The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
G.n. Tiwari - One of the best experts on this subject based on the ideXlab platform.
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exergy analysis of n photovoltaic thermal compound parabolic concentrator n pvt cpc Collector for constant collection temperature for vapor absorption refrigeration var system
Solar Energy, 2018Co-Authors: G.n. Tiwari, Md Meraj, M E KhanAbstract:Abstract In the present paper, the operating parameters of N-fully covered semitransparent photovoltaic thermal-compound parabolic concentrator (PVT-CPC) Collector for constant collection temperature mode have been analyzed on the basis of an overall exergy analysis. The proposed system for a given design and climatic parameters will be applicable to the vapor absorption refrigeration system. The analyses are based on basic energy balance of each components, namely, solar cell, absorber Plate, concentrator, flowing fluid, etc. Numerical computations have been carried out for New Delhi climatic condition by using MATLAB R2015a. The performance of the proposed system has also been compared with the performance of photovoltaic thermal-flat Plate Collector (PVT-FPC), conventional flat Plate-compound parabolic concentrator (FPC-CPC) and conventional flat Plate Collector (FPC). Following conclusions have been made: (i) An overall exergy of N-fully covered semitransparent PVT-CPC system decreases with the increase in constant collection temperature, (ii) An overall thermal energy of N-fully covered semitransparent PVT-CPC system increases with the decrease in packing factor (βc) and. (iii) PVT-CPC and PVT-FPC with fully covered semitransparent are self-sustained Collectors to be used for vapor absorption refrigeration system. The proposed system will be most appropriate for vapor absorption refrigeration (VAR) systems.
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exergoeconomic and enviroeconomic analyses of partially covered photovoltaic flat Plate Collector active solar distillation system
Desalination, 2015Co-Authors: G.n. Tiwari, I M Alhelal, J K Yadav, Desh Bandhu Singh, Ahmed M AbdelghanyAbstract:Abstract This paper presents an exergoeconomic and enviroeconomic analyses of partially covered photovoltaic thermal (PVT) flat Plate Collector (FPC) integrated solar distillation system known as PVT-FPC active solar distillation system. The analysis is based on experimental studies for composite climatic condition of New Delhi. The hourly thermal, exergy, electrical, overall exergy and overall thermal efficiency have been evaluated and the results have been compared with the results obtained by earlier researchers. It has been observed that the proposed PVT-FPC active solar distillation system can meet the daily requirement of potable water as well as DC electrical power during sunshine hours.
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analytical characteristic equation for partially covered photovoltaic thermal pvt compound parabolic concentrator cpc
Solar Energy, 2015Co-Authors: Deepali Atheaya, G.n. Tiwari, Arvind Kumar Tiwari, I M AlhelalAbstract:Abstract In this paper, an analytical expression for characteristic equation of a partially covered photovoltaic thermal compound parabolic concentrator (PVT-CPC) water Collector system similar to Hottel–Whillier–Bliss (HWB) equation of flat Plate Collector has been derived. The derivation is based on basic energy balance equation for each component of partially covered PVT-CPC water Collector system. The analytical result of proposed partially covered PVT-CPC water Collectors [case (i)] has been compared with [case (ii)]: fully covered PVT-CPC water Collectors; [case (iii)]: conventional CPC water Collectors and [case (iv)]: partially covered PVT water Collectors. It is observed that (a) an overall exergy efficiency of partially covered PVT-CPC water Collector (25%PV) system is maximum and (b) an instantaneous thermal efficiency of conventional CPC water Collector system [case (iii)] is maximum as compared to other cases.
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thermal modeling of a combined system of photovoltaic thermal pv t solar water heater
Solar Energy, 2008Co-Authors: Swapnil Dubey, G.n. TiwariAbstract:Abstract In this paper, an integrated combined system of a photovoltaic (glass–glass) thermal (PV/T) solar water heater of capacity 200 l has been designed and tested in outdoor condition for composite climate of New Delhi. An analytical expression for characteristic equation for photovoltaic thermal (PV/T) flat Plate Collector has been derived for different condition as a function of design and climatic parameters. The testing of Collector and system were carried out during February–April, 2007. It is observed that the photovoltaic thermal (PV/T) flat Plate Collector partially covered with PV module gives better thermal and average cell efficiency which is in accordance with the results reported by earlier researchers.
