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Thangavel S.,KS Rangasamy College of Technology
International Journal of Electrical Power and Energy Systems | Year: 2012

In this paper, a photovoltaic (PV) based dynamic voltage restorer (DVR) is proposed to handle deep voltage sags, swells and outages on a low voltage residential distribution system. The PV based DVR can recover sags up to 10%, swells up to 190% of its nominal value. Otherwise, it will operate as an Uninterruptable Power Supply (UPS) when the utility grid fails to supply. It is also designed to reduce the usage of utility grid, which is generated from nuclear and thermal power stations. PV based DVR system is comprised of PV system with low and high power DC-DC boost converter, PWM voltage source inverter, series injection transformer and semiconductor switches. Simulation results proved the capability of the proposed DVR in mitigating the voltage sag, swell and outage in a low voltage distribution system. © 2011 Elsevier Ltd. All rights reserved.

Nagarani N.,KS Rangasamy College of Technology | Mayilsamy K.,Indian Institute of Road and Transport Technology | Murugesan A.,KS Rangasamy College of Technology
Renewable and Sustainable Energy Reviews | Year: 2014

This review presents when and how extended surface with heat exchanger have been used over the last 15 years in the field of heat transfer. They have been used in this field over a century, but their utilization increases more recent. For past 1 decade, most of the industries required high performance heat transfer components with less weight, volume and cost. The reported investigations are categorized into five major groups as follows: annular fins, elliptical fins and elliptical tube, pin fins, longitudinal fins and recent trend fins by experimental, numerical and analytical methods. Around 70 published articles related to fins with heat exchanger are briefly reviewed. This information is useful for future use of the different shapes of extended surface based on the space availability and cost. © 2013 Elsevier Ltd. All rights reserved.

Anojkumar L.,KS Rangasamy College of Technology | Ilangkumaran M.,KS Rangasamy College of Technology
Expert Systems with Applications | Year: 2014

The material plays an important role in an engineering design process. The suitable material selection for a particular product is one of the vital tasks for the designers. In order to fulfil the product's end requirements, designers need to analyze the performance of various materials and spot suitable materials with precise functionalities. Due to the presence of large number of materials with diverse properties, the material selection process is complicated and time consuming task. There is a necessity of systematic and efficient approach towards material selection to choose best alternative material for a product. The aim of this paper is to describe the application of four Multi Criteria Decision Making methods for solving pipes material selection problem in sugar industry. FAHP-TOPSIS, FAHP-VIKOR, FAHP-ELECTRE, FAHP-PROMTHEE are the four methods used to choose the best alternative among the various materials. The ranking performance of various MCDM methods is also compared with each other and exploring the effectiveness and flexibility of VIKOR method. Five stainless steel grades such as J4, JSLAUS, J204Cu, 409 M, 304 and seven evaluation criteria such as yield strength, ultimate tensile strength, percentage of elongation, hardness, cost, corrosion rate and wear rate are focussed in this study to choose the suitable material. © 2013 Published by Elsevier Ltd. All rights reserved.

Thangavel S.,KS Rangasamy College of Technology
International Journal of Electrical Power and Energy Systems | Year: 2013

In this paper, a novel photovoltaic fed Dynamic Voltage Restorer (PV-DVR) is proposed to mitigate deep voltage sags, voltage swells and outages on a low voltage residential distribution system during both daytime and night time. In addition to the voltage regulation, the proposed PV-DVR reduces the energy consumption from the utility grid by disconnecting the utility grid from the load through the semiconductor switches, when the PV system generates excessive or equal power to the required load demand during the day time. However, the reduction of energy consumption is always desirable for the reduction of panel tariff and global warming gasses. Further, the use of low step-up DC-DC converter with fuzzy based Perturb & Observe (P&O) Maximum Power Point Tracking (MPPT) algorithm eliminates the drawback of conventional PV based DVR by tracking maximum power point of the PV array. Simulation and experimental results are presented to validate the advantage of the proposed system. © 2013 Elsevier Ltd. All rights reserved.

Padmanabhan V.M.V.,KS Rangasamy College of Technology | Palanisamy S.,KS Rangasamy College of Technology
Energy Conversion and Management | Year: 2012

The ir-reversibility at the process of a vapour-compression refrigeration system (VCRS) with nanoparticles in the working fluid was investigated experimentally. Mineral oil (MO) with 0.1 g L -1 TiO 2 nanoparticles mixture were used as the lubricant instead of Polyol-ester (POE) oil in the R134a, R436A (R290/R600a-56/44-wt.%) and R436B (R290/R600a-52/48-wt. %)VCRSs. The VCRS ir-reversibility at the process with the nanoparticles was investigated using second law of thermodynamics. The results indicate that R134a, R436A and R436B and MO with TiO 2 nanoparticles work normally and safely in the VCRS. The VCRSs total ir-reversibility (529, 588 and 570 W) at different process was better than the R134a, R436A and R436B and POE oil system (777, 697 and 683 W). The same tests with Al 2O 3 nanoparticles showed that the different nanoparticles properties have little effect on the VCRS ir-reversibility. Thus, TiO 2 nanoparticles can be used in VCRS with reciprocating compressor to considerably reduce ir-reversibility at the process. © 2012 Elsevier Ltd. All rights reserved.

