TamilNadu, India
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Rengarajan N.,Nandha Engineering College
Journal of Energy Resources Technology, Transactions of the ASME | Year: 2017

Distributed energy systems are gaining widespread popularity in recent times as they are capable of generating power with a minimum running cost. They are also highly effective since they are located close to the load which reduces the transmission losses to a significant extent. Energy starved countries have opened up business opportunities to industries which can generate electricity and export them to the grid. The purpose of this paper is to evaluate the economic feasibility of using a compressed air energy storage (CAES) system for distributed generation sources or captive power plants when it operates in islanded mode. This paper presents the application of CAES system as a viable energy storage method to be used as a dump load when the source operates in islanded mode. Based on the data of a sample case, cost analysis is being carried out to ensure the economic feasibility of implementing such a system for a captive power plant. The detailed cost analysis for implementing such a system is presented together with a simple methodology to be followed for selecting a compressor. Implementing an energy storage system always improves the performance of the system as it is capable of smoothing out the fluctuations. For plants which are exporting power to the grid, it also improves the operating profit of the plant by acting as a buffer in situations when there are minor disturbances in the grid and the plant is forced to operate in islanded mode. The sample case study is being done for the possible application and implementation of the suggested energy storage system, and the findings show that even though the initial cost of such a system is on the higher side, it can be helpful in the long run. The proposed system will be helpful to supply peak loads and also increases the profit of such sources who export power to the grid. The proposed system is applicable only to sources which are connected to the grid and it works well only when there is a sustained period of operation in islanded mode. © 2017 by ASME.

Kavitha S.,Nandha Engineering College | Duraiswamy K.,KS Rangasamy College of Technology
European Journal of Scientific Research | Year: 2011

Diabetic retinopathy is considered as the root cause of vision loss for diabetic patients. However, if the symptoms are identified earlier and a proper treatment is provided through regular screenings, blindness can be avoided. In order to lessen the cost of these screenings, modern image processing techniques are used to voluntarily detect the existence of abnormalities in the retinal images acquired during the screenings. Exudates are a major indicator of diabetic retinopathy that can possibly be quantified automatically. This paper focuses on automatic detection of diabetic retinopathy exudates in color fundus retinal images. A series of experiments on classification of hard and soft exudates is performed with the use of image processing techniques. Initially the color fundus retinal images are subjected to preprocessing for CIELab color space conversion and Fundus region detection using binarization and mathematical morphology respectively. Subsequently nonlinear diffusion segmentation is employed to encapsulate the variation in exudates and lesion boundary criteria pixels. To prevent the optic disc from interfering with exudates detection, the optic disc is detected and localized with the aid of region props and color histogram. Exudates are detected with the aid of thresholding color histogram, which is used to classify the hard and soft exudates pixel from the color fundus retinal image. Experimental evaluation on the publicly available dataset DIARETDB1 demonstrates the improved performance of the proposed method for automatic detection of Exudates. These automatically detected exudates are validated by comparing with expert ophthalmologists' hand-drawn ground-truths. Sensitivity, Specificity and Accuracy are used to evaluate overall performance. The overall sensitivity, specificity and accuracy of the proposed method are 89.78%, 99.12% and 99.07%, respectively.

Gnanasaravanan S.,Nandha Engineering College | Rajkumar P.,SRM University
Infrared Physics and Technology | Year: 2013

The present study investigates the characterization of minerals in the River Sand (R-Sand) and the Manufactured sand (M-Sand) through FTIR spectroscopic studies. The R-Sand is collected from seven different locations in Cauvery River and M-Sand is collected from eight different manufactures around the Cauvery River belt in Salem, Erode, Tirupur and Namakkal districts of Tamilnadu, India. To extend the effectiveness of the analysis, the samples were subjected to grain size separation to classify the bulk samples into different grain sizes. All the samples were analyzed using FTIR spectrometer. The number of minerals identified with the help of FTIR spectra in overall (bulk) samples of R-Sand is 14 and of M-Sand is 13. The number has been increased while going for grain size separation, i.e., from 14 to 31 for R-Sand and from 13 to 20 for M-Sand. Among all minerals, quartz plays a major role. The relative distribution and the crystallinity nature of quartz have been discussed based on the extinction co-efficient and the crystallinity index values computed. There is no major variation found in M-Sand while going for grain size separation. © 2013 Elsevier B.V. All rights reserved.

Sivakumar V.,Nandha Engineering College | Sivasankaran S.,Sungkyunkwan University | Prakash P.,Periyar University | Lee J.,Yonsei University
Computers and Mathematics with Applications | Year: 2010

A numerical study is performed to analyze the mixed convection heat transfer and fluid flow in lid-driven cavities with different lengths of the heating portion and different locations of it. The left wall has been heated fully or partially to a higher temperature, whereas the right wall is maintained at a lower temperature. Three different lengths of the heating portion and three different locations of it are used along the hot wall. The remaining portions of the left wall, and the top and the bottom walls of the cavity are insulated. The finite volume method is used to discretize the governing equations which are then solved iteratively. The velocities and pressure are coupled by the SIMPLE algorithm. Results are presented graphically in the form of streamlines, isotherms and velocity profiles. It is concluded that the heat transfer rate is enhanced on reducing the heating portion and when the portion is at middle or top of the hot wall of the cavity. © 2010 Elsevier Ltd. All rights reserved.

