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Panchal H.,Gujarat University | Panchal H.,Gujarat Power Engineering and Research Institute
International Journal of Energy and Environmental Engineering | Year: 2012

Potable water is always a need of every human being in the world. Only one third of water is potable water, and two thirds of water is saline water, which is not used for drinking purposes. Solar still is a device, which converts the saline or brackish water into drinkable water. Here, in place of saline water, industrial wastewater is used to convert potable water. In this research work, three solar stills have developed by locally available materials and tested in climate conditions of Mehsana (latitude of 23°59′ and the longitude of 72°38′). Among three solar stills, two solar stills are consist of floating plates like aluminum and galvanized iron. Third solar still that is used as a reference solar still is called a conventional solar still. Three-month research showed that solar still, consists of aluminum floating plate, gave considerable daily distillate as well as cumulative output compared with galvanized iron floating plate solar still as well as conventional solar still. Hence, the performance of solar still could increase by the use of aluminum floating plate, which can be used as an energy absorbing plate. © 2012 Panchal and Shah; licensee Springer.

Mehta A.,Gujarat Power Engineering and Research Institute
IEEE International Symposium on Industrial Electronics | Year: 2013

This paper discusses about the application of sliding mode control to the buck converter with modified sliding function. The modified sliding function allows a degree of freedom to determine the dynamic behaviour of overall system. The modification in sliding function leads to tracking of reference with negligible steady state error. The existence region on the phase plane where sliding mode occurs is discussed and analysed. The superiority of the controller over the conventional sliding mode controller is demonstrated by the simulation results. © 2013 IEEE.

Panchal H.N.,Gujarat Power Engineering and Research Institute
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2013

Solar still is a very simple device, which is used for solar distillation process. In this research work, double basin solar still is made from locally available materials. Double basin solar still is made in such a way that, outer basin is exposed to sun and lower side of inner basin is directly connected with evacuated tubes to increase distillate output and reducing heat losses of a solar still. The overall size of the lower basin is about 1006 × 325 × 380 mm, the outer basin is about 1006 × 536 × 100 mm Black granite gravel is used to increase distillate output by reducing quantity of brackish or saline water in the both basins. Several experiments have conducted to determine the performance of a solar still in climate conditions of Mehsana (latitude of 23 59′ and longitude of 72 38′), Gujarat, like a double basin solar still alone, double basin solar still with different size black granite gravel, double basin solar still with evacuated tubes and double basin solar still with evacuated tubes and different size black granite gravel. Experimental results show that, connecting evacuated tubes with the lower side of the inner basin increases daily distillate output of 56% and is increased by 60, 63 and 67% with average 10, 20 and 30 mm size black granite gravel. Economic analysis of present double basin solar still is 195 days. © 2013 Allerton Press, Inc.

Patel R.P.,Gujarat Power Engineering and Research Institute
Proceedings - IEEE International Conference on Information Processing, ICIP 2015 | Year: 2015

Cloud Computing is characterized by dynamically scalable resources provided as a service over the Internet. Due to the dynamic nature of the clouds, the services may be affected when network traffic is congested or server is down. This can be a significant barrier to achieve the task. In clouds, this problem can be solved by migrating services on different nodes or clusters so that the consumers can avail the services without delay in any type of failure case and also the communication costs and time can be reduced effectively. We can also manage the load using the service migration in the cluster among the nodes. In this paper, we consider the problem of service migration in the cloud computing environment. We have proposed a framework and the technique to facilitate service migration. © 2015 IEEE.

Patel V.,Gujarat Power Engineering and Research Institute | Patel V.,Pandit Deendayal Petroleum University | Patel R.,Pandit Deendayal Petroleum University | Savsani V.,Pandit Deendayal Petroleum University
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) | Year: 2014

Shell and Tube Heat Exchangers (STHE) are the most versatile type of heat exchangers used in industrial applications. The shape of Shell side of the traditional STHE's is cylindrical for industrial applications. On one hand, STHE have some good features but on the other hand, it has some limitations due to the cylindrical geometry of the shell side. Some of these limitations are maximum two shell pass is possible as per TEMA layout, complete counter flow cannot be achieved, possibility of reverse heat transfer when number of tube passes are more, tubes are always laid parallel to shell and mounting over the entire length of shell is not possible when impingement plate provided etc. The objective of this study is to design a novel heat exchanger to overcome the limitations of traditional STHE. An experimental setup has been designed with rectangular shell side for STHE. The novel heat exchanger provides the flexibility to increase the number of shell pass and complete counter flow can be achieved due to rectangular geometry of shell side. For the same heat transfer rates, the proposed novel heat exchanger design provides better Effective Mean Temperature Difference (EMTD) and hence less surface area for heat transfer in comparison with traditional STHE. The experiments have been conducted on novel heat exchangers under different operation conditions of hot and cold fluids. The experiment results are compared with theoretical estimations of overall heat transfer coefficient and Log Mean Temperature Difference (LMTD) for traditional shell and tube heat exchangers for the same operation conditions. The results show that under the same operation conditions, the performance of novel heat exchanger is much better than traditional STHE. Copyright © 2014 by ASME.

