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Volume 6 Issue 10 (October 2019)

S.No. Title & Authors Page No View
1

Title : Heat Transfer Enhancement: A Review of Ongoing Issues

Authors : Ranjan Kumar, Shreya Agarwal

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Abstract :

In this paper, we discuss about various methods adopted by researchers around the world for heat transfer enhancement. Three major categories of heat transfer enhancement techniques viz. annihilation of thermal boundary layer, employment of magnetohydrodynamics flow and enhancement of critical heat flux during boiling are studied in brief. We also present about the advantages as well as drawbacks of each one of them. There are various field of application in the real world where these methods can be utilized, but each has its own limitations which we discuss in the current work. Through this work we put forward a well comprehension of the ongoing issues in heat transfer, thermal management and energy savings which are always the centre of attraction for the researchers from wide-ranging field in engineering.

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2

Title : Optimization of Harmonic Identification Methods in the Kinshasa Distribution Power Grid

Authors : Mathangila Kimeya, Lidinga Mobonda Flory, Okemba Rodrgue Armel Patrick, Nsongo Timothee, Bandekela Kazadi Andre, Omboua Alphonse

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In this paper, we present various mathematical methods for the identification of harmonic in the electrical energy distribution network. The developed equations addressed the harmonic problem in the distribution transformer.

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3

Title : Impact of Distributed Generation in Distribution Network Losses and Voltage Profile

Authors : Prahlad Pokharel, Prof. Dr. Laxman Poudel

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This paper presents the impacts of installing DG on a distribution circuit. The work is focused on analyzing the impact of DG installation on distribution network operation including voltage analysis and electric losses of the system. Different DG penetration levels, locations and the impacts of installing one large-scale DG on the main distribution line and distributing it several locations on voltage profile and losses are explored. IEEE 34 node test feeder and Nagarkot feeder of Bhaktapur distribution system was built using its one-line diagram in DIgSILENT PowerFactory 2017 to perform detailed analysis. The research involves several case studies that explore the impacts of installing distributed generation (DG) on a distribution network operation including the voltage profile and losses of the system. Wind Turbine Generators are introduced as Distributed Generators (DGs) at various nodes and the impacts that DG produces on power losses and voltage profile is studied. Simulated results obtained using load flow are presented and discussed.

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4

Title : Determination of Photovoltaics Hosting Capacity of 33kV Network in Province No. 1, Nepal

Authors : Ashish Nepal, Nawraj Bhattarai

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Abstract :

The unpredictable nature of output of alternative energy sources like Solar PV often become troublesome for the smooth operation of electrical energy transmission/distribution system. Hence, before interconnecting such sources to the transmission/distribution network, it is necessary to assess if the variation power quality parameters of the hosting system (Hosting Capacity) lies within the standard criterion. This study identifies the hosting capacity of Photo-Voltaic systems in a 33 kV network of Integrated Nepal Power System in Province No. 1, Nepal. Time domain load flow has been carried out to study the system margins to accommodate given size of photo voltaic system. Load flow simulation are also carried out for both Wet and Dry season indicating times with excess and scarce generation in the system. The size of the generating units fed to two different buses are gradually increased and the hosting capacity has been analysed. It is seen that, with existing infrastructures, installation of generating units up to 30 MWp is suitable.

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5

Title : Composes carbonyles majeurs et indices physico-chimiques des huiles essentielles de deux especes du genre Cymbopogon (Poaceae) du Congo-Brazzaville

Authors : Belline Ndzeli Likibi, Gouollaly Tsiba, Aime Bertrand Madiele Mabika, Arnaud Wilfrid Etou Ossibi, Samuel Nsikabaka, Jean-Maurille Ouamba