Gopalakrishnan S.,KS Rangasamy College of Technology | Murugan N.,Coimbatore Institute of Technology
Materials and Design | Year: 2011

The usage of particulate reinforced metal matrix composite (MMC) is steadily increasing due to its properties such as high specific strength, high specific modulus and good wear resistance. Aluminium matrix composite (AMC) plays an important role to meet the above requirements. Effective utilization of AMC is based on not only its production but also on fabrication methods. Among AMCs, those based on particulate reinforcements are particularly attractive, due to their lower production costs. Aluminium matrix titanium carbide reinforced composite (Al-TiCp) was produced in an inert atmosphere by indigenously developed Modified Stir Casting Process with bottom pouring arrangement (3-7% TiC by weight). Friction stir welding process (FSW) is employed to make weld joints. The welding parameters such as axial force, welding speed, tool rotational speed, percentage TiC addition etc., and profile of the tool were considered for analysis. In this study, an attempt is made to predict ultimate tensile strength (UTS) of the welded joints using a mathematical model. The FSW specimens without any post-weld heat treatment belonging to a different set of parameters tested, exhibited a high joint efficiency (most of them ranging from 90% to 98%) with respect to the ultimate tensile strength of the base material AA6061. It was found from the analysis of the model that the tool pin profile and the welding speed have more significant effect on tensile strength. © 2010 Elsevier Ltd.

Venkatesan T.,KS Rangasamy College of Technology | Sanavullah M.Y.,Salem College
International Journal of Electrical Power and Energy Systems | Year: 2013

In this paper, the Shuffled Frog Leaping Algorithm is proposed to solve the Profit Based Unit Commitment problem under deregulated environment with emission limitation. The bi-objective function optimization problem is formulated as a maximization of the Generation Companies profit and a minimization of the emission output of the thermal units, while all of the constrains should be satisfied. This work, considers the new softer demand constraint to allocate fixed and transitional cost to the scheduled hours. The IEEE 10 unit 39 bus test system with 24 h data is taken as the input for simulation using MATLAB 7.10 version. From the results obtained, it is observed the proposed algorithm achieves maximum profit and minimum emission level with less computational time compared to traditional unit commitment. © 2012 Elsevier Ltd. All rights reserved.

Gopalakrishnan S.,KS Rangasamy College of Technology | Murugan N.,Coimbatore Institute of Technology
Composites Part B: Engineering | Year: 2012

Metal matrix composite (MMC) focuses primarily on improved specific strength, high temperature and wear resistance application. Aluminium matrix reinforced with titanium carbide (Al-TiC p) has good potential. The main challenge is to produce this composite in a cost effective way to meet the above requirements. In this study Al-TiC p castings with different volume fraction of TiC were produced in an argon atmosphere by an enhanced stir casting method. Specific strength of the composite has increased with higher % of TiC addition. Dry sliding wear behaviour of AMC was analysed with the help of a pin on disc wear and friction monitor. The present analyses reveal the improved specific strength as well as wear resistance. © 2011 Elsevier Ltd. All rights reserved.

Avinash A.,Sri Venkateswara College of Engineering | Subramaniam D.,KS Rangasamy College of Technology | Murugesan A.,KS Rangasamy College of Technology
Renewable and Sustainable Energy Reviews | Year: 2014

Recent days, underground carbon resources are dwindling at a faster rate. This triggered primary interest in development of bio-fuel as substitute to Petroleum-based fuel for alleviating world energy and economic crisis. This review explores the environmental impacts of bio-fuels on the road transportation and a large-scale impact of bio-fuel crops on food-based agricultural lands, which are now more gainfully used for churning out vehicle fuel. A global bio-diesel production is depicted with an appropriate data from 1991 to 2012. Also this article explains in detail the bio-diesel status (which includes crop type, climatic conditions, yield, oil concentration, land use/availability, and policy impacts) of 27 different countries across the world. In addition, this article extends to classify the potential bio-fuel feedstocks obtainable in each country. © 2013 Elsevier Ltd.

Lakshmi K.,KS Rangasamy College of Technology | Vasantharathna S.,Coimbatore Institute of Technology
International Journal of Electrical Power and Energy Systems | Year: 2014

This paper presents an Artificial Immune System approach for solving generation scheduling problem of a Genco comprised of thermal and wind energy systems. Wind-thermal scheduling problem determine the time of instant to start up and shut down the generating units over a scheduled time period, while satisfying the 'system' and 'generator' constraints including minimum up/down time; ramp rate limits of thermal units and wind power constraints. In this work, the impact of wind energy on short term generation scheduling problem is analyzed through the adaptive search which is inspired from the Artificial Immune System. The effectiveness of the proposed approach is demonstrated through a Genco consists of 10 thermal units with 2 wind farms and the results for the near optimal schedule are discussed. © 2013 Elsevier Ltd. All rights reserved.

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