150.

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To conduct an experiment of thermal radiation. The researchers conducted a simulation to study the behavior of the damage float glass using Mecway 10 FEA software. The ambient time and temperature on the first float glass sheet sustaining thermal transient and thermal stress are the most important parameters to find out the part of float glass. Analyzing the results of all simulations of radiant heat and convection in transient thermal simulations on the surface of float glass to be crack and knowing the estimated time until cracked float glass with thermal stress analysis. Giving heat radiation to the exposed glass surface, to be assumed by heat exposure from 0 to 20 minutes which is 32º to 600ºC with 19 mm glass thickness using Mecway 10 FEA software. Then did a comparison of the radiation heat value convection flow rate and so that the glass experiences a thermal crack. In this process, the results of the comparison will also be reviewed and discussed at the limit of the amount of heat radiation so that the cracked glass or thermal crack. The difference in temperature and stress will increase with adding radiation heat on the glass. Critical time and temperature differences are given as reference values ​​to predict Thermal stress in computerized applications.
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Faucher, Margaux, Davide Mancusi, and Andrea Zoia. "MULTI-PHYSICS TRANSIENT SIMULATIONS WITH TRIPOLI-4®." EPJ Web of Conferences 247 (2021): 07019. http://dx.doi.org/10.1051/epjconf/202124707019.

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In this work, we present the first dynamic calculations performed with the Monte Carlo neutron transport code TRIPOLI-4R with thermal-hydraulics feedback. For this purpose, the Monte Carlo code was extended for multi-physics capabilities and coupled to the thermal-hydraulics subchannel code SUBCHANFLOW. As a test case for the verification of transient simulation capabilities, a 3x3-assembly mini-core benchmark based on the TMI-1 reactor is considered with a pin-by-pin description. Two reactivity excursion scenarios initiated by control-rod movement are simulated starting from a critical state and compared to analogous simulations performed using the Serpent 2 Monte-Carlo code. The time evolution of the neutron power, fuel temperature, coolant temperature and coolant density are analysed to assess the multi-physics capabilities of TRIPOLI-4. The stabilizing e_ects of thermal-hydraulics on the neutron power appear to be well taken into account. The computational requirements for massively parallel calculations are also discussed.
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Huang, Yaren, Benedikt Lechner, and Gerhard Wachutka. "Comparative Numerical Analysis of the Robustness of Si and SiC PiN Diodes Against Cosmic Radiation-Induced Failure." Materials Science Forum 1004 (July 2020): 1088–96. http://dx.doi.org/10.4028/www.scientific.net/msf.1004.1088.

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This work aims at extending the predictive simulation technique for cosmic ray-induced failure analysis from Si PiN diodes [1] to SiC PiN diodes. Accurate 3D cylindrical-symmetric transient simulations were performed with a minimum mesh size of 20nm at the center track of the impinging ion and a maximum time step of 0.1ps during the development of the ion-induced transient current. We made a comparative study between a SiC PiN diode and a Si PiN diode with the same blocking voltage of 1.5kV, using the same heavy ion transportation models. In the simulation, we observed different ion-induced current transients, differing not only in the peak value of the current, but also in its duration. Due to different physical mechanisms, the dependence of the ion-induced current on the reverse pre-bias voltage and the numerical mesh adaptations are also different. Eventually, we brieflydiscuss electro-thermal simulations, which indicate once more that the ion-induced transient current in the SiC PiN diodes under consideration is primarily drift current and involves only negligible impact ionization.
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Holdampf, Sydney A., Andrew G. Osborne, and Mark R. Deinert. "Method to Estimate Thermal Transients in Reactors and Determine Their Parameter Sensitivities without a Forward Simulation." Energies 15, no. 19 (September 24, 2022): 7027. http://dx.doi.org/10.3390/en15197027.

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Thermal response time is an important parameter for the control of fast reactors. Modern thermal hydraulic codes allow for the modeling of transient responses and can also be used to understand the dominant factors that affect them. However, simulations can be computationally expensive, particularly for performing parametric analyses of how thermophysical properties affect transient behavior. Here, we present a method for using linear stability analysis to estimate thermal response time and determine the key parameters that affect transient behavior without performing a forward simulation. The approach can also be used to corroborate simulation results and is tested against simulation results produced with a 2D finite difference model. The results show that this approach produces time-dependent temperature profiles that are within 2 × 10−5–0.1% of the numerical results for a single node perturbation. Changes in temperature have the greatest effect on thermal response time, followed by changes to thermal conductivity.
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Vasilev, Aleksandr, Tommy Lorenz, and Cornelia Breitkopf. "Thermal Conductivity of Polyisoprene and Polybutadiene from Molecular Dynamics Simulations and Transient Measurements." Polymers 12, no. 5 (May 9, 2020): 1081. http://dx.doi.org/10.3390/polym12051081.

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The thermal conductivities of untreated polyisoprene and polybutadiene were calculated by molecular dynamics (MD) simulations using a Green-Kubo approach between −10 °C and 50 °C at atmospheric pressure. For comparison, the thermal conductivities of untreated polyisoprene with a molecular weight of 54,000 g/mol and untreated polybutadiene with a molecular weight of 45,000 g/mol were measured by the transient hot wire method in similar conditions. The simulation results of both polymers are in good agreement with the experimental data. We observed that the MD simulations slightly overestimate the thermal conductivity due to the chosen force field description. Details are discussed in the paper.
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Baddour, R. E. "Computer simulation of ice control with thermal-bubble plumes — line source configuration." Canadian Journal of Civil Engineering 17, no. 4 (August 1, 1990): 509–13. http://dx.doi.org/10.1139/l90-058.

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Thermal-bubble plumes in a freshwater environment are studied to determine their ice control capabilities. A computer model is developed to optimize the operation of thermal-bubble installations when designed to control ice. Steady-state and transient simulations of ice control are presented. It is conceivable to fully computerize the operation of thermal-bubble installations by combining data acquisition, data analysis, computer simulation, and control automation. Key words: ice control, ice management, thermal-bubble plume, computer simulation.
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Abdi, Ammar, Youcef Ouazir, Georges Barakat, and Yacine Amara. "Transient quasi-3D magneto-thermal analytical solution in PM induction heating device." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 39, no. 5 (May 23, 2020): 1131–44. http://dx.doi.org/10.1108/compel-01-2020-0054.

