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G.n. Tiwari - One of the best experts on this subject based on the ideXlab platform.
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thermal and electrical performance evaluation of photo voltaic thermal compound parabolic concentrator integrated fixed dome biogas plant
Renewable Energy, 2020Co-Authors: A. K. Singh, Raghvendra Singh, G.n. TiwariAbstract:Abstract Based on energy balance equation for photo-voltaic thermal compound parabolic concentrator (PVT-CPC) integrated bio-gas plant, an analytical expression for slurry, absorber plate and solar cell temperature has been derived in terms of design and Climatic parameters. Effect of number of PVT-CPC collectors, packing factor, mass flow rate, etc. on optimum slurry temperature for Indian Climatic Condition has been studied. Further, the thermal and electrical analysis of proposed system has also been carried out. Based on numerical computation for cold Climatic Condition of Srinagar, India, and for given mass flow rate in collector loop, the slurry temperature increases significantly with increasing in number of collectors as expected. Packing factor of photo-voltaic thermal (PVT) system plays an important role in optimization of thermal and electrical power output for efficient operation of biogas plant.
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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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application of genetic algorithm with multi objective function to improve the efficiency of glazed photovoltaic thermal system for new delhi india Climatic Condition
Solar Energy, 2015Co-Authors: Sonveer Singh, G.n. Tiwari, Sanjay K Agarwal, Deepika ChauhanAbstract:Abstract The aim of this paper is to investigate an improvement in the efficiency of photovoltaic thermal (PVT) system with the help of Genetic Algorithm (GA) with multi-objective functions for New Delhi, India Climatic Condition. There are several parameters influencing efficiency of PVT system which inter alia include length and depth of the channel, velocity of air fluid flowing into the channel, thickness of the tedlar and glass, temperature of inlet fluid. All these parameters have been considered to optimize the efficiency of the PVT system. An attempt has also been made to model and optimize the parameters of glazed hybrid single channel PVT module considering the two objective functions separately which are: (i) the overall exergy efficiency (ii) the overall thermal efficiency. Using GA, both of the above objective functions are separately optimized and analyzed for each of the two cases: namely, Case-I: Improvement in exergy and thermal efficiency when overall exergy efficiency is optimized and Case-II: Improvement in exergy and thermal efficiency when overall thermal efficiency is optimized. The variables used in GA are those that could be varied, keeping parameters like solar radiation, ambient temperature unchanged in the algorithmic calculation. The electrical and thermal efficiencies after optimization were found 14.15%, 11.88% and 14.08%, 19.48% respectively. Similarly the overall exergy and thermal efficiency are 14.87% and 56.54% respectively for both the cases. It has been observed that there is improvement in overall exergy efficiency and overall thermal efficiency by 4.6% and 13.14% respectively during the optimization process.
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performance study of the inverted absorber solar still with water depth and total dissolved solid
Applied Energy, 2011Co-Authors: Sabah A Abdulwahab, G.n. TiwariAbstract:In this communication, an experimental study of inverted absorber solar still (IASS) and single slope solar still (SS) at different water depth and total dissolved solid (TDS) is presented. Experiments are conducted for the Climatic Condition of Muscat, Oman. A thermal model is also developed for the IASS and validated with experimental results. A fair agreement is found for the daytime operation of the IASS. It is observed that higher water temperature can be achieved by using the IASS in comparison to the SS. The daily yield obtained from the IASS are 6.302, 5.576 and 4.299Â kg/m2-day at water depths (dw) 0.01, 0.02 and 0.03Â m respectively. At same respective water depths, the daily yield obtained from the SS are 2.152, 1.931, 0.826Â kg/m2-day respectively lower than that of the IASS. It is observed that for Climatic Condition of Muscat, Oman, the optimum water depth for the IASS is 0.03Â m above which the addition of reflector under the basin does not affect its performance much more in comparison to that of the SS for sea water. The feed saline water and yielded distilled water are also compared for different TDS values, pH, and electrical conductance. On the basis of economic analysis of IASS, it is found that the annualized cost of distilled water in Indian rupees for Muscat Climatic Condition is Rs. 0.74, 0.66 and 0.62 (conversion factors: $ 1Â =Â Rs. 50 and 1 OMRÂ =Â Rs. 120) for the life time of 15, 20 and 25Â years respectively.
