The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Bruce E Logan - One of the best experts on this subject based on the ideXlab platform.
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improved Electrical Power Production of thermally regenerative batteries using a poly phenylene oxide based anion exchange membrane
Journal of Power Sources, 2017Co-Authors: Mohammad Rahimi, Michael A Hickner, Kelly L Kowalski, Christopher A Gorski, Bruce E LoganAbstract:Abstract Thermally regenerative ammonia-based batteries (TRABs) can be used to harvest low-grade waste heat as Electrical Power. To improve TRAB performance, a series of benzyltrimethyl quaternary ammonium-functionalized poly(phenylene oxide) anion exchange membranes (BTMA-AEMs) were examined for their impact on performance relative to a commercial AEM (Selemion AMV). The synthesized AEMs had different degrees of functionalization (DF; 25% and 40%), and thicknesses (50, 100 and 150 μm). Power and energy densities were shown to be a function of both DF and membrane thickness. The Power density of TRAB increased by 31% using a BTMA-AEM (40% DF, 50 μm thick; 106 ± 7 W m −2 ) compared to the Selemion (81 ± 5 W m −2 ). Moreover, the energy density increased by 13% when using a BTMA-based membrane (25% DF, 150 μm thick; 350 Wh m −3 ) compared to the Selemion membrane (311 Wh m −3 ). The thermal-electric conversion efficiency improved to 0.97% with the new membrane compared to 0.86% for the Selemion. This energy recovery was 7.0% relative to the Carnot efficiency, which was 1.8 times greater than the highest previously reported value of a system used to capture low-grade waste heat as electricity.
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Electrical Power Production from low-grade waste heat using a thermally regenerative ethylenediamine battery
Journal of Power Sources, 2017Co-Authors: Mohammad Rahimi, Christopher A Gorski, Adriana D'angelo, Onofrio Scialdone, Bruce E LoganAbstract:Abstract Thermally regenerative ammonia-based batteries (TRABs) have been developed to harvest low-grade waste heat as electricity. To improve the Power Production and anodic coulombic efficiency, the use of ethylenediamine as an alternative ligand to ammonia was explored here. The Power density of the ethylenediamine-based battery (TRENB) was 85 ± 3 W m−2-electrode area with 2 M ethylenediamine, and 119 ± 4 W m−2 with 3 M ethylenediamine. This Power density was 68% higher than that of TRAB. The energy density was 478 Wh m−3-anolyte, which was ∼50% higher than that produced by TRAB. The anodic coulombic efficiency of the TRENB was 77 ± 2%, which was more than twice that obtained using ammonia in a TRAB (35%). The higher anodic efficiency reduced the difference between the anode dissolution and cathode deposition rates, resulting in a process more suitable for closed loop operation. The thermal-electric efficiency based on ethylenediamine separation using waste heat was estimated to be 0.52%, which was lower than that of TRAB (0.86%), mainly due to the more complex separation process. However, this energy recovery could likely be improved through optimization of the ethylenediamine separation process.
Mohammad Rahimi - One of the best experts on this subject based on the ideXlab platform.
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improved Electrical Power Production of thermally regenerative batteries using a poly phenylene oxide based anion exchange membrane
Journal of Power Sources, 2017Co-Authors: Mohammad Rahimi, Michael A Hickner, Kelly L Kowalski, Christopher A Gorski, Bruce E LoganAbstract:Abstract Thermally regenerative ammonia-based batteries (TRABs) can be used to harvest low-grade waste heat as Electrical Power. To improve TRAB performance, a series of benzyltrimethyl quaternary ammonium-functionalized poly(phenylene oxide) anion exchange membranes (BTMA-AEMs) were examined for their impact on performance relative to a commercial AEM (Selemion AMV). The synthesized AEMs had different degrees of functionalization (DF; 25% and 40%), and thicknesses (50, 100 and 150 μm). Power and energy densities were shown to be a function of both DF and membrane thickness. The Power density of TRAB increased by 31% using a BTMA-AEM (40% DF, 50 μm thick; 106 ± 7 W m −2 ) compared to the Selemion (81 ± 5 W m −2 ). Moreover, the energy density increased by 13% when using a BTMA-based membrane (25% DF, 150 μm thick; 350 Wh m −3 ) compared to the Selemion membrane (311 Wh m −3 ). The thermal-electric conversion efficiency improved to 0.97% with the new membrane compared to 0.86% for the Selemion. This energy recovery was 7.0% relative to the Carnot efficiency, which was 1.8 times greater than the highest previously reported value of a system used to capture low-grade waste heat as electricity.
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Electrical Power Production from low-grade waste heat using a thermally regenerative ethylenediamine battery
Journal of Power Sources, 2017Co-Authors: Mohammad Rahimi, Christopher A Gorski, Adriana D'angelo, Onofrio Scialdone, Bruce E LoganAbstract:Abstract Thermally regenerative ammonia-based batteries (TRABs) have been developed to harvest low-grade waste heat as electricity. To improve the Power Production and anodic coulombic efficiency, the use of ethylenediamine as an alternative ligand to ammonia was explored here. The Power density of the ethylenediamine-based battery (TRENB) was 85 ± 3 W m−2-electrode area with 2 M ethylenediamine, and 119 ± 4 W m−2 with 3 M ethylenediamine. This Power density was 68% higher than that of TRAB. The energy density was 478 Wh m−3-anolyte, which was ∼50% higher than that produced by TRAB. The anodic coulombic efficiency of the TRENB was 77 ± 2%, which was more than twice that obtained using ammonia in a TRAB (35%). The higher anodic efficiency reduced the difference between the anode dissolution and cathode deposition rates, resulting in a process more suitable for closed loop operation. The thermal-electric efficiency based on ethylenediamine separation using waste heat was estimated to be 0.52%, which was lower than that of TRAB (0.86%), mainly due to the more complex separation process. However, this energy recovery could likely be improved through optimization of the ethylenediamine separation process.
