The Experts below are selected from a list of 1701 Experts worldwide ranked by ideXlab platform
Haoran Xu - One of the best experts on this subject based on the ideXlab platform.
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performance improvement of a direct carbon solid oxide fuel cell through integrating an Otto heat Engine
Energy Conversion and Management, 2018Co-Authors: Haoran Xu, Bin Chen, Houcheng Zhang, Jinliang Yuan, John T S Irvine, Meng NiAbstract:Abstract A novel system consisting of an external heat source, a direct carbon solid oxide fuel cell (DC-SOFC), a regenerator and an air standard Otto Cycle Engine is proposed to improve the performance of the DC-SOFC. Considering the electrochemical/chemical reactions, ionic/electronic charge transport, mass/momentum transport and heat transfer, a 2D tubular DC-SOFC model shows that the overall heat released in the cell can be smaller than, equal to or larger than the heat required by the internal Boudouard reaction. Three different operating modes of the proposed system are identified, and accordingly, analytical expressions for the equivalent power output and efficiency of the proposed system are derived under different operating conditions. The modeling results show that the Otto heat Engine can effectively recover the waste heat from the DC-SOFC for additional power production especially at large operating current density. Comprehensive parametric studies are conducted to investigate the effects of the different operating conditions of DC-SOFC on its performance and heat generation. The effects of compression ratio, internal irreversibility factor and power dissipation of the Otto heat Engine on the system performance improvement are also studied.
Meng Ni - One of the best experts on this subject based on the ideXlab platform.
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performance improvement of a direct carbon solid oxide fuel cell through integrating an Otto heat Engine
Energy Conversion and Management, 2018Co-Authors: Haoran Xu, Bin Chen, Houcheng Zhang, Jinliang Yuan, John T S Irvine, Meng NiAbstract:Abstract A novel system consisting of an external heat source, a direct carbon solid oxide fuel cell (DC-SOFC), a regenerator and an air standard Otto Cycle Engine is proposed to improve the performance of the DC-SOFC. Considering the electrochemical/chemical reactions, ionic/electronic charge transport, mass/momentum transport and heat transfer, a 2D tubular DC-SOFC model shows that the overall heat released in the cell can be smaller than, equal to or larger than the heat required by the internal Boudouard reaction. Three different operating modes of the proposed system are identified, and accordingly, analytical expressions for the equivalent power output and efficiency of the proposed system are derived under different operating conditions. The modeling results show that the Otto heat Engine can effectively recover the waste heat from the DC-SOFC for additional power production especially at large operating current density. Comprehensive parametric studies are conducted to investigate the effects of the different operating conditions of DC-SOFC on its performance and heat generation. The effects of compression ratio, internal irreversibility factor and power dissipation of the Otto heat Engine on the system performance improvement are also studied.
Houcheng Zhang - One of the best experts on this subject based on the ideXlab platform.
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performance improvement of a direct carbon solid oxide fuel cell through integrating an Otto heat Engine
Energy Conversion and Management, 2018Co-Authors: Haoran Xu, Bin Chen, Houcheng Zhang, Jinliang Yuan, John T S Irvine, Meng NiAbstract:Abstract A novel system consisting of an external heat source, a direct carbon solid oxide fuel cell (DC-SOFC), a regenerator and an air standard Otto Cycle Engine is proposed to improve the performance of the DC-SOFC. Considering the electrochemical/chemical reactions, ionic/electronic charge transport, mass/momentum transport and heat transfer, a 2D tubular DC-SOFC model shows that the overall heat released in the cell can be smaller than, equal to or larger than the heat required by the internal Boudouard reaction. Three different operating modes of the proposed system are identified, and accordingly, analytical expressions for the equivalent power output and efficiency of the proposed system are derived under different operating conditions. The modeling results show that the Otto heat Engine can effectively recover the waste heat from the DC-SOFC for additional power production especially at large operating current density. Comprehensive parametric studies are conducted to investigate the effects of the different operating conditions of DC-SOFC on its performance and heat generation. The effects of compression ratio, internal irreversibility factor and power dissipation of the Otto heat Engine on the system performance improvement are also studied.
Michel Feidt - One of the best experts on this subject based on the ideXlab platform.
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Designing a powered combined Otto and Stirling Cycle power plant through multi-objective optimization approach
Renewable and Sustainable Energy Reviews, 2016Co-Authors: Mohammad H. Ahmadi, Hadi Hosseinzade, Emin Acikkalp, Fathollah Pourfayaz, Iskander Tlili, Mohammad Ali Ahmadi, Michel FeidtAbstract:Throughout the recent years, several efforts have been conducted in studying Stirling Engine which have yielded various models for analysis of Stirling Engine thermal efficiency and output power. In the present study, the applicability of a combined Stirling and Otto Cycle power plant where a Stirling Cycle Engine would serve as a bOttoming Cycle for a stationary Otto Cycle Engine is investigated. Output power of Stirling Engine and Stirling Engine thermal efficiency are optimized and total pressure losses of Stirling Engine is optimized executing NSGA approach and finite speed thermodynamic analysis. The outcomes gained are satisfactory verified versus actual recorded data of Stirling Engine. Decision making was performed via three well-known methods. Finally, error analysis was performed on the outputs obtained from this optimization.
