International Journal of Energy and Environment

E-ISSN: 2308-1007
Volume 14, 2020

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of NAUN Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

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Volume 14, 2020

Title of the Paper: Clearing Break Points of Overcurrent Protection Coordination for Parallel Distribution Feeder


Authors: Mahmoud A. Elsadd, Abdel-Maksoud I. Taalab, Tamer A. Kawady, Nagy I. Elkalashy

Pages: 47-51

Abstract: This paper presents a modified overcurrent protection system to overcome the break points of a parallel distribution feeder protection. For realizing an appropriate protection setting, two concepts are introduced, and their performance is evaluated. These concepts are the adaptive coordination exploiting smart grid information and the modified coordination methods. The modified coordination is adjusted with changing of the contemporary worst fault point. A comparative study is done between the adaptive, modified, and conventional coordination concepts. For investigation purposes, a 11 kV distribution feeder is modelled using the Matlab/Simulink package. The results provide evidence of the efficacy of the proposed modified coordination concept for parallel distribution feeders

Title of the Paper: Comparison Study Between Neural STSM and ANFIS-STSM Method in DPC Control Scheme of DFIG-based Dual-rotor Wind Turbines


Authors: Benbouhenni Habib, Boudjema Zinelaabidine, Belidi Abdelkader

Pages: 33-46

Abstract: This work presents the comparison study between neural super-twisting sliding mode control (NSTSM) and adaptive-network-based fuzzy inference system-STSM (ANFIS-STSM) algorithm of the doubly fed induction generator (DFIG) controlled by direct power control (DPC). The mathematical model of the three-phase DFIG has been described. The descriptions of the DPC strategy, NSTSM and the ANFIS-STSM algorithm have been presented. The DPC strategy with NSTSM and ANFIS-STSM has been described. The simulation studies of the DPC strategy with intelligent STSM algorithms have been performed, and the results of these studies are presented and discussed.

Title of the Paper: Effect of Recycled Concrete Aggregates on Compressive Strength and Water Permeability of Concrete


Authors: Tehmina Ayub, Asad-ur-Rehman Khan, Wajeeha Mahmood

Pages: 25-32

Abstract: This paper discusses the effects of recycled concrete aggregates (RCA) on compressive strength and permeability of recycled aggregate concrete (RAC) by using recycled concrete aggregates as a replacement of natural coarse aggregates (NCA). Four replacement percentages were used to study the effect of replacement. Replacement percentages used were 30%, 50%, 70% and 100% with 0% replacement was used as control. Mix design of 1:1.24:2.6 was used in the study with water to cement ratio of 0.43. Influence of RCA on compressive strength was determined for all the mixes as per ASTM C39 standard. The permeability of all the mixes was determined by measuring absorption, sorptivity and Darcy’s coefficient. Results of compressive strength indicated that concrete with 30% replacement of NCA can be successfully used in structural concrete without compromising too much on strength. Whereas, the replacement of natural aggregates with RCA has a negative impact on the permeability of concrete at all replacement levels. Absorption, sorptivity and permeability of natural aggregate concrete is lower as compared to RAC with 30% replacement showing the better performance as compared to other replacement ratios.

Title of the Paper: The Context and Principles of Environmental Management System Implementation


Authors: Dumitrascu A.-E.

Pages: 20-24

Abstract: The purpose of this paper is to detail the aspects regarding the implementation requirements of environmental management system in accordance with SR EN ISO 14001:2015. There are defined the main indicators underlying the context and the principles of environmental management system highlighting the importance of systematic approach of environmental management. The presented study consists of environmental aspects assessment specific to the production processes. By implementing the adequate corrective actions, the score of the significant environmental aspects decrease falling within the category of insignificant environmental aspects.

Title of the Paper: Research in the Field of Polycrystalline Diamond Tools


Authors: Ioan Enescu

Pages: 14-19

Abstract: The multitude of cutting materials already in existence increased further with the appearance of polycrystalline diamond (PCD) some 25 years ago. Ceramic show no chemical affinity to most machining materials, but are very brittle. Natural diamond, the hardest known material, is very wear resistant, but also sensitive to impacts and difficult to shape. The main advantage brought about by the development of polycrystalline diamond is the partial combination of the exceptional hardness of diamond with the toughness of tungsten carbide. This paper is presenting a series of the general considerations on cutting tools which have the cutting surface made of polycrystalline diamond. There are also presented some original results concluded by the author, based on experiments made with the tools mentioned before, which have different design values.

Title of the Paper: Interdisciplinary Process in the Field of Energy and Environment


Authors: Mihaela Popescu

Pages: 9-13

Abstract: The paper presents the results of a interdisciplinary research study of terminology in the field of energy and environment. Some modalities of acquiring terminology in environment and energy field by means of lexical and semantic entities to be mastered in a communication context are presented. Within the framework of a theoretical approach on the communication process, its cultural and social implications, the study is focused on a effects of applying a modern yet traditional learning method, problem-based learning and its benefits for the way information is rigorously organized and the importance of creating maps of representations of knowledge in this precise field. The knowledge-rich contexts contained in the corpora, the semantic relations comprised in the lexical networks are also described.

Title of the Paper: Thrusters Physical Model Formalization With Regard to Situational and Identification Factors of Motion Modes


Authors: Vitalii Budashko

Pages: 5-8

Abstract: Within the framework of the research of diagnos-tics and prediction of technical state of ship power plants (SPP) of combined propulsion complexes (CPC) depend-ences of correcting factors influencing components of thrusts and moments, proportional dimensions of model and real thrusts (THRs), tied to the original geometry were obtained. This was done by formalizing the physical model of the azimuth thruster with the means of identifying the degradation effects on the flow lines of the propellers by methods of computational hydrodynamics. The technique of improving the structure of the mathematical models of the SPP CPC according to experimental studies by measur-ing the input and output parametric coordinates of the THRs CPC of a vessel operating in the dynamic positioning mode is announced.

Title of the Paper: Techno-Economic Study of Linear Fresnel Solar Thermal Power Plant in Algeria


Authors: Hani Beltagy, Sofiane Mihoub, Hamid Ajdad, Noureddine Said

Pages: 1-4

Abstract: The objective of the present work is to characterize a power plant with concentrator of Fresnel on various Algerian sites (Sahara). These sites were chosen for comparison by moving the power plant in the Algerian sites: Hassi-R’mel, Tamanrasset, Béni-Abbes, and El Oued. A technico-economic study was made to determine the various characteristics of the power plant. This study is carried out through a simulation in the hourly scale: it concerns the insolation, the system 'field', and the 'receiving' system. The results of the simulation are represented on annual average. Annual energy production and the cost per kWh are evaluated, the technico-economic results are also estimated for the same sites, and the results are compared for the purpose of site classification.