Volume-9 , Issue-3 , Sep 2022, ISSN 2348-635X Go Back

• Open Access   Article

  Study of Current Variators Applied to Braking Energy`s Recovery From a Vehicle

  F. Philibert Andriniriniaimalaza, Geoslin Rakotovelo, Djaffard Maxwell, Charles B. Andrianirina

  Research Paper | Journal-Paper (WAJES)

  Vol.9 , Issue.3 , pp.1-6, Sep-2022

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  Abstract
  In electrical energy production systems, energy flows make use of various energy conversions which are, for the most part, essential. DC-DC conversion is one of them. Often, choppers, like step-down (Buck), step-up (Boost) or step-down-boost (Buck-Boost), ensure this conversion. In this work, the use of current variators, boost converter, is considered. These are power electronics converters, often used by various fields, including the field of transport. With the appearance of electric vehicles, they see themselves as being among the elements that will ensure the best energy exchange of the whole. And above all, its involvement in the regenerative braking of said vehicle is highlighted. Starting from the concept of recovery of braking energy, we will relay the type of converter used, often reversible in current. And without going into detail, the block diagram of the electric vehicle studied, equipped with the electronic differential is illustrated. The results obtained during the simulation using Matlab/Simulink clearly demonstrate the feasibility of recovering braking energy.

  Key-Words / Index Term
  Current variator, Boost, Regenerative braking, Energy management, Vehicle

  References
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  [7] Katalevsky D. Yu, Gareev T. R, “Development of electric road transport: simulation modelling”. DOI : 10.5922/2079-8555-2020-2-8, Pp. 118-139
  [8] F. Philibert Andriniriniaimalaza, Endson Zozime Randrianarinirina, Jean Nirinarison Razafinjaka and Charles Bernard Andrianirina, 2022, “Efficiency Optimization Approaches for Hybrid Electric Vehicles”, International Journal Of Engineering Research & Technology (IJERT), Vol. 11, No. 05, Pp. , 2022.
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  Citation
  F. Philibert Andriniriniaimalaza, Geoslin Rakotovelo, Djaffard Maxwell, Charles B. Andrianirina, "Study of Current Variators Applied to Braking Energy`s Recovery From a Vehicle," World Academics Journal of Engineering Sciences, Vol.9, Issue.3, pp.1-6, 2022

• Open Access   Article

  Production and Characterization of Rice Husk Ash-Based Thermal Insulators for Heat Energy Saving Applications

  Oko OE, Mbakaan C.

  Research Paper | Journal-Paper (WAJES)

  Vol.9 , Issue.3 , pp.7-14, Sep-2022

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  Insulating refractories are usually produced and used for different applications to reduce energy losses and save energy. In this research, thermal insulators are made using the nanosilica-based ash generated from chemically treated rice husks. Typically, the rice husks were sieved and washed with deionized water. The husks were boiled in hydrochloric acid (HCl) and then soaked in Phosphoric acid (H3PO4) to further remove mineral impurities. The thermal insulators were formed by the pressing method and were fired at temperatures between 1000-1400 oC. The generated ash contains high silica content. The low thermal conductivity and enhanced mechanical and physical properties of the thermal insulators indicate that the insulators are suitable for heat energy-saving applications especially, in furnaces and other similar devices.

  Key-Words / Index Term
  Thermal Insulator, Rice Husk Ash, thermal conductivity, Porosity, Pressing method

  References
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  Citation
  Oko OE, Mbakaan C., "Production and Characterization of Rice Husk Ash-Based Thermal Insulators for Heat Energy Saving Applications," World Academics Journal of Engineering Sciences, Vol.9, Issue.3, pp.7-14, 2022

• Open Access   Article

  Quick Spot-welding In Thin Aluminum Sheets using Induction Heating

  Rimpal Jain, C.M. Ramesha

  Research Paper | Journal-Paper (WAJES)

  Vol.9 , Issue.3 , pp.15-20, Sep-2022

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  Spot welding is a widely popular welding technique with immense applications in the automotive industry. Currently, spot welding is carried out using resistance welding. In the present study, a new approach proposes the use of induction heating to achieve strong and quick spot welds in aluminium specimens due to its excessive use in the automotive industry and body in white to improve vehicle performance and fuel economy. The procedure is accomplished through the heat and hit methodology in the form of a portable stapling device. Varying loads and current settings determine the strength of the weld. This paper also shows the critical assessment of thermal losses and the new developments in heat insulation of mild steel pallets which are used to stamp the aluminium sheets in order to carry out the spot welding.

  Key-Words / Index Term
  Induction Heating, Spot Welding, Aluminium Sheets, Hot Stamping

  References
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  Citation
  Rimpal Jain, C.M. Ramesha, "Quick Spot-welding In Thin Aluminum Sheets using Induction Heating," World Academics Journal of Engineering Sciences, Vol.9, Issue.3, pp.15-20, 2022

• Open Access   Article

  Water Treatment Operations: Case Study of Mada Water Works

  Abdulhalim Musa Abubakar, Yahuza Adamu Mazawaje, Muraina Basiru Olayinka, Ehime Irene Itamah, Okoh Chibuike Francis, Usman Yakubu Bukar

  Research Paper | Journal-Paper (WAJES)

  Vol.9 , Issue.3 , pp.21-37, Sep-2022

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  Abstract
  Design and working principles of water treatment plants in other parts of the world, as well as in Nigeria are different and requires extensive study. This work looks at current trends undergone in water treatment plants in contrast with the one obtainable at Mada Water Works (MWW) in North Central, Nigeria. Because, majority of these plants including the MWW apply obsolete techniques and equipment, as they were built in the early 1980s and 1990s. Previous research only looks at metallic contamination levels of the Mada River which serve MWW with unclean raw water. Hence, this work entails an in-depth study of the plant’s modus operandi, challenges faced and ways of solving them. Studies shows that the entire treatment plant needs a complete turnaround to prevent it from eminent system collapse. The attention of researchers is therefore drawn to the treatment plant’s various unit operation in order to address challenges facing their functionality.

  Key-Words / Index Term
  Mada River, Water treatment, Surface water, Scraper bridges, Nasarawa

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  Citation
  Abdulhalim Musa Abubakar, Yahuza Adamu Mazawaje, Muraina Basiru Olayinka, Ehime Irene Itamah, Okoh Chibuike Francis, Usman Yakubu Bukar, "Water Treatment Operations: Case Study of Mada Water Works," World Academics Journal of Engineering Sciences, Vol.9, Issue.3, pp.21-37, 2022