Nagaraj S.V.,RMK Engineering College
Advances in Intelligent Systems and Computing | Year: 2012
We look at various security aspects of multi-agent systems that are often overlooked by developers designing such systems. We look at some of the key security challenges in multi-agent systems. We focus on techniques that help to ensure that security of multi-agent systems is not compromised. © 2012 Springer-Verlag.
Sekar S.,RMK Engineering College |
Saravanan R.,Anna University
International Journal of Exergy | Year: 2011
Vapour Absorption Heat Transformers (VAHT) have shown good potential for upgrading waste heat to useful temperature levels. VAHT can be effectively coupled with Multi Effect Desalination (MED) systems for water purification. In this study an exergetic analysis is carried out for VAHT integrated with MED. A simulation model has been developed to evaluate the exergetic efficiency, exergy losses in the components and exergy balance of the system. The effects of operating parameters such as heat source temperature, sink temperature, effectiveness of solution heat exchanger are evaluated on the performance of the system. Exergy efficiency varies from 11.14% to 35.35% depending upon the temperatures of heat source and sink. It is foundthat the highest exergy loss is in the condenser of VAHT, followed by second effect of MED. © 2011 Inderscience Enterprises Ltd.
Umamaheswari M.G.,Anna University |
Umamaheswari M.G.,RMK Engineering College |
Uma G.,Anna University
Electric Power Systems Research | Year: 2013
In this paper, the analysis and design of reduced order linear quadratic regulator (ROLQR) control for power factor correction (PFC) in a three phase system is presented. The front end is a three phase diode rectifier followed by DC-DC Cuk converter modules with the common DC output. Instantaneous symmetrical component theory is used for the generation of reference current. The control strategy uses three inner ROLQR current controllers for source current shaping and an outer voltage loop using PI controller for load voltage regulation. It uses a single stage converter for both PFC and voltage regulation. The proposed method offers simple control strategy, fast transient response and power factor closed to unity. This type of three-phase three switch PFC converter features a simple and robust configuration compared to conventional six switch topology. To validate the proposed method, a prototype controlled by dSPACE 1104 signal processor is set up. Simulation and experimental results indicate that the proposed system offers regulated output voltage for wide load variations and power factor close to unity. © 2012 Elsevier B.V.
Chairma Lakshmi K.R.,RMK Engineering College
Lecture Notes in Electrical Engineering | Year: 2015
The electrical performance and reliability of Solar PV Power Generation System (SPVPGS) is strictly influenced by irradiance, elevated solar PV cell operating temperature, dust and wind. In order to utilize solar PV power and increase SPVPGS efficiency, it is necessary to keep both the solar PV cell temperature and reflection as low as possible. This article presents a new technique to improve solar photovoltaic (PV) panel efficiency. In this work, the efficiency of SPVPGS is enhanced by maintaining solar PV panel temperature as minimum using sprayer arrangement. Water-cooling system is implemented using a chilled water source and a perforated tube which is fitted on the top of the solar PV panel. The cooling water directly wets the solar PV panel active surface, thereby decreasing the temperature of the panel at the same time which decreasing the light reflection loss and cleaning the solar PV panel surface. Experimental results show that the efficiency of solar PV panel is increased 2–4% more than traditional stand alone SPVPGS by reducing thermal loss, dust effect and reflection loss. © Springer India 2015.
Sureshkumar R.,RMK Engineering College |
Mohideen S.T.,Indian Institute of Road and Transport Technology |
Nethaji N.,DDCSM Polytechnic College
Renewable and Sustainable Energy Reviews | Year: 2013
Extensive research work on heat transfer in heat pipe using conventional working fluids has been carried out over the past decade. Heat transfer in heat pipes using suspensions of nano meter-sized solid particles in base liquids have been investigated in recent years by various researchers across the world for finding new opportunities. The suspended nanoparticles effectively enhance the transport properties and heat transfer characteristics of base fluids in heat pipes. The study reveals an improvement in the thermal efficiency and reduction in the thermal resistance of heat pipe with nanofluids, than that of conventional working fluids. This paper reviews and summarizes recent research on fluid flow and the heat transfer characteristics of nanofluids in heat pipes and identifies perspective of nanofluids that can be used in heat pipes for further research. © 2012 Elsevier Ltd.