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validation of a simulation model for a combined Otto and stirling Cycle power plant
ASME 2010 4th International Conference on Energy Sustainability Volume 2, 2010Co-Authors: Jim Mcgovern, Michel Feidt, Barry Cullen, Stoian PetrescuAbstract:A project has been underway at the Dublin Institute of Technology (DIT) to investigate the feasibility of a combined Otto and Stirling Cycle power plant in which a Stirling Cycle Engine would serve as a bOttoming Cycle for a stationary Otto Cycle Engine. This type of combined Cycle plant is considered to have good potential for industrial use. This paper describes work by DIT and collaborators to validate a computer simulation model of the combined Cycle plant. In investigating the feasibility of the type of combined Cycle that is proposed there are a range of practical realities to be faced and addressed. Reliable performance data for the component Engines are required over a wide range of operating conditions, but there are practical difficulties in accessing such data. A simulation model is required that is sufficiently detailed to represent all important performance aspects and that is capable of being validated. Thermodynamicists currently employ a diverse range of modeling, analysis and optimization techniques for the component Engines and the combined Cycle. These techniques include traditional component and process simulation, exergy analysis, entropy generation minimization, exergoeconomics, finite time thermodynamics and finite dimensional optimization thermodynamics methodology (FDOT). In the context outlined, the purpose of the present paper is to come up with a practical validation of a practical computer simulation model of the proposed combined Otto and Stirling Cycle Power Plant.Copyright © 2010 by ASME
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preliminary modelling results for an Otto Cycle stirling Cycle hybrid Engine based power generation system
2009Co-Authors: Barry Cullen, Michel Feidt, Jim Mcgovern, Stoian PetrescuAbstract:Abstract This paper presents preliminary data and results for a system mathematical model for a proposed Otto Cycle / Stirling Cycle hybrid-Engine-based power generation system. The system is a combined Cycle system with the Stirling Cycle machine operating as a bOttoming Cycle on the Otto Cycle exhaust. The application considered is that of a stationary power generation scenario wherein the Stirling Cycle Engine operates as a waste heat recovery device on the exhaust stream of the Otto Cycle Engine. This paper is primarily concerned with the development of a model for a suitable Stirling Cycle Engine capable of running on the high grade thermal energy present in the exhaust stream of the industrial Otto Cycle Engine under consideration. The Otto Cycle Engine is not modelled, with the relevant Engine exhaust and performance parameters taken from published data. This was deemed a suitable step as the Otto Cycle Engine is an established technology and the Engines on which the model is to be based are commercially available. Therefore use of the published data in this manner was favourable as it limited the extent of the model required and allowed focus on the Stirling Cycle Engine requirements. The modelling procedure for the Stirling Engine follows the traditional sequence of Zero Order, First Order, Second Order as suggested in the classical literature. Zero Order analysis is completed in the form of the Beale analysis, First Order analysis utilises a Schmidt style method while the Second Order analysis utilises the Direct Method model. Modelling is based on data available for an industrial Otto Engine system operating on natural gas, with the input variables being specified as the exhaust recoverable energy content and temperature at a constant speed of 1500rpm.
John T S Irvine - One of the best experts on this subject based on the ideXlab platform.
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performance improvement of a direct carbon solid oxide fuel cell through integrating an Otto heat Engine
Energy Conversion and Management, 2018Co-Authors: Haoran Xu, Bin Chen, Houcheng Zhang, Jinliang Yuan, John T S Irvine, Meng NiAbstract:Abstract A novel system consisting of an external heat source, a direct carbon solid oxide fuel cell (DC-SOFC), a regenerator and an air standard Otto Cycle Engine is proposed to improve the performance of the DC-SOFC. Considering the electrochemical/chemical reactions, ionic/electronic charge transport, mass/momentum transport and heat transfer, a 2D tubular DC-SOFC model shows that the overall heat released in the cell can be smaller than, equal to or larger than the heat required by the internal Boudouard reaction. Three different operating modes of the proposed system are identified, and accordingly, analytical expressions for the equivalent power output and efficiency of the proposed system are derived under different operating conditions. The modeling results show that the Otto heat Engine can effectively recover the waste heat from the DC-SOFC for additional power production especially at large operating current density. Comprehensive parametric studies are conducted to investigate the effects of the different operating conditions of DC-SOFC on its performance and heat generation. The effects of compression ratio, internal irreversibility factor and power dissipation of the Otto heat Engine on the system performance improvement are also studied.