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Purpose This paper aims to develop a new quasi-three dimensional (3D) analytical model devoted to the study of nonlinear transient magneto-thermal coupled problems in permanent magnet (PM) transverse flux induction heating device (TFIHD). Design/methodology/approach The presented work is based on analytical development of strongly coupled problem, including electromagnetic and thermal boundary problems. The electromagnetic problem is first solved by using the separation variables method to evaluate the induced currents in the nonmagnetic plate and the resulting power density loss distribution. The plate temperature profile is then obtained thanks to strong involvement of this magnetic model in a new analytical thermal model combining the separation of variables method and the Green’s functions transient regime analysis method. The coupled model is then used in a simulation procedure of the magneto-thermal process allowing taking into account the workpiece electrothermal nonlinear properties. The developed coupled model is validated by computing the performances of the studied PM TFIHD and comparing them to those obtained by finite element simulations. Finding An efficient transient quasi-3D magneto-thermal analytical model is developed allowing rapid analysis of PM induction heating for core heating of parallelepiped parts. The developed model also allows fast and accurate simulations of nonlinear and transient three dimensional (3D) magneto-thermal phenomena for planar induction heaters. Research limitations implications The developed quasi-3D magneto-thermal analytical model is limited to design induction heating devices of planar structure with PM inductors. Originality/value A new transient quasi-3D magneto-thermal analytical model accounts for non-linearity and edge effect and helps to fast study and fast design of linear permanent magnet induction heating device.
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Reis, Patrícia A. L., Antonella L. Costa, Claubia Pereira, Maria Auxiliadora F. Veloso, and Amir Z. Mesquita. "Simulation of a TRIGA Reactor Core Blockage Using RELAP5 Code." Science and Technology of Nuclear Installations 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/354163.

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Cases of core coolant flow blockage transient have been simulated and analysed for the TRIGA IPR-R1 research reactor using the RELAP5-MOD3.3 code. The transients are related to partial and to total obstruction of the core coolant channels. The reactor behaviour after the loss of flow was analysed as well as the changes in the coolant and fuel temperatures. The behaviour of the thermal hydraulic parameters from the transient simulations was analysed. For a partial blockage, it was observed that the reactor reaches a new steady state operation with new values for the thermal hydraulic parameters. The total core blockage brings the reactor to an abnormal operation causing increase in core temperature.
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Hua, Yu-Chao, and Bing-Yang Cao. "Transient in-plane thermal transport in nanofilms with internal heating." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 472, no. 2186 (February 2016): 20150811. http://dx.doi.org/10.1098/rspa.2015.0811.

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Wide applications of nanofilms in electronics necessitate an in-depth understanding of nanoscale thermal transport, which significantly deviates from Fourier's law. Great efforts have focused on the effective thermal conductivity under temperature difference, while it is still ambiguous whether the diffusion equation with an effective thermal conductivity can accurately characterize the nanoscale thermal transport with internal heating. In this work, transient in-plane thermal transport in nanofilms with internal heating is studied via Monte Carlo (MC) simulations in comparison to the heat diffusion model and mechanism analyses using Fourier transform. Phonon-boundary scattering leads to larger temperature rise and slower thermal response rate when compared with the heat diffusion model based on Fourier's law. The MC simulations are also compared with the diffusion model with effective thermal conductivity. In the first case of continuous internal heating, the diffusion model with effective thermal conductivity under-predicts the temperature rise by the MC simulations at the initial heating stage, while the deviation between them gradually decreases and vanishes with time. By contrast, for the one-pulse internal heating case, the diffusion model with effective thermal conductivity under-predicts both the peak temperature rise and the cooling rate, so the deviation can always exist.
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Dissertations / Theses on the topic "Transient thermal simulations"

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Svantesson, Einar. "Transient thermal management simulations of complete heavy-duty vehicles." Thesis, KTH, Mekanik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-266464.

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Transient vehicle thermal management simulations have the potential to be an important tool to ensure long component lifetimes in heavy-duty vehicles, as well as save development costs by reducing development time. Time-resolved computational fluid dynamics simulations of complete vehicles are however typically very computationally expensive, and approximation methods must be employed to keep computational costs and turn-around times at a reasonable level. In this thesis, two transient methods are used to simulate two important time-dependent scenarios for complete vehicles; hot shutdowns and long dynamic drive cycles. An approach using a time scaling between fluid solver and thermal solver is evaluated for a short drive cycle and heat soak. A quasi-transient method, utilizing limited steady-state computational fluid dynamics data repeatedly, is used for a long drive cycle. The simulation results are validated and compared with measurements from a climatic wind tunnel. The results indicate that the time-scaling approach is appropriate when boundary conditions are not changing rapidly. Heat-soak simulations show reasonable agreement between three cases with different thermal scale factors. The quasi-transient simulations suggest that complete vehicle simulations for durations of more than one hour are feasible. The quasi-transient results partly agree with measurements, although more component temperature measurements are required to fully validate the method.
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Ahmed, Saad Verfasser], Hermann [Gutachter] [Rottengruber, and Dominique [Gutachter] Thévenin. "Modular methodology for transient vehicle thermal management simulations / Saad Ahmed ; Gutachter: Hermann Rottengruber, Dominique Thévenin." Magdeburg : Universitätsbibliothek Otto-von-Guericke-Universität, 2021. http://d-nb.info/1238779964/34.

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Rodríguez, Pérez Ivette. "Unsteady laminar convection in cylindrical domains: numerical studies and application to solar water storage tanks." Doctoral thesis, Universitat Politècnica de Catalunya, 2006. http://hdl.handle.net/10803/6689.

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Los dispositivos de almacenamiento de energía térmica son ampliamente usados en diversos sistemas térmicos caracterizados por un desfase temporal entre la producción de energia y su consumo, como es el caso de los sistemas de energía solar térmica. El diseño optimizado de estos equipos puede representar un considerable aumento en el rendimiento térmico de la instalación de la cual forman parte. En la línea de optimización de sistemas y equipos térmicos, en los últimos años la Mecánica de Fluidos Computacional (CFD) se ha consolidado como una herramienta básica, proporcionando a investigadores e ingenieros un método para ensayar virtualmente sus diseños, disminuyendo los costes en términos de tiempo, recursos y personal. Es en esta línea se encuentran las principales aportaciones de esta tesis, la cual tiene como principal objetivo la simulación numérica de procesos de convección laminar en régimen transitorio y dominios cilíndricos para su aplicación al estudio de los fenómenos de transferencia de calor y dinámica de fluidos que tienen lugar en los tanques de almacenamiento de energía.

