The Experts below are selected from a list of 13362 Experts worldwide ranked by ideXlab platform
Hamdy Hassan - One of the best experts on this subject based on the ideXlab platform.
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energy Payback Time exergoeconomic and enviroeconomic analyses of using thermal energy storage system with a solar desalination system an experimental study
Journal of Cleaner Production, 2020Co-Authors: Mohamed S Yousef, Hamdy HassanAbstract:Abstract In this study, the performance of solar still incorporated with thermal energy storage (TES) unit of phase change material (PCM) is evaluated based on energy and exergy methodologies. Energy Payback Time for solar still with and without PCM is quantified and compared. Furthermore, the performance of both configurations is also evaluated from exergoeconomic and exergoenvironmental points of view. Experiments for solar still with and without PCM are conducted in summer and winter seasons subjected to the weather conditions of Alexandria, Egypt. The findings showed that the addition of a PCM storage unit to solar still system increased the annual energy and exergy savings by 10% and 3%, respectively. The results indicated that the incorporation of PCM in solar still was found ineffective compared to traditional still based on energy Payback Time. Based on the exergy approach, the integration of PCM in the solar still system is not effective where the conventional still (without PCM) achieved more than 400% more CO2 mitigations compared to PCM-based solar still system. Also, the exergoeconomic and exergoenvironmental parameters of the modified system were very poor related to those of traditional still. Therefore, for PCM-based solar stills systems to become competitive from global energy and environmental approaches, attempts should be performed by industrialists and engineers to find storage materials with low embodied energy and with low cost in conjunction with its evaluation from energy and exergy outputs to get a complete picture about the effectiveness of the system. In this case, the potential of thermal energy storage techniques for low-temperature solar-powered desalination systems will be thermodynamically, economically, and environmentally effective.
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assessment of parabolic trough solar collector assisted solar still at various saline water mediums via energy exergy exergoeconomic and enviroeconomic approaches
Renewable Energy, 2020Co-Authors: Mohamed S Yousef, Hamdy Hassan, Mohamed Fathy, Salem M AhmedAbstract:Abstract The performance of parabolic trough solar collector (PTC) coupled with single slope solar still at various water mediums is assessed based on productivity, energy, exergy, exergoeconomic, and enviroeconomic methodologies and also Energy Payback Time. Six solar still systems are considered; conventional solar still (CSS), CSS coupled with PTC (CSS + PTC), CSS contains steel wire mesh in the basin (CSS + WM), CSS contains wire mesh and coupled with PTC (CSS + WM + PTC), CSS contains sand in the basin (CSS + SD), and CSS contains sand and integrated with PTC (CSS + SD + PTC). Experiments are conducted under hot and cold climate conditions of Sohag city, Egypt. Findings show that the maximum freshwater yield in summer is achieved in case of CSS + SD + PTC with an increase of 1.21% compared to CSS and 102.1% compared to CSS + SD + PTC in winter. The maximum increase of the energy and exergy output per year compared to CSS is achieved in case of CSS + SD + PTC of 216.6% and 325%, respectively. Incorporation PTC with the still for all studied water mediums is found promising in terms of energy Payback Time, cost and freshwater yield compared to CSS without PTC. The exergoeconomic and environmental parameters of the active systems are found more effective related to those of passive systems.
Mariska J De Wildscholten - One of the best experts on this subject based on the ideXlab platform.
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the energy Payback Time of advanced crystalline silicon pv modules in 2020 a prospective study
Progress in Photovoltaics, 2014Co-Authors: Sander A Mann, Mariska J De Wildscholten, Vasilis Fthenakis, W C SinkeAbstract:The photovoltaic (PV) market is experiencing vigorous growth, whereas prices are dropping rapidly. This growth has in large part been possible through public support, deserved for its promise to produce electricity at a low cost to the environment. It is therefore important to monitor and minimize environmental impacts associated with PV technologies. In this work, we forecast the environmental performance of crystalline silicon technologies in 2020, the year in which electricity from PV is anticipated to be competitive with wholesale electricity costs all across Europe. Our forecasts are based on technological scenario development and a prospective life cycle assessment with a thorough uncertainty and sensitivity analysis. We estimate that the energy Payback Time at an in-plane irradiation of 1700 kWh/(m2 year) of crystalline silicon modules can be reduced to below 0.5 years by 2020, which is less than half of the current energy Payback Time.
