scholarly journals Thermal Analysis of Dry-Type Air-Core Coils for the Optimization of Passive Filtering Systems

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4540
Author(s):  
Josué Rodríguez D. ◽  
G. Alonso Orcajo ◽  
José M. Cano ◽  
Joaquín G. Norniella ◽  
Asier Vicente
Keyword(s):  
Thermal Analysis ◽  
Distribution Networks ◽  
The Finite Element Method ◽  
Industrial Facilities ◽  
Conventional Steel ◽  
Harmonic Currents ◽  
Air Core ◽  
Coil Temperature ◽  
Harmonic Filter ◽  
Magnetic Model

The analysis of harmonic currents in distribution networks of industrial facilities and the associated filtering stages is essential to optimize the production of these installations. Dry-type air-core reactors are one of the main elements of harmonic filter banks. A thermal analysis of these reactors in conventional steel plants and an evaluation of the criteria used to adjust the corresponding thermal protections are proposed in this paper. Accordingly, harmonic currents through the different filter branches are assessed. The proposed methodology builds a thermal magnetic model using the finite element method (FEM) whereby electromagnetic fields, currents and losses are emulated, to allow for recreating the actual coil temperature. The study aims at increasing the reliability of filtering systems by lowering the number of unscheduled shutdowns due to conservative adjustments of thermal protections.

Study of Birefringence and Mode Field for Hollow-Core Photonic Bandgap Fiber

2014 ◽  
Vol 609-610 ◽  
pp. 324-329
Author(s):  
Li Shuang Feng ◽  
Wen Shuai Song ◽  
Xiao Yuan Ren
Keyword(s):  
Field Distribution ◽  
Photonic Bandgap ◽  
Surface Mode ◽  
Hollow Core ◽  
The Finite Element Method ◽  
Core Mode ◽  
Photonic Bandgap Fiber ◽  
Mode Field ◽  
Air Core ◽  
Polarization Maintaining

Since the Appearance of Hollow-Core Photonic Bandgap Fiber (HC-PBF), it was Widely Concerned for its Excellent Characteristics. in Order to Study the Characteristics of the HC-PBF that can be Used in Resonator Fiber Optic Gyros (R-Fogs), the Model Structure of a Polarization-Maintaining HC-PBF was Built and its Performance was Simulated by Using the Finite Element Method (FEM). its Mode Field Distribution and Birefringence Characteristics were Obtained. the Influences of the Air Core and Cladding Structures on the Mode Field Distribution and Birefringence were Simulated and Analyzed Further. the Result Showed that there are both Core Mode and Surface Mode in the Structure we Built. by Adding Scattering Points into the Fiber Core, the Surface Mode can be Significantly Suppressed. by Matching the Size of Core and Air Holes around the Core, a Birefringence up to 8*10-4 were Obtained.

scholarly journals Hardware solutions for energy-efficient control technologies of distribution network objects based on power semiconductor devices

2021 ◽  
Vol 24 (1) ◽  
pp. 91-96
Author(s):  
V. N. Krysanov ◽  
◽  
V. L. Burkovskii ◽  
I. A. Khaychenko ◽  
◽  
...  
Keyword(s):  
Reactive Power ◽  
Short Circuit ◽  
Distribution Networks ◽  
Voltage Transformer ◽  
Industrial Facilities ◽  
Power Semiconductor ◽  
Wide Range ◽  
Electric Power Sector ◽  
Power Part ◽  
Control Technologies

The article considers topical issues in development of energysaving technologies to optimize the control of distribution networks according to the criterion of minimum power losses. The technology consists in introducing new hardware to control the modes based on static devices. Based on the analysis of the existing hardware created to control the modes of distributio networks, the developed circuitry solutions of the power part and the control system of the multifunctional thyristor voltage transformer and hybrid thyristor capacitor are proposed. Their main technical characteristics and ways to reduce voltage asymmetry, limiting short circuit currents and regulating reactive power are det ermined. The use of software and hardware solutions was recommended for a wide range of energy conservation tasks, both in the electric power sector and at the level of industrial facilities

Thermal analysis of GaN-based LEDs using the finite element method and unit temperature profile approach

2004 ◽  
Vol 241 (12) ◽  
pp. 2681-2684 ◽  
Author(s):  
Tae Hee Lee ◽  
Lan Kim ◽  
Woong Joon Hwang ◽  
C. C. Lee ◽  
Moo Whan Shin
Keyword(s):  
Finite Element Method ◽  
Thermal Analysis ◽  
Finite Element ◽  
Temperature Profile ◽  
The Finite Element Method ◽  
Profile Approach ◽  
Element Method

Non-linear thermal analysis of light concrete hollow brick walls by the finite element method and experimental validation

2006 ◽  
Vol 26 (8-9) ◽  
pp. 777-786 ◽  
Author(s):  
J.J. del Coz Díaz ◽  
P.J. García Nieto ◽  
A. Martín Rodríguez ◽  
A. Lozano Martínez-Luengas ◽  
C. Betegón Biempica
Keyword(s):  
Finite Element Method ◽  
Thermal Analysis ◽  
Finite Element ◽  
Experimental Validation ◽  
The Finite Element Method ◽  
Non Linear ◽  
Hollow Brick ◽  
Element Method

Thermal Analysis of Concrete Structures with Pipe-Cooling System by a New Algorithm

2015 ◽  
Vol 724 ◽  
pp. 161-165
Author(s):  
You Ping Zhu ◽  
Shu Rong Feng ◽  
Qing Chun Shi ◽  
Jun An Su
Keyword(s):  
Finite Element Method ◽  
Thermal Analysis ◽  
Temperature Field ◽  
Cooling System ◽  
Concrete Structures ◽  
The Finite Element Method ◽  
Good Efficiency ◽  
Pipe Model ◽  
Calculate Temperature Field ◽  
Computing Speed

In this paper, we proposed a new algorithm to calculate the temperature field of concrete structures with pipe-cooling system. As we know, the pretreatment of pipe model is hard and the calculation will be time-consuming. However, in this algorithm, the computing information of pipes will be included in the exist nodes of elements, so the workload of pretreatment would be reduced. Meanwhile, the finite element method (FEM) format and the formula of water temperature along pipe have been established in this paper. Iteration was not required in this method, so the computing speed will be improved too. An example has shown that this algorithm can response temperature gradient near the pipe and have good efficiency to calculate temperature field of concrete structures with pipe-cooling system.

scholarly journals A Comparative Thermal Analysis of Walls Composed of Traditional and Alternative Building Materials

2020 ◽  
Vol 16 (2) ◽  
pp. 388-395
Author(s):  
Rositsa Petkova-Slipets ◽  
Krastin Yordanov ◽  
Penka Zlateva
Keyword(s):  
Finite Element Method ◽  
Thermal Analysis ◽  
Building Materials ◽  
Simulation Modelling ◽  
Thermal Calculation ◽  
Thermal Processes ◽  
The Finite Element Method ◽  
Good Convergence ◽  
Specialized Software ◽  
Different Types

AbstractThis research aims at comparing the thermal performance of walls made from traditional and alternative building materials. The experimental study involves five types of walls were studied based on perforated ceramic bricks and a mixture of clay, sand with various straw proportions. Specialized software and the finite element method (FEA) were employed for modelling of the thermal processes and their visualization for the different types of walls. A simulation modelling algorithm was developed. The models developed show very good convergence of the results and provide for subsequent design and thermal calculation of constructions made by environmentally friendly materials.

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