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effect of water depths on heat and mass transfer in a passive solar still in summer Climatic Condition
Desalination, 2006Co-Authors: Anil Kr Tiwari, G.n. TiwariAbstract:In this communication, an attempt has been made to find out the effect of water depth on evaporative mass transfer coefficient for a passive single-slope distillation system in summer Climatic Condition. The experiments have been conducted on a south facing, single slope, solar still of 30° inclination of condensing cover, in summer Climatic Condition for 24 h on different five days for different five water depths from 0.04 m to 0.18 m. The objective of the present paper is to study the behavioral variation in internal heat transfer coefficients with respect to the water depth in the still. It is understood that the heat transfer coefficients depends significantly on water depths. It is also observed that the nocturnal distillation is significant in the case of higher water depths because of reduced ambient and stored energy within it.
Caglar Yalcinkaya - One of the best experts on this subject based on the ideXlab platform.
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elephant skin formation on uhpc surface effects of Climatic Condition and blast furnace slag content
Construction and Building Materials, 2021Co-Authors: Caglar Yalcinkaya, Oguzhan CopurogluAbstract:Abstract Ultra-high performance concrete (UHPC), which typically contains extremely high superplasticizer amount, tends to render a special type of dense surface layer, especially under drying Conditions. Even if the inner side of fresh UHPC is still in a flowable nature, the top surface of the concrete which is exposed to ambient Conditions renders a dense cover called “elephant skin” in a short time after casting. In this study, the effects of Climatic Conditions and ground granulated blast furnace slag (GGBS) replacement on the elephant skin formation were studied. The influence of elephant skin formation on the macropore profile was assessed by micro-computed tomography scan. Observations revealed that any drying Condition that does not lead to water vapor condensation on the fresh surface can trigger the formation of elephant skin within minutes after casting. Both microscopic and micro-computed tomography investigations showed that as a result of elephant skin formation, most of the air bubbles cannot escape from the fresh matrix, and locate under the skin. These air bubbles and elephant skin itself result in a multi-layered structure in UHPC body throughout the cross-section and reduce the aesthetics of the casting surface. Increasing GGBS replacement percentage significantly reduced the superplasticizer demand which is responsible for skin formation, however, did not eliminate the problem.
Oguzhan Copuroglu - One of the best experts on this subject based on the ideXlab platform.
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elephant skin formation on uhpc surface effects of Climatic Condition and blast furnace slag content
Construction and Building Materials, 2021Co-Authors: Caglar Yalcinkaya, Oguzhan CopurogluAbstract:Abstract Ultra-high performance concrete (UHPC), which typically contains extremely high superplasticizer amount, tends to render a special type of dense surface layer, especially under drying Conditions. Even if the inner side of fresh UHPC is still in a flowable nature, the top surface of the concrete which is exposed to ambient Conditions renders a dense cover called “elephant skin” in a short time after casting. In this study, the effects of Climatic Conditions and ground granulated blast furnace slag (GGBS) replacement on the elephant skin formation were studied. The influence of elephant skin formation on the macropore profile was assessed by micro-computed tomography scan. Observations revealed that any drying Condition that does not lead to water vapor condensation on the fresh surface can trigger the formation of elephant skin within minutes after casting. Both microscopic and micro-computed tomography investigations showed that as a result of elephant skin formation, most of the air bubbles cannot escape from the fresh matrix, and locate under the skin. These air bubbles and elephant skin itself result in a multi-layered structure in UHPC body throughout the cross-section and reduce the aesthetics of the casting surface. Increasing GGBS replacement percentage significantly reduced the superplasticizer demand which is responsible for skin formation, however, did not eliminate the problem.
Raghvendra Singh - One of the best experts on this subject based on the ideXlab platform.
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thermal and electrical performance evaluation of photo voltaic thermal compound parabolic concentrator integrated fixed dome biogas plant
Renewable Energy, 2020Co-Authors: A. K. Singh, Raghvendra SinghAbstract:Abstract Based on energy balance equation for photo-voltaic thermal compound parabolic concentrator (PVT-CPC) integrated bio-gas plant, an analytical expression for slurry, absorber plate and solar cell temperature has been derived in terms of design and Climatic parameters. Effect of number of PVT-CPC collectors, packing factor, mass flow rate, etc. on optimum slurry temperature for Indian Climatic Condition has been studied. Further, the thermal and electrical analysis of proposed system has also been carried out. Based on numerical computation for cold Climatic Condition of Srinagar, India, and for given mass flow rate in collector loop, the slurry temperature increases significantly with increasing in number of collectors as expected. Packing factor of photo-voltaic thermal (PVT) system plays an important role in optimization of thermal and electrical power output for efficient operation of biogas plant.