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energy Payback Time and carbon footprint of commercial photovoltaic systems
Solar Energy Materials and Solar Cells, 2013Co-Authors: Mariska J De WildscholtenAbstract:Abstract Energy Payback Time and carbon footprint of commercial roof-top photovoltaic systems are calculated based on new 2011 manufacturers' data; and on 2013 equipment manufacturers' estimates of “micromorph” silicon photovoltaic modules. The energy Payback Times and carbon footprints are 1.96, 1.24, 1.39, 0.92, 0.68, and 1.02 years and 38.1, 27.2, 34.8, 22.8, 15.8, and 21.4 g CO 2 -eq/kWh for monocrystalline silicon, multicrystalline silicon, amorphous silicon, “micromorph” silicon, cadmium telluride and CIGS roof-top photovoltaic systems, respectively, assuming a poly-silicon production with hydropower; ingot-, wafer-, solar cell and module production with UCTE electricity; an irradiation on an optimized-angle of 1700 kWh/(m 2 ×year); excluding installation, operation and maintenance and end-of-life phase. Shifting production of poly-silicon, ingots, wafers, cells and modules to China results in similar energy Payback Times but increases the carbon footprint by a factor 1.3–2.1, depending on the electricity intensity of manufacturing.
R Eyras - One of the best experts on this subject based on the ideXlab platform.
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energy Payback Time of grid connected pv systems comparison between tracking and fixed systems
Progress in Photovoltaics, 2009Co-Authors: O Perpinan, Manuel Castro, E Lorenzo, R EyrasAbstract:A review of existing studies about life cycle assessment (LCA) of PV systems has been carried out. The data from this review have been completed with our own figures in order to calculate the energy Payback Time (EPBT) of double and horizontal axis tracking and fixed systems. The results of this metric span from 2 to 5 years for the latitude and global irradiation ranges of the geographical area comprised between -10° to 10° of longitude, and 30° to 45° of latitude. With the caution due to the uncertainty of the sources of information, these results mean that a grid connected PV system (GCPVS) is able to produce back the energy required for its existence from 6 to 15 Times during a life cycle of 30 years. When comparing tracking and fixed systems, the great importance of the PV generator makes advisable to dedicate more energy to some components of the system in order to increase the productivity and to obtain a higher performance of the component with the highest energy requirement. Both double axis and horizontal axis trackers follow this way, requiring more energy in metallic structure, foundations and wiring, but this higher contribution is widely compensated by the improved productivity of the system.
Vasilis Fthenakis - One of the best experts on this subject based on the ideXlab platform.
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the energy Payback Time of advanced crystalline silicon pv modules in 2020 a prospective study
Progress in Photovoltaics, 2014Co-Authors: Sander A Mann, Mariska J De Wildscholten, Vasilis Fthenakis, W C SinkeAbstract:The photovoltaic (PV) market is experiencing vigorous growth, whereas prices are dropping rapidly. This growth has in large part been possible through public support, deserved for its promise to produce electricity at a low cost to the environment. It is therefore important to monitor and minimize environmental impacts associated with PV technologies. In this work, we forecast the environmental performance of crystalline silicon technologies in 2020, the year in which electricity from PV is anticipated to be competitive with wholesale electricity costs all across Europe. Our forecasts are based on technological scenario development and a prospective life cycle assessment with a thorough uncertainty and sensitivity analysis. We estimate that the energy Payback Time at an in-plane irradiation of 1700 kWh/(m2 year) of crystalline silicon modules can be reduced to below 0.5 years by 2020, which is less than half of the current energy Payback Time.
