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Jakhar S.,Center for Renewable Energy and Environment Development | Misra R.,Government Engineering College | Bansal V.,University of Kota | Soni M.S.,BITS Pilani
Energy and Buildings | Year: 2015

In the present research thermal performance of earth air tunnel heat exchanger (EATHE) coupled with a solar air heating duct has been experimentally evaluated for arid climate of Ajmer city of northwestern India, during winter season. An attempt has been made to enhance the heating capacity of EATHE system by coupling it with a solar air heating duct at the exit end. Results show that the air which comes out of coupled EATHE system is relatively hotter than the air supplied by the stand alone EATHE system. It was found that the heating capacity of EATHE system got increased by 1217.625-1280.753 kWh when it was coupled with solar air heating duct with a substantial increase in room temperature by 1.1-3.5 °C. The COP of the system also increased up to 4.57 when assisted with solar air heating duct. Therefore, the heating capacity of EATHE can be significantly increased by coupling it with solar air heating duct. © 2014 Elsevier B.V. Source


Gakkhar N.,Center for Renewable Energy and Environment Development | Soni M.S.,Center for Renewable Energy and Environment Development
Energy Procedia | Year: 2014

India lies in the sunniest regions of the world and has a high potential for solar energy for power generation, given that both technology routes for conversion of solar radiation into heat and electricity. One of the technologies, Concentrating Solar Power (CSP) uses direct sunlight, concentrating it to the focus of solar thermal concentrating systems where the light is absorbed by some material surface to produce high temperatures. The CSP can also be used for centralized level with high power requirement. The current work focuses on the parameters required for the commissioning of the Concentrating Solar Power plants in India. Various parameters which were relevant to this technology are identified from the literature review and by discussion with experts. To evaluate those identified parameters and to know the perceptions of key players in this area a survey was conducted. Total of thirty nine relevant parameters are considered and categorized under two aspects, viz technical and economical aspects. The main purpose of the research is to determine how the judgment level for different parameters, varies among different groups. The results of this study may be useful for the decision and policy makers of CSP technologies. © 2014 The Authors. Source


Soni M.S.,Center for Renewable Energy and Environment Development | Gakkhar N.,Center for Renewable Energy and Environment Development
Renewable and Sustainable Energy Reviews | Year: 2014

There are two ways by which solar energy can be harnessed viz. solar Photo-Voltaic (PV) and Concentrating Solar Power (CSP). This paper focuses on the parameters required for the commissioning of solar power plants in India using these technologies. The key parameters have been identified through the literature review and discussion with the experts. The parameters thus obtained, are classified under PV and CSP technologies and then categorized into technical and economical parameters. A survey is conducted to understand the perceptions of Indian key players in the area of solar energy and to rank forty one identified parameters. Analysis of survey shows that location of the site and direct investment cost are the highest preferred technical and economical parameters respectively. The results of this study will help decision makers and policy makers of solar technologies in India. © 2014 Elsevier Ltd. Source


Gakkhar N.,Center for Renewable Energy and Environment Development | Soni M.S.,Center for Renewable Energy and Environment Development | Jakhar S.,Center for Renewable Energy and Environment Development
Renewable and Sustainable Energy Reviews | Year: 2016

Solar energy is a clean source of energy and has been used widely for various applications. Exergy analysis, which discussed the grey areas of improvement in various application considers the entropy generations within the systems. Exergetic analysis has been widely used in the performance analysis and exergoeconomic analysis of renewable energy systems. The present study discusses the comprehensive review on exergetic analysis of solar assisted distillation systems with main focus on concentrated solar energy. For the same, general relations used for first law analysis, second law analysis, entropy generation and irreversibilities for each subcomponent is presented. Following this, the exergetic analysis work on Parabolic trough collectors (PTC), heat exchanger and distillation systems are reviewed comprehensively. The future direction for research work in the area of exergy analysis are identified and suitable conclusions are presented. It is expected that this comprehensive study will be beneficial to researchers involved in the second law analysis of solar based distillation systems. © 2015 Elsevier Ltd. All rights reserved. Source


Jakhar S.,Center for Renewable Energy and Environment Development | Soni M.S.,Center for Renewable Energy and Environment Development | Gakkhar N.,Center for Renewable Energy and Environment Development
Renewable and Sustainable Energy Reviews | Year: 2016

Solar photovoltaic (PV) is a commercially proven technology to generate electricity directly from the Sun. However, the major limitation of PV technology is its lower efficiency and higher cost as compared to conventional power generation techniques. These problems can be overcome by concentrating photovoltaic (CPV), which is the fastest growing technology due to its lower cost and higher electrical conversion efficiency (of about 40%). Nevertheless, with the increase in the concentration ratio (CR), the solar cell temperature increases, results in decrease in its efficiency and lifespan. This problem of rise in temperature can be overcome by using a proper cooling technology. In this paper review work of various cooling technologies available for CPV systems has been presented. Cooling technology should be reliable, maintain low and uniform cell temperature, easy to operate and efficient in nature. © 2016 Elsevier Ltd. Source

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