Se presenta la metodología seguida para la resolución de las ecuaciones gobernantes de la transferencia de calor y dinámica de fluidos en coordenadas cilíndricas, mostrando las principales particularidades de su discretización para este tipo de geometrías y se detalla el tratamiento realizado para resolver estas singularidades dentro del código numérico. Posteriormente, se expone la metodología para la solución de flujos transitorios e incompresibles y se realiza un riguroso proceso de verificación del código y las soluciones numéricas obtenidas.

Esta metodología se aplica al estudio del comportamiento de los tanques de almacenamiento de energía estratificados. Un aspecto básico del funcionamiento de estos equipos es la calidad de la energía almacenada. Esta calidad viene determinada por el grado de estratificación térmica, en la cual influyen diferentes factores como la mezcla que ocurre debido a las corrientes de fluido que entran durante los procesos de carga y descarga térmica y también debido al intercambio de calor con el ambiente. En este sentido, en este trabajo se analiza la estratificación térmica para diferentes condiciones de trabajo y configuraciones por medio de las simulaciones numéricas multidimensionales. Para medir el grado de estratificación se han tenido en cuenta diferentes parámetros y como resultado del estudio, se propone un parámetro adimensional basado en un análisis exergético. Esta exergía adimensional ha permitido comparar el funcionamiento de los tanques en las diferentes situaciones analizadas y se ha mostrado útil para cuantificar la calidad de la energía almacenada.

Por otra parte, se estudia el comportamiento térmico de los tanques de almacenamiento durante su modo de operación estático y considerando las pérdidas de energía al ambiente. Este estudio tiene como objetivo fundamental caracterizar el proceso de enfriamiento del fluido en tanques que forman parte de sistemas solares térmicos para el rango de bajas y medianas temperaturas. Se presenta la metodología seguida para el análisis, desde la identificación de los números adimensionales que definen el problema, la formulación de un modelo zonal para la predicción del comportamiento térmico, el estudio paramétrico llevado a cabo y el posterior post-proceso de los resultados con el objetivo de proporcionar los parámetros necesarios para alimentar el modelo zonal. El modelo propuesto, junto con las correlaciones obtenidas, predicen correctamente el comportamiento del fluido, constituyendo una alternativa interesante para reproducir el proceso de enfriamiento del fluido en los tanques durante largos periodos de tiempo.
Thermal storage devices are widely used in many thermal systems and applications that are characterised by the delay between energy production and consumption, such as thermal solar systems. The improvement in their design and optimisation is a key aspect in the thermal optimisation of the system, where a good preformance of the storage tank can represent a considerable increase in the overall efficiency of the installation. In the subject of optimisation of thermal equipment, Computational Fluid Dynamics have been consolidated as an indispensable tool providing researchers and engineers with a method to test virtually their prototypes with low effort in time, personnel and resources. This thesis is focused in the numerical simulation of unsteady laminar convection in cylindrical domains and its application to the study of the heat transfer and fluid flow that take place in stratified storage tanks.

The first part of this document is devoted to present the methodology followed for the numerical resolution of the governing equation of heat and fluid flow in cylindrical coordinates. The main particularities of the discretisation of the equations in these geometries, as well as the solution procedure for incompressible and transient flow problems are also presented. Special emphasis is given to the verification of the code, the appropriateness of the discretisation adopted and the verification of the numerical solution obtained.

The second part of this thesis is focused on the study of the heat transfer and fluid flow phenomena that take place in stratified storage tanks, including the performance measures and modeling efforts of these devices. The quality of the energy stored is determined by the degree of the thermal stratification of the storage tank, which is affected by several factors such as the mixing due to the inlet streams during load and unload, the heat losses to the environment, among others. In this sense, thermal stratification analysis is carried out by means of the virtual prototyping of the tanks for different working conditions and configurations. In order to measure the performance of the tanks, different parameters are considered. The analysis led to the proposition of a new exergy-based parameter as a tool for assessing and comparing storage tanks. The usefulness of this parameter for quantifying the quality of the energy stored is also shown.

Furthermore, the thermal behaviour of storage tanks during the static mode of operation considering the heat losses to the environment is also analysed. The study is addressed to characterise the cool down of the fluid inside storage tanks for solar thermal systems in the low-to-medium temperature range. The methodology followed, from the identification of the significant non-dimensional parameters that define the problem, the formulation of a zonal prediction model, a parametric numerical study by means of detailed multidimensional CFD computations and the post-processing of the results in order to feed the global model are exposed in detail. Zonal model presented, together with the correlations given are in good agreement with the numerical results and constitute an alternative for the prediction of the long-term performance of the storage tanks during the cooling process.
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Di, Santo Dario. "Study of anabatic flows using large-eddy simulations in a simplified geometry." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20762/.

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In the present work, the turbulent anabatic flow generated over a uniformly heated slope in neutral stratification is originally studied through a large-eddy simulation (LES) technique. The present study is, to the best of the author's knowledge, the first case of a LES applied to anabatic flows in neutral stratification. The simulation approach is succesfully validated against three data sets: experimental, DNS and theoretical. One of the primary objectives of the study is to characterise the instantaneous turbulent structures triggered by the vertical buoyancy force responsible for the increase the turbulent mixing in the boundary layer. Such structures are hardly detected in both field and laboratory experiments and cannot be reproduced by steady-state numerical simulations. A new expression of the characteristic length scale of the thermal boundary layer is proposed and applied to derive alternative scaling parameters. Three principal regions are detected in the near-surface temperature profiles: a conduction region that contains most of the temperature decrease, a convective region dominated by flow convection and an equilibrium region that is almost not influenced by the heated slope. The newly proposed length scale resulted to be linked to the evolution of instantaneous turbulent structures identified as Rayleigh-Taylor instabilities which are analyzed and described. Their characteristic frequency is determined through a spectral analysis and their geometric dimensions are studied and linked to the extension of the vertical mixing zone inside the convection region. Three simulations are performed at different Rayleigh numbers to understand if there is a critical value above which the anabatic flow results Rayleigh-independent. the sensitivity analysis is carried out concluding that the analyzed flows are not Rayleigh-independent.
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Donovan, Adam. "Vehicle Level Transient Aircraft Thermal Management Modeling and Simulation." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1472236965.