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life cycle assessment of cadmium telluride photovoltaic cdte pv systems
Solar Energy, 2014Co-Authors: Vasilis Fthenakis, P SinhaAbstract:In this study, the environmental loads of 100 kWp cadmium telluride photovoltaic (CdTe PV) power generation systems in Malaysia are analyzed using life cycle assessment. The target renewable energy system is made up of CdTe PV panel, a power conditioning system and a balance of system. Life-cycle environmental issues were analyzed using major indicators like global warming potential, fossil fuel consumption, energy Payback Time, and CO2 Payback Time. Then, the results were compared with those of alternative PV systems such as single- and multi-crystalline silicon photovoltaics. The CdTe PV systems presently have a GWP of 15.1 g CO2 equivalent/kW h in Malaysia. The CdTe PV panel is the greatest contributor to global warming potential in the system, accounting for 47.8%. Electricity used in the semiconductor deposition process is the major contributor of GWP in CdTe PV panel. Total fossil fuel consumption is 0.221 MJ/kW h. The CdTe PV panel accounts for 49.3% of the total fossil fuel consumption. Energy Payback Time and CO2 Payback Time are 0.94 years and 0.76 years, respectively, and those are relatively short periods compared with other PV power plants. The energy return on investment of the CdTe PV system was found to be superior to other Si-based PV systems. 2014 Published by Elsevier Ltd.
Jining Chen - One of the best experts on this subject based on the ideXlab platform.
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contributing to differentiated technology policy making on the promotion of energy efficiency technologies in heavy industrial sector a case study of china
Journal of Cleaner Production, 2016Co-Authors: Jining Chen, Huifang LiAbstract:Abstract Promoting energy efficiency technologies (EETs) in heavy industrial sector is a crucial approach for energy conservation worldwide. Due to the existence of various barriers, the diffusion of EETs is often slow and is largely influenced by policy incentives. Insufficient consideration of the heterogeneity of EETs makes the one-size-fits-all policy design scheme ineffective and inefficient in practice. Therefore, this paper analyzes the design of differentiated technology policies to accelerate the promotion of EETs. The analysis is based on technology classification results from a bottom-up technology evaluation system. Technical attributes were qualitatively analyzed and the 130 total technologies were divided into three segments: 76 main production-process technologies (PP), 39 process-integrated resource and energy recycling technologies (RER) and 15 pollution control technologies (PC). Then the 115 PP and RER technologies were quantitatively analyzed by calculating benefit-cost ratio, investment Payback Time and technical penetration. The evaluation results proved that EETs had marked differences in economic efficiency and technical maturity, with dynamic investment Payback Time ranging from 0.3 to 11 years and penetrations ranging from 1% to 80%. Graphing investment Payback Time on a vertical axis and technical penetration on a horizontal axis, the 115 technologies were classified into four quadrants. Features and policy-support demands of those three types of technologies in the four quadrants were discussed and corresponding technology policies were proposed. The thorough technical investigations in this study also provided a complete technological database for policy-making, which was freely offered on the website of China's Ministry of Industry and Information Technology.
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contributing to differentiated technology policy making on the promotion of energy efficiency technologies in heavy industrial sector a case study of china
Journal of Cleaner Production, 2016Co-Authors: Xin Cao, Zongguo Wen, Jining ChenAbstract:Abstract Promoting energy efficiency technologies (EETs) in heavy industrial sector is a crucial approach for energy conservation worldwide. Due to the existence of various barriers, the diffusion of EETs is often slow and is largely influenced by policy incentives. Insufficient consideration of the heterogeneity of EETs makes the one-size-fits-all policy design scheme ineffective and inefficient in practice. Therefore, this paper analyzes the design of differentiated technology policies to accelerate the promotion of EETs. The analysis is based on technology classification results from a bottom-up technology evaluation system. Technical attributes were qualitatively analyzed and the 130 total technologies were divided into three segments: 76 main production-process technologies (PP), 39 process-integrated resource and energy recycling technologies (RER) and 15 pollution control technologies (PC). Then the 115 PP and RER technologies were quantitatively analyzed by calculating benefit-cost ratio, investment Payback Time and technical penetration. The evaluation results proved that EETs had marked differences in economic efficiency and technical maturity, with dynamic investment Payback Time ranging from 0.3 to 11 years and penetrations ranging from 1% to 80%. Graphing investment Payback Time on a vertical axis and technical penetration on a horizontal axis, the 115 technologies were classified into four quadrants. Features and policy-support demands of those three types of technologies in the four quadrants were discussed and corresponding technology policies were proposed. The thorough technical investigations in this study also provided a complete technological database for policy-making, which was freely offered on the website of China's Ministry of Industry and Information Technology.
