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In this paper are described some principles and new methods underlying the temperature adjustment in an laboratory electrical furnace. Due to high thermal inertia, classical Proportional-Integral-Derivative algorithms are difficult to be implemented when a high precision temperature adjustment is required. An original software algorithm written in C language performs the temperature control function,...
This article deals with the thermal analysis of traction transformer. The traction transformers are special kind of a transformers. The windings have lots of voltage terminals for various voltage levels and various supply systems. In the article is described the thermal mathematical model of traction transformer. The possibilities of simplification of calculation model and high accuracy of simulation...
A coupled-electro-thermal RDS(ON) (drain to source ON resistance) co-analysis methodology for Power MOSFET is proposed. The methodology contains two functional modules: 1) physical field solvers and 2) equivalent circuit/network solver. The field solver resolves the electrical and thermal field variables by the conventional 3D finite-element method, while the network solver can achieve accurate and...
The most energy in buildings is used for space cooling and heating. Thus, the thermal analysis is necessary to reach thermal comfort and energy efficiency in buildings. In this paper, we present a thermal envelope modeling based on thermal-electrical analogy for thermal behavior simulation. The research object is a real platform inside our laboratory building in France. To illustrate this study, two...
In smartphones and tablets, a number of components, such as display and communication subsystem, dissipate a significant amount of heat. This influences the SoC thermal envelope, because of the absence of a fan. Thus the thermal conditions of the SoC cannot simply be modeled as only a function of the SoC component power. In addition, contact surfaces and phone orientation variations (e.g., phone inside...
The reliability of the cable depends on production conditions and the insulation material. In this study, an EPR insulator specimen was fabricated for use in experiments. In addition, we selected the Arrhenius model, which is widely used for lifetime prediction, and the Weibull model for statistical analysis. The suitability between the two models was evaluated. The temperature change of material...
This paper presents a detailed cooling approach for traction motors which are mounted in hybrid electric vehicle (HEV) or battery electric vehicle (BEV). There are specific guidelines for the design of a traction motor in hybrid drives, such as the small and restricted packing area and on the other side, the need for a high power — and torque — density. For this vehicle powertrain application the...
Energy consumption by deployed United States Army troops has become an important issue. There is significant fiscal cost and risk of providing diesel fuel for generators due to precautions needed to defend fuel convoys. Photovoltaics can effectively reduce fuel requirements, but without battery storage introduce additional variability in demand due to their intermittent nature. A structurally insulated...
Since packages affect the amount of heat transfer, it is important to include package and heat sink in thermal analysis. In this paper, we study the full-chip thermal response with different packages. We first discuss the difficulties of obtaining accurate package models for simulation. To facilitate a designer to perform thermal simulation with different packages, we propose to use a matrix called...
The article presents thermal analysis of three-phase induction motor using coupled circuit models. The MATLAB/SIMULINK environment and PLECS toolbox were used to create mathematical model of the examined motor. Coefficient of heat transfer through the winding was set experimentally. Results of calculations presented are verified by the measurements on the physical motor.
This paper presents a methodology for the creation of reduced thermal models of electronic systems based on the knowledge of the system dynamic temperature response. The registration of thermal responses using equidistant sampling on a logarithmic time scale allows the proper identification of all the time constants in the responses. Knowing the entire time constant spectrum, it is possible to generate...
In this paper, the shape identification method in the Inverse Heat Conduction Problems (IHCP) is applied to estimate the shape of frost on a refrigeration tube. The inverse algorithm consists of direct, inverse analysis and gradient-based optimization method. The direct analysis used Finite Element Method (FEM) in an unstructured grid system to solve the direct heat conduction problem. The inverse...
As on-chip integration increases, the thermal distribution becomes spatially non-uniform and varies based on the power dissipation. In this paper, we introduce a temperature-aware task-mapping algorithm to prevent hotspots and achieve a highly uniform thermal distribution using adaptive multi-threshold values. The algorithm monitors the temperature of the cores, swaps tasks when the temperature of...
In this paper, the liquidus temperature of nNaF·AlF3-Al2O3-ZrO2 molten salt system was determined by thermal analysis method. The effects of molar ratio of NaF and AlF3, and ZrO2 concentration on the liquidus temperature were studied by orthogonal regression experimental design method. The results show that the trends of liquidus temperatures of melts with five different molar ratios of NaF and AlF...
This development shows the design and analysis of thermal control balance of a satellite in the GEO orbit. Keeping all subsystem of the spacecraft in the allowable range at all mission duration is the main goal of the thermal control subsystem. The purpose of the thermal design for a satellite is to keep all the elements of the satellite system within their temperature range limits for all mission...
This paper deals with the thermal and electrical modelling and simulation of an automotive high power battery cell. The electrical modelling is implemented for determining the electrical losses. The electrical losses are converted to heat losses and therefore a heat flow in the cell. The thermal modelling is based on a 1D implementation by means of discrete volume elements. The resulting simulation...
Modern high-performance processors employ thermal management systems, which rely on accurate readings of on-die thermal sensors. Systematic tools for analysis and determination of best allocation and placement of thermal sensors is therefore a highly relevant problem. This paper proposes a novel technique for determining the placement of temperature sensors on complex Multi-Processor Systems-on-Chips...
Lighting purpose organic light-emitting devices have to be answer to high electrical and thermal requirements. Design of these devices needs special engineering. The electrical current and dissipated power distribution in an OLED needs electro-thermal field simulation. The algorithm in our simulation tool, SUNRED, had to be extended to be able to handle highly nonlinear electrical OLED characteristics,...
The advent of 3D stacked ICs with accumulating heat fluxes stresses thermal reliability and is responsible for temperature driven performance deterioration of the electronic systems Hot spots with power densities typically rising up to 250 W/cm2 are not acceptable, with the result of limited performance improvement in next generation high-performance microprocessor stacks. Unfortunately traditional...
Static thermal analysis of a coil has been presented in this paper. The system for temperature measurement has been designed and described. The calculation results obtained by using finite element method analysis have been verified experimentally.
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