Sivasankaran S.,Sungkyunkwan University | Sivakumar V.,Nandha Engineering College | Prakash P.,Periyar University
International Journal of Heat and Mass Transfer | Year: 2010

A numerical study has been performed on mixed convection in a lid-driven cavity. The vertical sidewalls of the cavity are maintained with sinusoidal temperature distribution. A finite volume method is used to solve numerically the non-dimensional governing equations. Results are analyzed over a range of the Richardson numbers, amplitude ratios and phase deviations. The results show that heat transfer rate is increased on increasing amplitude ratio. It is observed that average Nusselt numbers are increased first and then decreased when increasing the phase deviation from 0 to π. The non-uniform heating on both walls provides higher heat transfer rate than non-uniform heating of one wall. © 2010 Elsevier Ltd.

Kandasamy R.,Nandha Engineering College | Kandasamy R.,Jaya Engineering College
International Journal on Communications Antenna and Propagation | Year: 2014

Wireless Sensor Network (WSN) is a distributed, dynamic and self-organized sensor network which consists of numbers of sensor nodes. Energy required for those nodes operations, including transfer and reception of data between nodes and base station is provided by a small battery inside the node which is non-replaceable one. Lifetime of node decides lifetime of overall Sensor network. In large network there is a chance for formation of hidden zone, also known as Far-Zone. It is formed within the cluster based on Minimum Reachability Power (MRP) of the nodes. In Far-Zone LEACH, Far-Zones are managed after the formation. It does not prevent the formation of Far-Zone. Proposed new energy efficient clustering protocol, Enhanced Energy Efficient method, prevents the formation Far-Zone by using Sleep Scheduling algorithm and new Clustering method. The proposed protocol performs 15-20% better than the existing Fair-Zone protocols in terms of energy usage and network life time of WSN. © 2014 Praise Worthy Prize S.r.l. - All rights reserved.

Krishnagandhi P.,Nandha Engineering College
2014 IEEE 8th International Conference on Intelligent Systems and Control: Green Challenges and Smart Solutions, ISCO 2014 - Proceedings | Year: 2014

To maintain synchronism with grid in power system for quality power delivered to consumer purpose. Due to this stability problem arises which affects the power flow and transmission efficiency on the transmission line. A rapid growth of power electronics area which introduces the FACTS devices that is able to solve the instabilities problem easily. The Unified Power Flow Controller (UPFC) is a latest generation of FACTS device which can control the parameters of line impedance, terminal voltages, voltage angles and then damping of electromechanical oscillations between interconnected systems for secure operation and also improve system stability. This paper focuses on the UPFC with conventional POD controller and UPFC with PI controller are placed between two machine system inorder to support voltage and damp the oscillation using MATLAB. © 2014 IEEE.

Metal complexes of Schiff base derived from condensation of 2, 4-dihydroxy benzaldehyde and p-chloroaniline were synthesised and characterized by elemental analysis, IR, 1H NMR spectra, magnetic moment, molar conductance, UV–Visible and thermal analysis (TGA). From the elemental analysis data, the complexes were proposed to have the general formula [M (HL)] where M = Cu(II), Ni(II) and Zn(II). The molar conductance data revealed that all the metal chelates were non-electrolytes. The IR spectra showed that, HL is coordinated to the metal ions in a tetradentate manner with donor sites of the azomethine-N, phenolic-OH. The synthesized ligand, in comparison to its metal complexes were screened for their antibacterial activity against bacterial species, Escherichia coli, Pseudomonas, Bacillus subtillus, Staphylococcus aureus. The activity data showed that the metal complexes to be more potent/antimicrobial than the parent Shciff base ligand against one or more microbial species. From the magnetic moment and electronic spectra data, it is found that the geometrical structures of these complexes are square planar. The thermal behaviour of these chelates showed that decomposition of the anions and ligand molecules in subsequent steps. © 2016, Sphinx Knowledge House. All rights reserved.

Maithili G.,Nandha Engineering College
Proceeding of the IEEE International Conference on Green Computing, Communication and Electrical Engineering, ICGCCEE 2014 | Year: 2014

This paper presents a new possible topology which improves power quality. Real and Reactive Power (PQ) theory in Pulse Width Modulation Voltage Source Inverter (PWM-VSI) to be connected in AC load, which compensates harmonics and reactive power in the ac grid. The objective of this paper is to show that with an adequate control, the converter can not only transfer the AC from wind energy system, but also can improve the power quality of electrical system. The two-level and three-level configuration are mainly considered here, since both of the two configurations have been widely used in the wind energy system. In this improved full-bridge three-level (IFBTL) dc/dc converter is used. © 2014 IEEE.

Krishna Gandhi P.,Nandha Engineering College
ICACCS 2013 - Proceedings of the 2013 International Conference on Advanced Computing and Communication Systems: Bringing to the Table, Futuristic Technologies from Around the Globe | Year: 2014

In large power system generators are requires to maintain synchronism with grid in order to provide standard service to customer utilization. Long distance AC transmission is often subjected to stability problems which affect the transmission capacity. Thyristor controlled series compensator (TCSC) is an important device in FACTS family then it is widely recognized as an effective and economical means to solve the power system stability problem. The variable impedance capability of TCSC is used as series compensator in transmission system for enhancing the transient stability. For obtaining the varying impedance, controllers based speed deviation namely bang-bang and non-linear controller are used. The simulation results show that variable impedance provides improvement in transient stability limit compared with fixed impedance TCSC. Also among the two controllers, non-linear controller provides an improving damping of power system oscillations. To validate the performance of this scheme, the simulation studies are carried out on a single machine infinite bus system using MATLAB. © 2013 IEEE.

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