Manuel Alcázar-ortega - One of the best experts on this subject based on the ideXlab platform.
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Wind farm Electrical Power Production model for load flow analysis
Renewable Energy, 2011Co-Authors: Isidoro Segura-heras, Guillermo Escrivá-escrivá, Manuel Alcázar-ortegaAbstract:Abstract The importance of renewable energy increases in activities relating to new forms of managing and operating Electrical Power: especially wind Power. Wind generation is increasing its share in the electricity generation portfolios of many countries. Wind Power Production in Spain has doubled over the past four years and has reached 20 GW. One of the greatest problems facing wind farms is that the Electrical Power generated depends on the variable characteristics of the wind. To become competitive in a liberalized market, the reliability of wind energy must be guaranteed. Good local wind forecasts are therefore essential for the accurate prediction of generation levels for each moment of the day. This paper proposes an Electrical Power Production model for wind farms based on a new method that produces correlated wind speeds for various wind farms. This method enables a reliable evaluation of the impact of new wind farms on the high-voltage distribution grid.
Chuntian Cheng - One of the best experts on this subject based on the ideXlab platform.
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optimizing Electrical Power Production of hydroPower system by uniform progressive optimality algorithm based on two stage search mechanism and uniform design
Journal of Cleaner Production, 2018Co-Authors: Zhongkai Feng, Wenjing Niu, Chuntian ChengAbstract:Abstract As one of the important renewable energy, hydroPower is experiencing a booming development period throughout the world in recent years. By the end of 2016, hydroPower has occupied 20.1% installed capacity and 19.5% generation in China. Thus, it is of great importance to develop some effective methods to guarantee the overall generation benefit of hydroPower system. As a famous optimization tool to solve this problem, the progressive optimality algorithm cannot effectively handle with large-scale hydroPower system because its computational burden grows exponentially with the increasing number of hydroplants. Thus, in order to effectively alleviate the dimensionality problem, a novel method called uniform progressive optimality algorithm is introduced here. In the presented method, the complex multistage problem is firstly divided into several two-stage optimization subproblems, and then the uniform design is adopted to sample a small subset from all the possible state vectors at each subproblem, while the successive approximation strategy is adopted to gradually improve the quality of solution. The results from a real-world hydroPower system of China indicate that compared with progressive optimality algorithm, the proposed method has superior performance in execution efficiency and convergence speed, which is an effective alternative method for the complex hydroPower system operation problem.
Christopher A Gorski - One of the best experts on this subject based on the ideXlab platform.
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improved Electrical Power Production of thermally regenerative batteries using a poly phenylene oxide based anion exchange membrane
Journal of Power Sources, 2017Co-Authors: Mohammad Rahimi, Michael A Hickner, Kelly L Kowalski, Christopher A Gorski, Bruce E LoganAbstract:Abstract Thermally regenerative ammonia-based batteries (TRABs) can be used to harvest low-grade waste heat as Electrical Power. To improve TRAB performance, a series of benzyltrimethyl quaternary ammonium-functionalized poly(phenylene oxide) anion exchange membranes (BTMA-AEMs) were examined for their impact on performance relative to a commercial AEM (Selemion AMV). The synthesized AEMs had different degrees of functionalization (DF; 25% and 40%), and thicknesses (50, 100 and 150 μm). Power and energy densities were shown to be a function of both DF and membrane thickness. The Power density of TRAB increased by 31% using a BTMA-AEM (40% DF, 50 μm thick; 106 ± 7 W m −2 ) compared to the Selemion (81 ± 5 W m −2 ). Moreover, the energy density increased by 13% when using a BTMA-based membrane (25% DF, 150 μm thick; 350 Wh m −3 ) compared to the Selemion membrane (311 Wh m −3 ). The thermal-electric conversion efficiency improved to 0.97% with the new membrane compared to 0.86% for the Selemion. This energy recovery was 7.0% relative to the Carnot efficiency, which was 1.8 times greater than the highest previously reported value of a system used to capture low-grade waste heat as electricity.
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Electrical Power Production from low-grade waste heat using a thermally regenerative ethylenediamine battery
Journal of Power Sources, 2017Co-Authors: Mohammad Rahimi, Christopher A Gorski, Adriana D'angelo, Onofrio Scialdone, Bruce E LoganAbstract:Abstract Thermally regenerative ammonia-based batteries (TRABs) have been developed to harvest low-grade waste heat as electricity. To improve the Power Production and anodic coulombic efficiency, the use of ethylenediamine as an alternative ligand to ammonia was explored here. The Power density of the ethylenediamine-based battery (TRENB) was 85 ± 3 W m−2-electrode area with 2 M ethylenediamine, and 119 ± 4 W m−2 with 3 M ethylenediamine. This Power density was 68% higher than that of TRAB. The energy density was 478 Wh m−3-anolyte, which was ∼50% higher than that produced by TRAB. The anodic coulombic efficiency of the TRENB was 77 ± 2%, which was more than twice that obtained using ammonia in a TRAB (35%). The higher anodic efficiency reduced the difference between the anode dissolution and cathode deposition rates, resulting in a process more suitable for closed loop operation. The thermal-electric efficiency based on ethylenediamine separation using waste heat was estimated to be 0.52%, which was lower than that of TRAB (0.86%), mainly due to the more complex separation process. However, this energy recovery could likely be improved through optimization of the ethylenediamine separation process.