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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.

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.

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.

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