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Karami, Peyman. "Robust and Durable Vacuum Insulation Technology for Buildings." Doctoral thesis, KTH, Byggnadsteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176494.

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Today’s buildings are responsible for 40% of the world’s energy use and also a substantial share of the Global Warming Potential (GWP). In Sweden, about 21% of the energy use can be related to the heat losses through the climatic envelope. The “Million Program” (Swedish: Miljonprogrammet) is a common name for about one million housing units, erected between 1965 and 1974 and many of these buildings suffer from poor energy performance. An important aim of this study was to access the possibilities of using Vacuum Insulation Panels (VIPs) in buildings with emphasis on the use of VIPs for improving the thermal efficiency of the “Million Program” buildings. The VIPs have a thermal resistance of about 8-10 times better than conventional insulations and offer unique opportunities to reduce the thickness of the thermal insulation. This thesis is divided into three main subjects. The first subject aims to investigate new alternative VIP cores that may reduce the market price of VIPs. Three newly developed nanoporous silica were tested using different steady-state and transient methods. A new self-designed device, connected to a Transient Plane Source (TPS) instrument was used to determine the thermal conductivity of granular powders at different gaseous pressure combined with different mechanical loads. The conclusion was that the TPS technique is less suitable for conducting thermal conductivity measurements on low-density nanoporous silica powders. However, deviations in the results are minimal for densities above a limit at which the pure conduction becomes dominant compared to heat transfer by radiation. The second subject of this work was to propose a new and robust VIP mounting system, with minimized thermal bridges, for improving the thermal efficiency of the “Million Program” buildings. On the basis of the parametric analysis and dynamic simulations, a new VIP mounting system was proposed and evaluated through full scale measurements in a climatic chamber. The in situ measurements showed that the suggested new VIP technical solution, consisting of 20mm thick VIPs, can improve the thermal transmittance of the wall, up to a level of 56%. An improved thermal transmittance of the wall at centre-of-panel coordinate of 0.118 to 0.132 W m-2K-1 and a measured centre-of-panel thermal conductivity (λcentre-of-panel) of 7 mW m-1K-1 were reached. Furthermore, this thesis includes a new approach to measure the thermal bridge impacts due to the VIP joints and laminates, through conducting infrared thermography investigations. An effective thermal conductivity of 10.9 mW m-1K-1 was measured. The higher measured centre-of-panel and effective thermal conductivities than the published centre-of-panel thermal conductivity of 4.2 mW m-1K-1 from the VIP manufacturer, suggest that the real thermal performance of VIPs, when are mounted in construction, is comparatively worse than of the measured performance in the laboratory. An effective thermal conductivity of 10.9 mW m-1K-1 will, however, provide an excellent thermal performance to the construction. The third subject of this thesis aims to assess the environmental impacts of production and operation of VIP-insulated buildings, since there is a lack of life cycle analysis of whole buildings with vacuum panels. It was concluded that VIPs have a greater environmental impact than conventional insulation, in all categories except Ozone Depilation Potential. The VIPs have a measurable influence on the total Global Warming Potential and Primary Energy use of the buildings when both production and operation are taken into account. However, the environmental effect of using VIPs is positive when compared to the GWP of a standard building (a reduction of 6%) while the PE is increased by 20%. It was concluded that further promotion of VIPs will benefit from reduced energy use or alternative energy sources in the production of VIP cores while the use of alternative cores and recycling of VIP cores may also help reduce the environmental impact. Also, a sensitivity analysis of this study showed that the choice of VIPs has a significant effect on the environmental impacts, allowing for a reduction of the total PE of a building by 12% and the GWP can be reduced as much as 11% when considering both production and operation of 50 yes. Finally, it’s possible to conclude that the VIPs are very competitive alternative for insulating buildings from the Swedish “Million Program”. Nevertheless, further investigations require for minimizing the measurable environmental impacts that acquired in this LCA study for the VIP-insulated buildings.
Dagens byggnader ansvarar för omkring 40% av världens energianvändning och  står också för en väsentlig del av utsläppen av växthusgaser. I Sverige kan ca 21 % av energianvändningen relateras till förluster genom klimatskalet. Miljonprogrammet är ett namn för omkring en miljon bostäder som byggdes mellan 1965 och 1974, och många av dessa byggnader har en dålig energiprestanda efter dagens mått. Huvudsyftet med denna studie har varit att utforska möjligheterna att använda vakuumisoleringspaneler (VIP:ar) i byggnader med viss fokus på tillämpning i Miljonprogrammets byggnader. Med en värmeledningsförmåga som är ca 8 - 10 gånger bättre än för traditionell isolering erbjuder VIP:arna unika möjligheter till förbättrad termisk prestanda med minimal isolerings tjocklek. Denna avhandling hade tre huvudsyften. Det första var att undersöka nya alternativ för kärnmaterial som bland annat kan reducera kostnaden vid produktion av VIP:ar. Tre nyutvecklade nanoporösa kiselpulver har testats med olika stationära och transienta metoder. En inom projektet utvecklad testbädd som kan anslutas till TPS instrument (Transient Plane Source sensor), har använts för att mäta värmeledningsförmågan hos kärnmaterial för VIP:ar, vid varierande gastryck och olika mekaniska laster. Slutsatsen blev att transienta metoder är mindre lämpliga för utföra mätningar av värmeledningsförmåga för nanoporösa kiselpulver låg densitet. Avvikelsen i resultaten är dock minimal för densiteter ovan en gräns då värmeledningen genom fasta material blir dominerande jämfört med värmeöverföring genom strålning. Det andra syftet har varit att föreslå ett nytt monteringssystem för VIP:ar som kan användas för att förbättra energieffektiviteten i byggnader som är typiska för Miljonprogrammet. Genom parametrisk analys och dynamiska simuleringar har vi kommit fram till ett förslag på ett nytt monteringssystem för VIP:ar som har utvärderats genom fullskaleförsök i klimatkammare. Resultaten från fullskaleförsöken visar att den nya tekniska lösningen förbättrar väggens U-värde med upp till 56 %. En förbättrad värmegenomgångskoefficienten för väggen i mitten av en VIP blev mellan 0.118 till 0,132 W m-2K-1 och värmeledningstalet centre-av-panel 7 mW m-1K-1 uppnåddes. Detta arbete innehåller dessutom en ny metod för att mäta köldbryggor i anslutningar med hjälp av infraröd termografi. En effektiv värmeledningsförmåga för 10.9 mW m-1K-1 uppnåddes. Resultaten tyder även på att den verkliga termiska prestandan av VIP:ar i konstruktioner är något sämre än mätvärden för paneler i laboratorium. En effektiv värmeledningsförmåga av 10.9 mW m-1K-1 ger dock väggkonstruktionen en utmärkt termisk prestanda. Det tredje syftet har varit att bedöma miljöpåverkan av en VIP-isolerad byggnad, från produktion till drift, eftersom en livscykelanalys av hela byggnader som är isolerade med vakuumisoleringspaneler inte har gjorts tidigare. Slutsatsen var att VIP:ar har en större miljöpåverkan än traditionell isolering, i alla kategorier förutom ozonnedbrytande potential. VIP:ar har en mätbar påverkan på de totala utsläppen av växthusgaser och primärenergianvändningen i byggnader när både produktion och drift beaktas. Miljöpåverkan av de använda VIP:arna är dock positiv jämfört med GWP av en standardbyggnad (en minskning med 6 %) medan primärenergianvändningen ökade med 20 %. Slutsatsen var att ytterligare användning av VIP:ar gynnas av reducerad energiförbrukning och alternativa energikällor i produktionen av nanoporösa kiselpulver medan användningen av alternativa kärnmaterial och återvinning av VIP kärnor kan hjälpa till att minska miljöpåverkan. En känslighetsanalys visade att valet av VIP:ar har en betydande inverkan på miljöpåverkan, vilket ger möjlighet att reducera den totala användningen av primärenergi i en byggnad med 12 % och utsläppen av växthusgaser kan vara minska, så mycket som 11 % när det gäller både produktion och drift under 50 år. Avslutningsvis är det möjligt att dra slutsatsen att VIP:ar är ett mycket konkurrenskraftigt alternativ för att isolera byggnader som är typiska för Miljonprogrammet. Dock krävs ytterligare undersökningar för att minimera de mätbara miljöeffekter som förvärvats i denna LCA-studie för VIP-isolerade byggnader.

