Anantapur, India
Anantapur, India

Time filter

Source Type

Govindarajulu K.,JNTUA
Applied Mechanics and Materials | Year: 2014

The refrigerant R134a used in existing air conditioning system in automobiles is toxic, cost, and affects the ozone layer. Research is going on alternate air conditioning system in automobiles. Vortex tube is a cooling device, to produce cold air and hot air from the source of compressed air without affecting the environment. Reciprocating air compressor run by the vehicle engine shaft, the developed air is stored in storage tank which is set up in back side of the vehicle. Air is supplied in to vortex tube at various pressures to get the required comfort air temperatures. The comparison of the fuel consumption at full load conditions with the Vapor Compression Refrigeration System to the Vortex Tube Refrigeration System. Finally observed that the compressed air used in Vortex Tube Refrigeration System is non toxic, zero ozone depletion, zero global warming potential, inflammable and free of cost and also the operating and running cost per ton of refrigeration is less when compare with the existing air conditioning system used in automobiles. © (2014) Trans Tech Publications, Switzerland.


Reddy G.S.,VNRVJIET | Rajinikanth T.V.,SNIST | Rao A.A.,JNTUA
Souvenir of the 2014 IEEE International Advance Computing Conference, IACC 2014 | Year: 2014

Text clustering is an unsupervised process forming its basis solely on finding the similarity relationship between documents with the output as a set of clusters [14]. In this research, a commonality measure is defined to find commonality between two text files which is used as a similarity measure. The main idea is to apply any existing frequent item finding algorithm such as apriori or fp-tree to the initial set of text files to reduce the dimension of the input text files. A document feature vector is formed for all the documents. Then a vector is formed for all the static text input files. The algorithm outputs a set of clusters from the initial input of text files considered. © 2014 IEEE.


Arulprakasajothi M.,JNTUA | Elangovan K.,Cambridge Institute of Technology | HemaChandra Reddy K.,JNTUA | Suresh S.,National Institute of Technology Tiruchirappalli
Materials Today: Proceedings | Year: 2015

This paper presents the heat transfer study of TiO2/water Nanofluids with different concentrations. Nanofluids have emerged as an exciting new class of nanotechnology based heat transfer fluids and have grown enormously in the past few years. Nanofluids increases the performance of heat exchanging devices than the conventional working fluids. In the present work, TiO2/water nanofluids with various volume concentrations of 0.1%,0.25%,0.5% and0.75% were prepared using two step method for heat transfer study. Stability, thermal conductivity and viscosity measurement was conducted using zeta potential, KD2 Pro and Brookfield Viscometer respectively. Finally, the experiment was conducted using TiO2/water nanofluids as working fluid in a tube heat exchanger to study the heat transfer performance. The experimental results show that the nusselt number increases with an increase of particle volume fraction and the nusselt number enhancement was observed to be 13.2% over the base fluid for volume concentration of 0.75%. From the experimental observations, enhancement in Nusselt number is larger than the enhancement in friction factor. © 2015 Elsevier Ltd.


Neeraja Y.,JCET | Sumalatha V.,JNTUA
Proceedings of the 2015 Science and Information Conference, SAI 2015 | Year: 2015

Wireless networks have experienced sudden improvements from the past decade, and most rapidly developing areas are MANETs. In this paper, we propose an improved backoff scheme for IEEE 802.11 MAC based on Padovan Sequence. A MAC protocol used to address how to resolve the contention and collisions in the communication medium, we performed study and analysis on the existing PBA and BEB algorithms and proposed advanced backoff algorithm (ABA) implemented in IEEE 802.11 in distributed coordinated function mode for better improvement. The ABA reduces the number of collisions, when more than one node shared the medium and leads to the improved network performance. Existing binary exponential backoff algorithm has been proven not to be the optimal algorithm in MANETs due to the exponential increase of the contention window size and degrades the network performance by waiting time. The proposed ABA minimizes the size of contention window and improves the network performance. © 2015 IEEE.


Balaji H.,JNTUA | Govardhan A.,JNTUH College of Engineering
2015 IEEE International Conference on Computational Intelligence and Computing Research, ICCIC 2015 | Year: 2015

Presently a day, for any sort of data, individuals rely on upon web. They utilize web indexes like Google to pursuit data over web. The inquiries must be precise that will give the data identified with client's Health Care. Be that as it may, there is tremendous measure of data on the web as it's hard to get the significant data effortlessly. If there should arise an occurrence of inquiries on right prescription, individuals for the most part have their own particular inclinations. Wellbeing experts require the adaptability of unstructured content to express their conclusions and treatment systems. In this manner, the vicinity of unstructured content is inescapable, be that as it may, for information mining, data frameworks are obliged to change over the unstructured content to an organized representation for examination. Additionally the human advancement where individuals live will have sway on the quantity of decisions of prescription. So the proposed strategy will be utilized to prescribe best medication and nourishment to the clients or patients. These proposals are in view of the positioning of things and nourishments. The trial results give better exactness contrasted with existing strategies. © 2015 IEEE.


