Arak Bunmat

Electromagnetic Field of 25 kV Overhead Contact System for Electrified Train Analysis Using 3D-FEM

Simulation of Temperature in an Electric Vehicle Cabin Using the 3D Finite Element Method

This study proposes a novel redesign of a solar water heater prototype by integrating a stationary compound parabolic concentrator (CPC) internally within a standard collector housing. Unlike conventional flat-plate systems or external trough collectors, this design aims to enhance thermal efficiency while maintaining a compact footprint suitable for residential retrofitting in tropical climates. The system’s thermal performance was analyzed using a 3D finite element method (FEM) based on the convection-diffusion equation, with a specific focus on a 2 cm focal length configuration designed to fit spatial constraints. The simulation results indicated a maximum water temperature of 62.9 °C under concentrated solar flux, while the experimental prototype achieved a maximum temperature of 55.0 °C under corresponding field conditions. The comparative analysis reveals a temperature discrepancy of approximately 8 °C (12.5%), which is attributed to the simplified boundary conditions neglecting radiative losses in the model. Despite this deviation, the proposed parabolic design demonstrated a distinct thermal enhancement compared to the conventional baseline. These findings validate the technical feasibility of the compact internal concentrator, offering a low-cost, high-performance alternative for domestic water heating applications.

This research focuses on developing a mathematical model to analyze the temperature distribution within a microwave oven system using a TE₂₀ waveguide and the 3D Finite Element Method. The study examines the operation of a stationary tray microwave oven with one-way and three-way waveguide configurations to compare the temperature distribution in food and assess the impact of the waveguide pattern on the steady-state temperature. Simulations were conducted at a frequency of 20,000 MHz and a power of 800 W using MATLAB software, with results presented in graphical form. The findings reveal that the three-way waveguide achieves a more uniform and faster temperature distribution compared to the one-way waveguide, demonstrating reduced temperature deviation, higher peak food temperatures, and shorter times to reach steady state. These results support the development of more efficient microwave oven designs, enhancing heat distribution and energy savings, with potential applications in the food industry and modern kitchen appliances.

This paper present a study on the electromagnetic field of a power transmission line used for solar EV charging through the 3D Finite Element Method (FEM) by varying the conductor material type. The study is divided into four parts: beginning with the design of the study area's elements, followed by the exploration of approximation functions within 3D elements, the creation of element equations, and finally, the simulation of electromagnetic field distribution. The approach involves dividing the study area using tetrahedral elements (it is a shape with the least number of nodes and connections), applying equations derived from element-based approximations, and solving them in MATLAB. The study's results indicate that the conductor type affects the electromagnetic field values (favored by transmission line), with the minimum fields at a 1-meter distance from the source being 1.2357 µT for copper (Cu) and 1.2339 µT for aluminum (Al). Both conductor types exhibit electromagnetic field values at a 1meter distance from the source (throughout the day) that do not exceed the ICNIRP standard.

Simulation of Electromagnetic Field of Electrical Conductor Materials in Wireless Charging Device Using 3D Finite Element Method

The characterization of magnetic field intensity generated by underground cables, along with detailed modeling to unveil its true nature, remains a significant challenge. To address this, our paper proposes a mathematical model for diagnosing the magnetic field intensity of 22 kV and 115 kV underground power lines using the 3D finite element method to simulate the magnetic field. Considering both 22 kV and 115 kV underground cables, the 3D model, employing the proposed finite element method, is based on the linear partial differential equation method, incorporating weighted residuals and the Galerkin method. These cables will be arranged in different configurations, and the experimental results will be compared with magnetic field values to understand their mutual effects. Additionally, a comparative analysis will assess the impact of magnetic field values on humans and electrical equipment, comparing them against the ICNIRP standard. The study involves an examination of the magnetic fields of several underground transmission lines using the 3D finite element method. Simulation results demonstrate that the proposed method can graphically depict the 3D distribution of the electromagnetic field around 22 kV and 115 kV underground cables with detailed characteristics. Furthermore, the proposed model is employed to determine the magnetic field distribution at various underground depths. Thus, the proposed method proves capable of revealing the true nature of underground cables and assessing cable arrangements at different depths.

This paper, a magnetic field mathematical model is presented in a multiphase generator designed with two different stator winding configurations: 3 -phase and 6 -phase, both designs have same specifications in other aspects, including a 6-pole rotor, 36 slots, and double-layer winding. The aim is to analyze and compare the distribution of magnetic field, electric power, and electric current generated by both designs under ideal conditions, using the 3D finite element method. The results of the simulation could be explained that increasing the number of stator winding sets in the generator could increase the radial magnetic field, and tangential magnetic field, also increase the electrical power output of the generator.