QC 20151109


Simulations of heat and moisture conditions in a retrofit wall construction with Vacuum Insulation Panels
Textural and thermal conductivity properties of a low density mesoporous silica material
A study of the thermal conductivity of granular silica materials for VIPs at different levels of gaseous pressure and external loads
Evaluation of the thermal conductivity of a new nanoporous silica material for VIPs – trends of thermal conductivity versus density
A comparative study of the environmental impact of Swedish residential buildings with vacuum insulation panels
ETICS with VIPs for improving buildings from the Swedish million unit program “Miljonprogrammet”
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7

BARRETO, ARTHUR ANDRE LETO. "SIMULATION OF THERMAL EFFICIENCY AT TWO STROKES PROPULSION ENGINES UNDER TRANSIENT TORQUE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=14547@1.

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PETRÓLEO BRASILEIRO S. A.
Atualmente o motor diesel é a propulsão básica utilizada por navios mercantes. Predominantemente o arranjo mais utilizado é o de um motor de dois tempos turboalimentado diretamente acoplado ao hélice. Estes motores são controlados por um regulador de velocidade onde um valor desejado da rotação é ajustado. O regulador opera acionando as réguas das bombas injetoras, movendo-as conforme a necessidade de manter a rotação desejada mesmo sob torque transiente. Se o rendimento térmico é reduzido, os índices das bombas injetoras terão que operar em valores mais altos, quando comparado ao funcionamento do motor com o rendimento térmico de projeto, e neste caso maior geração de fuligem deverá ocorrer. Em motores de combustão interna, a deposição de fuligem trás consequências à manutenção e eficiência do motor, e por isto os operadores possuem motivos para evitar este tipo de mecanismo. Este trabalho propõe um modelo termodinâmico dotado de sub modelo para regulador de velocidade e para a fluturação do torque, o que permite observar o rendimento térmico nas condições de transiência. Dados adquiridos por um sistema de aquisição de dados fornece as condições de contorno para ajustar o modelo proposto.
The marine diesel engine is today’s predominant prime mover for ships propulsion. For the modern merchant vessels, the arrangement of a single slow speed turbocharged two stroke diesel engine directly coupled is used. The task of control these engines are done by speed governors, where a fixed rotational speed is set. The governor works holding the adjusted value even under transient loads, moving the fuel pump rack when necessary. When vessel operates in harsh weather conditions, the propellers may be subjected to large thrust and torque fluctuations. These fluctuations are generated by the propeller periodic change of submergence condition which leads to ventilation (air suction) and partial or full propeller emergence, at same time the rudder action to keep the route introduce another torque fluctuation. Thus, propulsion turbocharged two strokes engines runs under transient load could run with low fuel/air ratio, once the turbocharger can not be able to cover this transient range with appropriate response time. Some models from literature, like control and thermodynamics models are examined and adjusted with sub models for transient torque simulation. One thermodynamic model dotted of sub models for governor, and transient load is proposed and the thermal efficiency under transient torque observed. Data from monitored vessel’s engine under operation, supplied the boundaries conditions to adjust the proposed model.
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CHUMIOQUE, JOSE JAIME RAVELO. "SIMULATION OF A COOLING SYSTEM OF WITH THERMAL STORAGE OPERATING IN TRANSIENT REGIME." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5701@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
O presente trabalho versa sobre o estudo e modelagem de um sistema de refrigeração para ar condicionado de edifícios. O modelo considera um sistema de compressão de vapor de grande porte, chamado habitualmente chiller; um tanque de armazenamento de água gelada e uma torre de resfriamento.Para o desenvolvimento do modelo utilizam-se as equações constitutivas e as equações de conservação da massa e energia em todos seus componentes.O modelo permite obter as condições de funcionamento ótimo do sistema de refrigeração reduzindo o tamanho de seus componentes (menor custo de investimento) e o consumo de energia (custo de operação) em correspondência com o diagrama de carga térmica do edifício.Consideram-se as variações da temperatura do meio ambiente ao longo do dia (transiente horário) para estudar a influência destas variações no desempenho global do sistema de refrigeração.Aplica-se o modelo à obtenção das características dos componentes do sistema de refrigeração para condicionamento de ar de um dos blocos do prédio Cardeal Leme da PUC-Rio.No presente estudo, a estratégia de operação usada é um fator decisivo na seleção da melhor alternativa econômica.
The present work aims the study and modeling of a system of refrigeration systems for air-conditioning in buildings. The model considers a high capacity vapor-compression refrigeration system, for water cooling (chiller); a tank of thermal storage tank and a cooling tower.For the development of the model the constitutive equations and the equations of conservation of mass and energy are used over all its components.The model provides the optimal operating conditions of the refrigeration system to reduce the size of its components (lesser cost of investment) and the energy consumption (operation cost) according to the thermal load of the building.Daily temperature variations of the environment are taken into account (hourly transient) in order to study the influence of these variations over the global performance of the refrigeration system.The model is applied to the study of the air conditioning system of one block of the Cardeal Leme building, at PUC-Rio.In the present study, the strategy employed is a keye factor in the selection of the best economical alternative.
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9

