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This paper presents a new approach in modelling a photovoltaic/thermal hybrid system based on Finite Element Method (FEM). Comsol Multiphysics, a commercial simulator based on FEM, and MATLAB simulation tools are used to implement this electro-thermal model. An optimization process takes place for the water back pipes regarding its material, shape and pipe diameter for maximum conversion efficiency...
A computer simulation has been developed to estimate the transient temperature and pressure distributions in a high-temperature superconducting (HTS) power cable cooled by a forced flow of subcooled $\mbox{LN}_{2} $. This simulation is critical for assessing the effects of short-circuit accidents in practical HTS power cables. When a fault occurs, an excessive current of 31.5 kA may flow in a cable...
Heat Transfer simulation in Permanent Magnet Synchronous Machines is mandatory in order to predict temperatures during the design phase. The temperatures in the machine condition the choice of the correct materials as well as the cost of the machine. As these machines are complex, a compromise between accuracy and computational cost is necessary. In this paper, we present two thermal Permanent Magnet...
This paper presents the analysis of temperature rise on PCB. Numerical solutions using Galerkin approach that is one of Finite Element Method (FEM) was used to study and analyze the temperature rise on PCB. Then, an algorithm has been developed using MATLAB. The PCB with four different width of copper is supplied with different range of direct current (DC) from 0.5 to 5 Amperes to capture the data...
On the basis of studying inter-thermal performance of U-tube solar collector, the transient efficiency and efficiency factor were got. As for analyzing the thermal performance of the collector from different angles, two models were developed. By using numerical method each part of the collector were got. Furthermore, by weighted least square method, the instantaneous efficiency of solar collector...
Direct water cooling has been used only in large size turbo generators. The method might, however, offer interesting possibilities also in high torque applications. The performance of different cooling fluids for internal liquid cooling of windings is assessed. The arctic operating conditions of machine place special requirements for the fluid thus pure water can not be used for cooling. It is found...
A novel flat micro heat pipe with glass fiber wick structure is introduced in this paper. The structure of the wick is presented and also the excellence of the structure is described. For the novel flat micro heat pipe, a mathematical model is founded and the maximum heat transports is calculated which is 2.3 w. Experimental testing is performed for the fabricated micro heat pipe in vacuum. The testing...
The aim of this paper is to show that commercial software is able to realize an utter thermal analysis of a quartz oscillator. SOLIDWORKS files of the mechanical assembly are simplified and exported into COMSOL. Based on the assumption that under vacuum the heat transfer process is the conduction, material properties and boundary conditions are filled in the different pop-up boxes to solve the conduction...
A physical yet analytical phase change memory (PCM) model simultaneously accounting for thermal and electrical conductivities is presented. Due to the physics based nature of the model, the essential temperature from heating and cooling of PCM during operation is instantaneously updated. More importantly, the model can be applied to non-conventional circuit design technique. We show that for the first...
In this paper a new approach for optimization of high frequency transformer design is presented. The presented design method is based on a restatement of the traditional transformer design equations to include non-sinusoidal switching waveforms and high frequency skin and proximity effects. In this optimization procedure both electric and thermal effects in the transformer is considered. Wave form...
Knowledge of the evolution of the resistance of a conductor during a short - circuit allows to measure the temperature of the conductor, and makes it possible to investigate new criteria that characterize short - circuit currents.
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