Design and Analysis of an External-Rotor Internal-Stator Doubly Fed Induction Generator for Small Wind Turbine Application by Fem
Hacene Mellah,
Kamel Eddine Hemsas
Issue:
Volume 2, Issue 1, January 2013
Pages:
1-11
Published:
10 January 2013
Abstract: In this paper, a time stepping 2D and 3D FEM is performed for modeling and analysis external rotor DFIG .The finite element method currently represents the state-of-the-art in the numerical magnetic field computation relating to electrical machines. FEM is a numerical method to solve the partial differential equations (PDE) that expresses the physical quantities of interest, in this case Maxwell’s equations. This will result in a more accurate result compared to analytical modeling, which can be regarded as a simplification of the PDE. FEM analysis is used for transient mode, magnetic field calculation, the magnetic flux density and vector potential of machine is obtained. In this model we including, non linear material characteristics, eddy current effect, torque-speed characteristics, ambient temperature effect and magnetic analysis are investigated using MAXWELL program. With this program, the components of the DFIG can be calculated with high accuracy.
Abstract: In this paper, a time stepping 2D and 3D FEM is performed for modeling and analysis external rotor DFIG .The finite element method currently represents the state-of-the-art in the numerical magnetic field computation relating to electrical machines. FEM is a numerical method to solve the partial differential equations (PDE) that expresses the physi...
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Study of Thermal Behaviour of Roofing on Subtropical Climate: the Use of Radiant Barrier
Carla Fernanda Barbosa Teixeira,
Lucila Chebel Labaki
Issue:
Volume 2, Issue 1, January 2013
Pages:
12-17
Published:
10 January 2013
Abstract: Solar radiation is the main energy source and responsible for heat gain in buildings, particularly in tropical climate regions. In general, roofing is one of the constructive components that receive most of incident solar radiation in single-storey buildings. One of the techniques to attenuate the solar heat gain is the use of radiant barrier in the roofing system. This paper presents results about thermal performance of different kinds of radiant barrier applied to tiles to verify the temperature attenuation. The study was performed in test cells, where the radiant barrier (aluminum film) was applied to a roofing system consisting of metallic tiles and PVC membrane. Results show that radiant barriers are efficient in providing a good thermal performance of roofing systems and are expected to contribute for the knowledge transfer to designers so as to provide thermal comfort and energy saving in buildings.
Abstract: Solar radiation is the main energy source and responsible for heat gain in buildings, particularly in tropical climate regions. In general, roofing is one of the constructive components that receive most of incident solar radiation in single-storey buildings. One of the techniques to attenuate the solar heat gain is the use of radiant barrier in th...
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Dynamic Performance Evaluation of Single Bed Desiccant Dehumidification System
Y. A. F. El-Samadony,
A. M. Hamed,
A. E. Kabeel
Issue:
Volume 2, Issue 1, January 2013
Pages:
18-25
Published:
10 January 2013
Abstract: In the present work, experimental investigation on the dynamic performance of sealed and less maintenance vertical packed porous bed desiccant dehumidification system has been carried out. The desiccant bed operates as an adsorber and then operates as a regenerator intermittently. In the experimental part of this investigation, silica gel is applied as the desiccant material. Hot air from an air heater is blown through the bed using an air blower in the regeneration process. System performance at different conditions of flowing air is demonstrated. The experimental tests were carried out at different conditions of inlet air and initial bed parameters. Temperature and humidity of air at inlet and exit of the bed were measured. The obtained results show that air with inlet humidity ranging from 5.067 to 10.04 g/kg could be dehumidified, using silica gel, to a lower level of humidity (0.7754 g/kg). The relation between the studied parameters on the adsorption processes is correlated. Results show that the ''Rehabilitation period" in adsorption process could be eliminated if air mass flow rate is greater than 1.92 kg/hr per kg of silica gel.
Abstract: In the present work, experimental investigation on the dynamic performance of sealed and less maintenance vertical packed porous bed desiccant dehumidification system has been carried out. The desiccant bed operates as an adsorber and then operates as a regenerator intermittently. In the experimental part of this investigation, silica gel is applie...
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