Kocer, Gulru. "Aerothermodynamic Modeling And Simulation Of Gas Turbines For Transient Operating Conditions." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609642/index.pdf.

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In this thesis, development of a generic transient aero-thermal gas turbine model is presented. A simulation code, gtSIM is developed based on an algorithm which is composed of a set of differential equations and a set of non-linear algebraic equations representing each gas turbine engine component. These equations are the governing equations which represents the aero-thermodynamic process of the each engine component and they are solved according to a specific solving sequence which is defined in the simulation code algorithm. At each time step, ordinary differential equations are integrated by a first-order Euler scheme and a set of algebraic equations are solved by forward substitution. The numerical solution process lasts until the end of pre-defined simulation time. The objective of the work is to simulate the critical transient scenarios for different types of gas turbine engines at off-design conditions. Different critical transient scenarios are simulated for two di®
erent types of gas turbine engine. As a first simulation, a sample critical transient scenario is simulated for a small turbojet engine. As a second simulation, a hot gas ingestion scenario is simulated for a turbo shaft engine. A simple proportional control algorithm is also incorporated into the simulation code, which acts as a simple speed governor in turboshaft simulations. For both cases, the responses of relevant engine parameters are plotted and results are presented. Simulation results show that the code has the potential to correctly capture the transient response of a gas turbine engine under different operating conditions. The code can also be used for developing engine control algorithms as well as health monitoring systems and it can be integrated to various flight vehicle dynamic simulation codes.
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Schacht, Ralph. "Entwurf und Simulation von Makromodellen zur transienten Simulation von thermo-elektrischen Kopplungen in einem Netzwerksimulator." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965236099.

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Books on the topic "Transient thermal simulations"

1

Dutré, W. L. A European transient simulation model for thermal solar systems, EMGP2. Dordrecht, Holland: D. Reidel Pub. Co. for the Commission of the European Communities, 1985.

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K, Mikitiouk, U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research, Institut I︠A︡dernykh Reaktorov (Rossiĭskiĭ nauchnyĭ t︠s︡entr "Kurchatovskiĭ institut"), and Institut problem bezopasnogo ispolʹzovanii︠a︡ i︠a︡dernoĭ ėnergii (Rossiĭskiĭ nauchnyĭ t︠s︡entr "Kurchatovskiĭ institut"), eds. Modification of IPSN's SCANAIR fuel rod transient code for high burnup VVER fuel. Washington, DC: Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

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A, Shestopalov, U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research, Institut problem bezopasnogo ispolʹzovanii︠a︡ i︠a︡dernoĭ ėnergii (Rossiĭskiĭ nauchnyĭ t︠s︡entr "Kurchatovskiĭ institut"), and Institut I︠A︡dernykh Reaktorov (Rossiĭskiĭ nauchnyĭ t︠s︡entr "Kurchatovskiĭ institut"), eds. Modification of USNRC's FRAP-T6 fuel rod transient code for high burnup VVER fuel. Washington, DC: Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

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E, Boyack B., Giguere P. T, Los Alamos National Laboratory, and U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research., eds. A plan for the modification and assessment of TRAC-PF1/MOD2 for use in analyzing CANDU 3 transient thermal-hydraulic phenomena. Washington, D.C: Division of Systems Research, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1994.

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Dutré, W. L. A European Transient Simulation Model for Thermal Solar Systems: EMGP 2 (Solar Energy R&D in the Ec Series A:). Springer, 1985.

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Book chapters on the topic "Transient thermal simulations"

1

Barfusz, Oliver, Felix Hötte, Stefanie Reese, and Matthias Haupt. "Pseudo-transient 3D Conjugate Heat Transfer Simulation and Lifetime Prediction of a Rocket Combustion Chamber." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 265–78. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_17.

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Abstract Rocket engine nozzle structures typically fail after a few engine cycles due to the extreme thermomechanical loading near the nozzle throat. In order to obtain an accurate lifetime prediction and to increase the lifetime, a detailed understanding of the thermomechanical behavior and the acting loads is indispensable. The first part is devoted to a thermally coupled simulation (conjugate heat transfer) of a fatigue experiment. The simulation contains a thermal FEM model of the fatigue specimen structure, RANS simulations of nine cooling channel flows and a Flamelet-based RANS simulation of the hot gas flow. A pseudo-transient, implicit Dirichlet–Neumann scheme is utilized for the partitioned coupling. A comparison with the experiment shows a good agreement between the nodal temperatures and their corresponding thermocouple measurements. The second part consists of the lifetime prediction of the fatigue experiment utilizing a sequentially coupled thermomechanical analysis scheme. First, a transient thermal analysis is carried out to obtain the temperature field within the fatigue specimen. Afterwards, the computed temperature serves as input for a series of quasi-static mechanical analyses, in which a viscoplastic damage model is utilized. The evolution and progression of the damage variable within the regions of interest are thoroughly discussed. A comparison between simulation and experiment shows that the results are in good agreement. The crucial failure mode (doghouse effect) is captured very well.
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Zhang, Hui, Jun Li, and Xin Zhang. "Effects of Multi-factor on Casing Stress Under Transient Force-Thermal Coupling." In Computational and Experimental Simulations in Engineering, 1–13. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67090-0_1.