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thermal and electrical performance evaluation of photo voltaic thermal compound parabolic concentrator integrated fixed dome biogas plant
Renewable Energy, 2020Co-Authors: A. K. Singh, Raghvendra Singh, G.n. TiwariAbstract:Abstract Based on energy balance equation for photo-voltaic thermal compound parabolic concentrator (PVT-CPC) integrated bio-gas plant, an analytical expression for slurry, absorber plate and solar cell temperature has been derived in terms of design and Climatic parameters. Effect of number of PVT-CPC collectors, packing factor, mass flow rate, etc. on optimum slurry temperature for Indian Climatic Condition has been studied. Further, the thermal and electrical analysis of proposed system has also been carried out. Based on numerical computation for cold Climatic Condition of Srinagar, India, and for given mass flow rate in collector loop, the slurry temperature increases significantly with increasing in number of collectors as expected. Packing factor of photo-voltaic thermal (PVT) system plays an important role in optimization of thermal and electrical power output for efficient operation of biogas plant.
A. K. Singh - One of the best experts on this subject based on the ideXlab platform.
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thermal and electrical performance evaluation of photo voltaic thermal compound parabolic concentrator integrated fixed dome biogas plant
Renewable Energy, 2020Co-Authors: A. K. Singh, Raghvendra SinghAbstract:Abstract Based on energy balance equation for photo-voltaic thermal compound parabolic concentrator (PVT-CPC) integrated bio-gas plant, an analytical expression for slurry, absorber plate and solar cell temperature has been derived in terms of design and Climatic parameters. Effect of number of PVT-CPC collectors, packing factor, mass flow rate, etc. on optimum slurry temperature for Indian Climatic Condition has been studied. Further, the thermal and electrical analysis of proposed system has also been carried out. Based on numerical computation for cold Climatic Condition of Srinagar, India, and for given mass flow rate in collector loop, the slurry temperature increases significantly with increasing in number of collectors as expected. Packing factor of photo-voltaic thermal (PVT) system plays an important role in optimization of thermal and electrical power output for efficient operation of biogas plant.
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thermal and electrical performance evaluation of photo voltaic thermal compound parabolic concentrator integrated fixed dome biogas plant
Renewable Energy, 2020Co-Authors: A. K. Singh, Raghvendra Singh, G.n. TiwariAbstract:Abstract Based on energy balance equation for photo-voltaic thermal compound parabolic concentrator (PVT-CPC) integrated bio-gas plant, an analytical expression for slurry, absorber plate and solar cell temperature has been derived in terms of design and Climatic parameters. Effect of number of PVT-CPC collectors, packing factor, mass flow rate, etc. on optimum slurry temperature for Indian Climatic Condition has been studied. Further, the thermal and electrical analysis of proposed system has also been carried out. Based on numerical computation for cold Climatic Condition of Srinagar, India, and for given mass flow rate in collector loop, the slurry temperature increases significantly with increasing in number of collectors as expected. Packing factor of photo-voltaic thermal (PVT) system plays an important role in optimization of thermal and electrical power output for efficient operation of biogas plant.
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phonological growth and development of chickpea cicer arietinum l cultivars at Climatic Condition
International Journal of Chemical Studies, 2019Co-Authors: Ajeet Kumar, A. K. Singh, S R Mishra, R K Aryan, Anil NishadAbstract:A field experiment was conducted during rabi season of 2016 on the topic entitled “Study the crop-weather interaction on chickpea (Cicer arietinum L.) Cultivars” in sandy loam soil of N.D. University of Agriculture and Technology, Kumarganj, Faizabad (U.P). The experimental consisted of nine treatment combinations comprised of three growing environment viz., sowing on Oct.25th with temperature 24.2 0C, Nov.4th with temperature 22.5 0C and Nov.14th with temperature 22.2 0C and three varieties viz. Radhey, Pusa-372, and BG-256. Results revealed that Heat use efficiency (0.62 gm-2 0C day-1)and radiation use efficiency (1.6 g/MJ) was recorded when sowing was done sown Oct.25thwith temperature 24.2 0C followed by sowing done on Nov.4th while lowest heat use efficiency and radiation use efficiency was recorded when sowing was done on Nov.14th with sowing temperature 22.2 0C. Radhey cultivar was found more conducive and remunerative for growth development seed yield radiation use efficiency and heat use efficiency.