D D Ganji - One of the best experts on this subject based on the ideXlab platform.
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experimental validation of dynamic simulation of the flat Plate Collector in a closed thermosyphon solar water heater
Energy Conversion and Management, 2011Co-Authors: Hessam Taherian, A Rezania, S Sadeghi, D D GanjiAbstract:This work studies the dynamic simulation of thermosyphon solar water heater Collector considering the weather conditions of a city in north of Iran. The simulation was done for clear and partly cloudy days. The useful energy, the efficiency diagrams, the inlet and the outlet of Collector, center of the absorber and center of the glass cover temperatures, were obtained. The simulation results were then compared with the experimental results in fall and showed a good agreement.
Vanessa Montoro Taborianski - One of the best experts on this subject based on the ideXlab platform.
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optimization of tank and flat Plate Collector of solar water heating system for single family households to assure economic efficiency through the trnsys program
Renewable Energy, 2006Co-Authors: Juliana Benoni Arruda Lima, Racine Tadeu Araujo Prado, Vanessa Montoro TaborianskiAbstract:Solar water heating systems are widely used in Brazil for domestic purposes in single-family households. The exploitation of the potential energy of the water from the upper tank and the thermosyphon phenomena for hot water circulation constitutes the absolute majority of the residential solar water heating systems in the country. But, these water heating systems are usually sized according to tables provided by the manufacturers, which show the number of Plates required based on the size of the family and the number of hot water outlets. This sizing is based much more on intuition rather than on scientific data. For that reason, this work has developed an optimization model for water heating systems design parameters, using a numerical simulation routine, in a long-term transient regime. The optimized design gives the slope and area of the flat Plate Collector, which results in the minimum cost over the equipment life cycle. The computing procedure was executed considering specific characteristics of the project. A thermosyphon solar water heating system with flat-Plate Collector for Sao Paulo's climate was simulated. The practice of Brazilian designers and manufacturers is to recommend the maximization of the energetic gain for the winter. This paper has analyzed in economic terms if it is more attractive to increase the gain of solar energy in the winter period, with the consequence of reduction of the solar energy gain along the year, or to adopt the adequate slope, which improves the yearly solar energy gain.
Hessam Taherian - One of the best experts on this subject based on the ideXlab platform.
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experimental validation of dynamic simulation of the flat Plate Collector in a closed thermosyphon solar water heater
Energy Conversion and Management, 2011Co-Authors: Hessam Taherian, A Rezania, S Sadeghi, D D GanjiAbstract:This work studies the dynamic simulation of thermosyphon solar water heater Collector considering the weather conditions of a city in north of Iran. The simulation was done for clear and partly cloudy days. The useful energy, the efficiency diagrams, the inlet and the outlet of Collector, center of the absorber and center of the glass cover temperatures, were obtained. The simulation results were then compared with the experimental results in fall and showed a good agreement.
Juliana Benoni Arruda Lima - One of the best experts on this subject based on the ideXlab platform.
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optimization of tank and flat Plate Collector of solar water heating system for single family households to assure economic efficiency through the trnsys program
Renewable Energy, 2006Co-Authors: Juliana Benoni Arruda Lima, Racine Tadeu Araujo Prado, Vanessa Montoro TaborianskiAbstract:Solar water heating systems are widely used in Brazil for domestic purposes in single-family households. The exploitation of the potential energy of the water from the upper tank and the thermosyphon phenomena for hot water circulation constitutes the absolute majority of the residential solar water heating systems in the country. But, these water heating systems are usually sized according to tables provided by the manufacturers, which show the number of Plates required based on the size of the family and the number of hot water outlets. This sizing is based much more on intuition rather than on scientific data. For that reason, this work has developed an optimization model for water heating systems design parameters, using a numerical simulation routine, in a long-term transient regime. The optimized design gives the slope and area of the flat Plate Collector, which results in the minimum cost over the equipment life cycle. The computing procedure was executed considering specific characteristics of the project. A thermosyphon solar water heating system with flat-Plate Collector for Sao Paulo's climate was simulated. The practice of Brazilian designers and manufacturers is to recommend the maximization of the energetic gain for the winter. This paper has analyzed in economic terms if it is more attractive to increase the gain of solar energy in the winter period, with the consequence of reduction of the solar energy gain along the year, or to adopt the adequate slope, which improves the yearly solar energy gain.