Krishna T.M.,CBIT | Anjaneyulu K.S.R.,JNTUA
2015 Conference on Power, Control, Communication and Computational Technologies for Sustainable Growth, PCCCTSG 2015 | Year: 2015

In order to utilize the existing transmission line to its full capacity Flexible AC Transmission system (FACTS) are used. The power flow control is effective if all the elements of the transmission line must be varied simultaneously or individually. To achieve this, the key appropriate FACTS device is Unified Power Flow controller (UPFC). The use of conventional controllers delays the decision making process to take suitable control action during dynamic conditions. In this paper a fuzzy logic based controller is used to generate supplementary damping signals and to control the shunt converter of IPFC. Two separate neuro-controllers are used for series converter control. Hence coordination between shunt and series converters of UPFC is achieved. The results in MATLAB environment will explain the performance of UPFC during step change of real and reactive powers. © 2015 IEEE.


Latha V.S.,JNTUA | Rao D.S.B.,GPREC
IC-GET 2015 - Proceedings of 2015 Online International Conference on Green Engineering and Technologies | Year: 2015

Ethernet technology became predominant due to optimistic nature with proven simplicity, cost, reliability, ease of installation and expandability. This Attractive nature of Ethernet made its existence in any fields of applications such as Industry to Avionics, Video and Voice applications which are intended for higher network speeds. To handle such faster data rates Ethernet has been adopted as alternative technology. The main objective of this paper is to describe Evolution of Ethernet towards the 400GBPS technology and various fields of applications. © 2015 IEEE.


Ravikumar Y.V.L.,Indian Institute of Chemical Technology | Kalyani S.,Indian Institute of Chemical Technology | Satyanarayana S.V.,JNTUA | Sridhar S.,Indian Institute of Chemical Technology
Journal of the Taiwan Institute of Chemical Engineers | Year: 2014

Nanofiltration (NF) and reverse osmosis (RO) are well-established processes for desalination of sea and ground water besides treatment of industrial effluents. Pharmaceutical effluents usually contain organic and inorganic waste materials that contribute to total dissolved solids (TDS), chemical oxygen demand (COD) and biochemical oxygen demand (BOD), rendering the mode of treatment highly challenging. In the present investigation, performance of hydrophilized polyamide (HPA-250) NF and thin film composite (TFC) polyamide RO membranes has been studied for the treatment of pharmaceutical effluent condensate. Effect of applied pressure on separation performance on NF/RO membranes was investigated for both non-aerated (Feed A) and aerated (Feed B) condensates. Influence of concentration polarization and fouling on membrane performance parameters such as flux, water recovery and rejection was evaluated as a function of time. A comparative study on treatment of aerated and non-aerated feed samples was carried out with respect to flux and rejection of TDS, COD and BOD. At a constant feed pressure of 10.34. bar, %rejection of TDS was found to be 78.14 for Feed B and 75.24 for Feed A in NF process whereas the corresponding values for RO were 95.30% and 91.76%. COD removal efficiencies in the same order were observed to be 94.30% and 93.09% for NF and 99.50% and 98.33% for RO. Design and economic estimation of commercial NF/RO systems for processing of 1000. L/h pharmaceutical condensate was carried out. NF process was found to more economical than RO due to advantage of greater flux leading to requirement of lower operating pressures. © 2013 Taiwan Institute of Chemical Engineers.


Reddy G.P.R.,J.N.T.U.A | Kumar M.V.,J.N.T.U.A
7th International Conference on Intelligent Systems and Control, ISCO 2013 | Year: 2013

With the increasing shortage in fossil fuels, and pollution problems renewable energy has become an important energy source. Comparing the all renewable energy sources wind energy is one of the most economical energy sources. In present generating units above 1 MW, variable speed concepts are usually applied that are either based on doubly fed induction generators (DFIG) or Permanent magnet Synchronous generator (PMSG) are mostly used in Wind Energy Conversion Systems (WECS). This paper discusses about the implementation of matrix converter for wind-energy conversion System employing permanent magnet synchronous generator (PMSG). The MATLAB/SIMULINK simulation software are used for simulation. © 2013 IEEE.


Deepa K.,Amrita University | Saju H.M.,Amrita University | Kumar M.V.,JNTUA
2013 International Conference on Control Communication and Computing, ICCC 2013 | Year: 2013

Isolated converters find wide application in SMPS, telecommunication, rectifiers etc. Among these topologies flyback converter is best opted for SMPS applications due to its simplicity in design, operation and less component count. High frequency dc-dc converters are subjected to high switching losses hence an auxiliary switch is designed to perform soft switching in main switch. The devices used in the converter are operated either in ZVS or ZCS to reduce the switching loss of the converter. This improves the converter performance. The converter designed is simulated, realized and presented in detailed for a laboratory model of 1.08W, 3.3V, 50 kHz. © 2013 IEEE.

Loading JNTUA collaborators
Loading JNTUA collaborators