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The hydrodistillation of the dry leaves of Cymbopogon citratus (DC) Stapf and Cymbopogon nardus (L.) Rendle harvested in the southern part of Brazzaville (Makelékelé) yields yellow essential oils with respective yields of 1,54% and 2.34%. These were subjected to physico-chemical analyzes and then characterized by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The physical and chemical properties evaluated were the refractive index and the acid number, the respective values of which are (1.4887 and 0.224) for the essential oil of Cymbopogon citratus and (1.4742 and 0.280) for the essential oil of Cymbopogon nardus chromatographic and spectrometric analyzes revealed that the essential oil of Cymbopogon citratus is predominantly monoterpene (95.87%) with a preponderance of oxygenated monoterpenes occupying a high level of (90.24%). The hydrocarbon monoterpenes represent (5.63%), the hydrocarbon sesquiterpenes occupy a very small proportion of (0.07%). The essential oil of Cymbopogon nardus is rich in monoterpenes (77.85%) with a predominance of oxygenated monoterpenes (75.89%). The hydrocarbon monoterpenes are very low (1.96%). Oxygenated sesquiterpenes constitute (12.39%), while hydrocarbon sesquiterpenes are poorly represented (3.46%). Geranial (51.99%) and nereral (32.94%) two geometric isomers, carbonyl compounds forming citral are the major components of the essential oil of Cymbopogon citratus while citronellal (32.53 %) is the major carbonyl compound of the essential oil of Cymbopogon nardus, followed by geraniol (26.84%) and citronellol (10.98%). Thanks to the low refractive index, presence and important proportions of geranial (51.99%), neral (32.94%) and citronellal (32.53%), these essential oils could constitute a reservoir of exploitation carbonyl compounds required for the agri-food, cosmetic, pharmaceutical, and chemical and perfume industries.

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6

Title : Effects of openings on the seismic behavior and performance level of concrete shear walls

Authors : Hossein Alimohammadi, Mostafa Dalvi Esfahani, Mohammadali Lotfollahi Yaghin

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In this study, the seismic behaviour of the concrete shear wall considering the opening with different shapes and constant cross-section has been studied, and for this purpose, several shear walls are placed under the increasingly non-linear static analysis (Pushover).  These case studies modelled in 3D Abaqus Software, and the results of the ductility coefficient, hardness, energy absorption, added resistance, the final shape, and the final resistance are compared to shear walls without opening.

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7

Title : Development of materials for environmental pollution control from cocoa pod shells

Authors : David Leonce KOUADIO, Adjoavi Colette DJASSOU, Akissi Lydie Chantal KOFFI, Karim Sory TRAORE

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To eliminate pollutants efficiently and at a lower cost, research is focused on the use of agricultural waste as a pollution control material. This work involves the analysis of the physical and chemical parameters of raw carbon from cocoa pod shells. The cocoa shells were crushed using Retsch SK100 brand shredders and sieved from Retsch type sieves to retain only particles with diameters between 0.5mm and 1mm. Pyrolysis was carried out at 400°, 450°, 500° and 550°C in a Nabatherm 30-3300°C muffle furnace. Analysis of the results indicates pyrolysis yields of less than 50% and ash rates varying from 15% to 17.2%. The porosity study showed that carbons developed a heterogeneous porosity with maximum iodine and methylene blue index values equal to 659mg/g and 104.56mg/g respectively and a specific area varying from 427.75m²/g to 588.25m²/g. These physical characteristics allowed to determine the best raw carbons. The modeling of the basic and acid dye adsorption kinetics follows the intra-particle diffusion model. The equilibrium time obtained is 60min.

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8

Title : Gamma Irradiation Effect on Nonlinear characterization of Congo film for application in optical limiting

Authors : Hussain Ali Badran, Mustefa M. Jafer

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The influence of gamma irradiation on the nonlinear optical properties of Congo dye films prepared by casting method has been reported. The single beam Z-scan technique was used to determine the nonlinear optical properties of the Congo dye doped polymer film. The experiments were performed using cw SDL laser with a wavelength of 532 nm. This material exhibits a negative optical nonlinearity. Optical limiting characteristics of the polymer film were studied. The result reveals that Congo dye doped polymer film can be a promising material for optical limiting applications.

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9

Title : Computing the Subgroup Commutativity Degree, Normality Degrees and Cyclicity Degrees of Dicyclic Group T4n

Authors : Hayder Shelash, Ahmed M. AL-obaidi, Muayad G. Mohsin

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Abstract :

In this paper we want computed and study subgroup commutative degree, normality degree and cyclicity degree of Dicyclic group. 

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