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Bilyaz, Serhat, Rahul Singh, Arash Karshenass, and Derek Baker. "Modeling and Transient Simulations of 30 MW Solar Thermal Electric Power Plants in the Northeast Mediterranean Region." In Progress in Clean Energy, Volume 2, 1099–114. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17031-2_73.

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Arshad, Adeel, Pouyan Talebizadehsardari, Muhammad Anser Bashir, Muhammad Ikhlaq, Mark Jabbal, Kuo Huang, and Yuying Yan. "Transient Simulation of Finned Heat Sinks Embedded with PCM for Electronics Cooling." In Advances in Heat Transfer and Thermal Engineering, 527–31. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4765-6_91.

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Mishra, Ankan, Sukhomay Pal, and Swarup Bag. "Electromagnetic Transient-Thermal Modeling of High-Frequency Induction Welding of Mild Steel Plates." In Advances in Simulation, Product Design and Development, 407–15. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9487-5_32.

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Arslanoglu, Nurullah, and Abdulvahap Yigit. "Simulation of Radiation Heat Flux Effect in Buildings on Human Thermal Comfort Under Transient Conditions." In Lecture Notes in Civil Engineering, 331–42. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-63709-9_26.

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Cho, JungChan. "SIMULATION – Improved prediction of tire cornering force and moment by using nonlinear viscoelasticity and transient thermal analysis through explicit FEM." In Proceedings, 899. Wiesbaden: Springer Fachmedien Wiesbaden, 2016. http://dx.doi.org/10.1007/978-3-658-14219-3_56.

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Kumar, Ashwani. "Low to High Speed Transient Structural and Thermal Temperature Measurement of Oil-Lubricated Multi-Speed Heavy Vehicle Transmission Gearbox System Based on FEA." In Advanced Numerical Simulations in Mechanical Engineering, 1–21. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3722-9.ch001.

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The main objective of this chapter is dynamic structural and thermal analysis of multi speed transmission gearbox (medium duty truck) using Finite Element Analysis (FEA). To evaluate the dynamic strength of transmission gearbox assembly transient structural analysis was performed. Dynamic varying loads at different rotational speed were applied to perform the transient analysis. In gear meshing operation at high rotational speed and loading condition, frictional heat is generated inside gearbox assembly. To reduce the effect of frictional heat, gear oil is used. In this research study gear oil SAE 85W140 was used for cooling and performance enhancement. Steady state thermal analysis was performed to evaluate the thermal effect of frictional heat, rotational speed of shafts (pinion, gear) and load with gear oil lubrication. In thermal effect gearbox surface temperature was measured at different points. FEA simulation results have been validated using experimental results available in literature.
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S. Leite, Brenno, Daniel J.O. Ferreira, Sibele A.F. Leite, and Vanessa F.C. Lins. "Numerical and Experimental Analysis of Thermochemical Treatment for the Liquefaction of Lemon Bagasse in a Jacketed Vessel." In Biomass [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94364.

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In this work, it was investigated the time evolution of thermal profile inside a liquefaction vessel and how the temperature and time of reaction influenced liquefaction yield. Liquefaction was performed in two different ways: (1) Experimental Analysis; (2) Numerical 3-D model, using Computational Fluid Dynamics (CFD). Liquefaction was performed using lemon bagasse samples, glycerol and sulphuric acid, as catalyst. Temperature and liquefaction Yield (LY) were measured for different time of reaction (30, 60 and 90 minutes). From experimental data, LY were higher than 70 wt% for 90 minutes reaction. The increase in the temperature inside the reactor occurred due to the conduction and natural convection phenomena. Although the jacketed vessel was fed with steam at 125°C, working conditions allowed the heating of the mixture to less than 100°C. CFD thermal profile was in accordance with experimental data. They showed it was necessary 60 minutes to achieve a steady state of heating in the mixture inside this liquefaction vessel. From CFD transient simulations, it was observed some oscillations and detachment from experimental data, which may be due to changes in fluids properties along the process. Despite this consideration CFD could satisfactory analyse heat transfer in this liquefaction process.
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Yin, S., M. Dusseault, and L. Rothenburg. "Transient ground movement simulation in thermal processes." In Rock Mechanics: Meeting Society's Challenges and Demands, 1701–9. Taylor & Francis, 2007. http://dx.doi.org/10.1201/noe0415444019-c214.

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Conference papers on the topic "Transient thermal simulations"

1

Vogiatzis, Konstantinos. "Transient aero-thermal simulations for TMT." In SPIE Astronomical Telescopes + Instrumentation, edited by George Z. Angeli and Philippe Dierickx. SPIE, 2014. http://dx.doi.org/10.1117/12.2056569.

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Parrino, Maurizio, Alberto Mannoni, Elvio Bonisoli, and Massimo Sorli. "Block-oriented Models for Transient HVAC Simulations." In Vehicle Thermal Management Systems Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-01-2002.

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Sorrell, Nina C., and Ayman I. Hawari. "TREAT Transient Modeling and Impact of Graphite Thermal Scattering." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81887.

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The Transient Reactor Test Facility (TREAT) is a high enriched, graphite moderated, air cooled reactor built for experimental transient fuel testing. Recently, the reactor was returned to operation after having been shut down since 1994. Transients at TREAT are controlled largely by control/transient rod movement and temperature feedback that is attributed to the core’s graphite-fuel matrix. To date, TREAT simulations use the standard ENDF/B-VII.1 graphite thermal neutron scattering cross sections that assume an ideal crystalline form for the core’s graphite. Historically, it has been reported that the use of these cross sections may result in a −2000 pcm discrepancy when attempting to predict TREAT criticality [1]. In this work, a multi-physics simulation of a TREAT transient is performed using the standard ENDF/B-VII.1 graphite thermal scattering cross section libraries and compared with results using graphite libraries that assume a porous graphite structure and a corresponding density consistent with TREAT graphite. The transient simulation methodology couples a full-core transient Monte Carlo calculation in the Serpent code with feedback calculated from temperature estimates derived using the computational fluid dynamics code OpenFOAM. Steady state simulations show that use of the “porous” graphite libraries allows predicting TREAT criticality to within a few hundred pcm. In the current transient simulations, the reactor’s time dependent power behavior is successfully reproduced. With this model, observables such as maximum fuel temperatures and temperature-dependent flux spectra are calculated, using both the traditional ENDF/B-VII.1 and the “porous” graphite thermal scattering libraries.
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Coppi, Gabriele, Zhilei Xu, Aamir Ali, Nicholas Galitzki, Patricio A. Gallardo, Andrew J. May, Jack L. Orlowski-Scherer, et al. "Cooldown strategies and transient thermal simulations for the Simons Observatory." In Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, edited by Jonas Zmuidzinas and Jian-Rong Gao. SPIE, 2018. http://dx.doi.org/10.1117/12.2312679.