Panchal H.N.,Gujarat University | Panchal H.N.,Gujarat Power Engineering and Research Institute | Shah P.K.,Sal Institute of Technology and Research
International Journal of Ambient Energy | Year: 2014

In this present work, the lower basin is connected to the conventional vacuum tubes, hence the temperature of water remains higher throughout the day and the distillate output also remains higher and always releases the latent heat of condensation to the upper basin for heating of water and enhancement of the distillate output. In this research paper, the double basin solar still with vacuum tubes fabricated wastested in climate conditions of Mehsana, (23.6000°N, 72.4000°E), Gujarat, with three different water depths 0.03, 0.04 and 0.05 m inside the lower basin and upper basin for one year time period of January 2012 to December 2012. It has been found that the double basin solar still with 0.03 m depth produced more compared with 0.04 kg and 0.05 m. It has also found that the average distillate output of the present system was found to be 8 with the monetary value of produced water being around 0.37 Rs/kg. © 2014 © 2014 Taylor & Francis.

Panchal H.N.,Gujarat Power Engineering and Research Institute
Frontiers in Energy | Year: 2015

The aims of this paper is to investigate the effects of various materials inside the solar still on the increase of the productivity of potable water. Here, blue metal stones and cow dung cakes were used as materials. To investigate their effect, three identical solar stills with an effective area of 1 m square made from locally available materials were tested in climate conditions of Mehsana (23°50′ N 72° 23′). The first and second solar stills were filled with blue metal, stones and cow dung cakes, while the third one was taken as a reference which consisted of only blue paint at the basin. The experiments show that blue metal stones have the highest distillate output at daytime, followed by cow dung cakes solar still and reference solar still. On the other hand, the overall distillate output of blue metal stones and cow dung cakes at daytime as well as at night were 35% and 20% compared with that of reference solar still. © 2015, Higher Education Press and Springer-Verlag Berlin Heidelberg.

Gaur H.,Gujarat Power Engineering and Research Institute | Goliya R.K.,Jaypee University of Engineering & Technology
Buildings | Year: 2015

As the height of buildings increases, effect of shear lag also becomes considerable in the design of high rise buildings. In this paper, shear lag effect in tall buildings of heights, i.e., 120, 96, 72, 48 and 36 stories of which aspect ratio ranges from 3 to 10 is studied. Tube in tube structural system with façade bracing is used for designing the building of height 120 story. It is found that bracing system considerably reduces the shear lag effect and hence increases the building stiffness to withstand lateral loads. Different geometric patterns of the bracing system are considered. The best effective geometric configuration of a bracing system is concluded in this study. Lateral force, as wind load, is applied on the buildings as it is the most dominant lateral force for such heights. Wind load is set as per Indian standard code of Practice IS 875 Part 3. For analysis purposes, the SAP2000 software program is used. © 2015 by the authors.

Panchal H.N.,Gujarat Power Engineering and Research Institute
Renewable and Sustainable Energy Reviews | Year: 2016

Solar energy is an abundant and safe source of vitality and therefore is distinguished as one of the most promising alternative energy choices. Nevertheless, solar energy is intermittent in nature as there is not sun at night. Its total availability value is seasonal and is hooked on the meteorological conditions of locations. Hence, solar energy presents an unsteady energy resource. So, thermal energy storage will be necessary to save the available solar energy at a period of no load or when excessive solar energy is available and to make up for the shortage of energy when the load is in need of energy. The distillate output of a solar still is low i.e., 3 l/day, hence it is not used in the industrial and domestic applications and it is used during the sunshine hours. Hence, for the effective use of solar still, the distillate output needs to be increased. Hence, thermal energy storage materials are used to store the energy during the sunshine hours and release during off-sunshine hours for increment in distillate output. This article reviews the different thermal energy storage materials tried by various researchers in India to improve the distillate output of a solar still. © 2016 Elsevier Ltd. All rights reserved.

Patel V.G.,P.A. College | Chaudhary H.L.,Gujarat Power Engineering and Research Institute
Proceedings - 2015 2nd IEEE International Conference on Advances in Computing and Communication Engineering, ICACCE 2015 | Year: 2015

Delay Tolerant Network is wireless disconnection network where delays take place frequently and where end-to-end connectivity does not exist. Many of the protocols are blindly forward messages due to lack of knowledge so efficiency of the node decreases. To achieve efficient routing, in this paper we propose the two volatile phase spray and wait routing strategy using different aspects like meeting time, buffer time, schedule energy and TTL. In addition, we compare our strategy with shall also other strategies through Opportunistic Network Environment Simulator. Simulation results show that our proposed volatile spray and wait strategy performs better than that of others. © 2015 IEEE.

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