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Oberg, A., J. Isberg, and K. E. Olsson. "Simulations of transient thermal and electrical behavior of contact spots." In Electrical Contacts - 1999. IEEE, 1999. http://dx.doi.org/10.1109/holm.1999.795940.

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Hu, Tianliang, Liangzhi Cao, Hongchun Wu, and Kun Zhuang. "Code Development for the Neutronics/Thermal-Hydraulics Coupling Transient Analysis of Molten Salt Reactors." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67316.

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A code system has been developed in this paper for the dynamics simulations of MSRs. The homogenized cross section data library is generated using the continuous-energy Monte-Carlo code OpenMC which provides significant modeling flexibility compared against the traditional deterministic lattice transport codes. The few-group cross sections generated by OpenMC are provided to TANSY and TANSY_K which is based on OpenFOAM to perform the steady-state full-core coupled simulations and dynamics simulation. For verification and application of the codes sequence, the simulation of a representative molten salt reactor core MOSART has been performed. For the further study of the characteristics of MSRs, several transients like the code-slug transient, unprotected loss of flow transient and overcooling transient have been analyzed. The numerical results indicated that the TANSY and TANSY_K codes with the cross section library generated by OpenMC has the capability for the dynamics analysis of MSRs.
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Shaikh, Javed, Mark Gallina, and Bijendra Singh. "A Comparative Study on Reduced System Thermal Models for Transient Simulations." In 2020 19th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2020. http://dx.doi.org/10.1109/itherm45881.2020.9190258.

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VanGilder, James W., Christopher M. Healey, Michael Condor, Wei Tian, and Quentin Menusier. "A Compact Cooling-System Model for Transient Data Center Simulations." In 2018 17th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2018. http://dx.doi.org/10.1109/itherm.2018.8419515.

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Belov, A., E. Gapionok, I. Gornikel, K. Ioki, V. Kukhtin, E. Lamzin, S. Sytchevsky, A. Terasawa, and Yu Utin. "Numerical Simulations of Transient Electromagnetic Processes for ITER Thermal Shield Design." In 2007 IEEE 22nd Symposium on Fusion Engineering. IEEE, 2007. http://dx.doi.org/10.1109/fusion.2007.4337892.

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Aoki, Takeshi, and Hiroyuki Sato. "Transient Thermal-Hydraulic Analysis for Thermal Load Fluctuation Test Using HTTR." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-91761.

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Abstract High temperature gas-cooled reactor (HTGR) has a potential to produce competitive and large amount of carbon-free hydrogen because of its capability to supply high temperature heat of nuclear energy. It is required to establish the control method and system for the HTGR hydrogen production system to maintain its normal operation against the abnormality in the hydrogen production facility. Performances of the control method and system such as readiness and stability have to be demonstrated by transient thermal-hydraulic analysis with a code developed based on RELAP5/MOD3 code. The reactor response against the disturbance in the reactor inlet coolant temperature is revealed in the HTGR hydrogen production system using the control systems. The analytical results showed that the reactor outlet coolant control system enabled to control the variation of the reactor outlet coolant temperature within 4°C against 30°C of large disturbance in the reactor inlet coolant temperature. A variation of the reactor outlet coolant temperature has to be less than 5°C in the simulation to maintain its normal operation in the HTGR hydrogen production system. Thus, the effectiveness of the control method was confirmed. The simulations code and results will be validated through a HTTR thermal load fluctuation test.
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Reports on the topic "Transient thermal simulations"

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Liu, X., Z. Chen, and S. E. Grasby. Using shallow temperature measurements to evaluate thermal flux anomalies in the southern Mount Meager volcanic area, British Columbia, Canada. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330009.

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Geothermal is a clean and renewable energy resource. However, locating where elevated thermal gradient anomalies exist is a significant challenge when trying to assess potential resource volumes during early exploration of a prospective geothermal area. In this study, we deployed 22 temperature probes in the shallow subsurface along the south flank of the Mount Meager volcanic complex, to measure the transient temperature variation from September 2020 to August 2021. In our data analysis, a novel approach was developed to estimate the near-surface thermal distribution, and a workflow and code with python language have been completed for the thermal data pre-processing and analysis. The long-term temperature variation at different depths can be estimated by modelling, so that the relative difference of deducing deeper geothermal gradient anomalies can be assessed. Our proposed inversion and simulation methods were applied to calculating the temperature variation at 2.0 meters depth. The results identified a preferred high thermal flux anomalous zone in the south Mount Meager area. By combining with previous studies, the direct analysis and estimation of anomalous thermal fields based on the collected temperature data can provide a significant reference for interpretation of the regional thermal gradient variation.
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NUMERICAL SIMULATION ANALYSIS OF TEMPERATURE FIELD OF BOX-TYPE COMPOSITE WALL. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.321.

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The spatial and temporal characteristics of the internal temperature field of the box-type composite wall have great significance to high temperature mechanical response and fire resistance performance of composite wall subjected to fire. A series of assumptions for the simplified model were made after determining the influence of various thermal parameters, the boundary conditions of surface and the contact conditions. And the finite element software(ABAQUS) was used to establish the temperature field analysis model to conduct nonlinear transient temperature response analysis, then the validity of the model was verified by relevant test results. On this basis, the distribution of temperature field during the whole process and its key measuring points under fire are analyzed, and the parameters of each component are researched. The results show that the thickness of rock wool, the type, the thickness and number of layers of cladding plates have obvious influence on the temperature field distribution inside the composite wall, and other factors have little effect. According to the analysis results, the fire-resistant design idea of the composite wall and the temperature prediction formulas of the key temperature-control point are proposed, which provide the basis for the application of the boxtype steel structure system.
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