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首页> 外文会议>11th fuel cell science, engineering, and technology conference 2013 >EXERGOGRAVIMETRIC DESIGN FOR INCREASED SOFC SYSTEM POWER DENSITY
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EXERGOGRAVIMETRIC DESIGN FOR INCREASED SOFC SYSTEM POWER DENSITY

机译：用于增加SOFC系统功率密度的引力计设计

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Compact subsystems are pivotal to aeronautical applications, inclusive of advanced energy concepts. Regarding size minimization, an "exergogravimetric" approach has recently begun that attempts an exergy-aided weight reduction of advanced energy systems (inclusive of fuel); and this is based upon the added design insights afforded by Second Law considerations. The chief rationale and objective are to leverage the advancements that exergoeconomics affords in the realm of cost-effective thermal system design to aid size-effective thermal system design. A conceptual solid oxide fuel cell (SOFC) system for long-duration unmanned aerial vehicle (UAV) applications has been initially modeled and simulated, inclusive of exergy analysis, and preliminary findings are discussed. Additionally, the concepts and methodologies can be extended to other advanced energy system technologies. There are project-specific and general milestones and conclusions drawn from the initial investigation. Specific to the project, a conceptual SOFC system simulation was completed via physics-based and literature-verified models along with structured language (i.e., MATLAB) numerical implementation. Specific component-level contributions to lost power potential and added mass were preliminarily resolved. Thermal exergy destruction and loss are predominant sources of unutilized specific power potential. Operational and physical degrees-of-freedom were explored, with the aid of exergy analysis, to resolve better design pathways. This included a counterintuitive preliminary finding that larger cell interconnects may facilitate smaller and more efficient system operation. Generally, exergy analyses allow a system design opportunity to gain higher resolution insights (i.e., to component- and spatial- extents) regarding inefficiencies throughout a thermal system, and this is afforded by the comprising blend of 1st Law and 2nd Law considerations. There is also an added means of accounting for 2nd Law effects. The traditional 2nd Law verification point of entropy generation being non-negative does not provide the same level of process analysis closure as does the related constraint that all processes have to account for exergy being stored, converted, destroyed or rejected through any defined control volume. This alternative 2nd Law perspective facilitates verification and validation of simulations.
机译：紧凑的子系统对于航空应用至关重要，包括先进的能源概念。关于尺寸最小化，最近开始采用“引力重量”方法，试图以火力辅助减轻先进能源系统（包括燃料）的重量。这是基于第二定律考虑因素提供的更多设计见解。主要原理和目标是利用能效经济学在经济高效的热力系统设计领域中所提供的进步来辅助尺寸有效的热力系统设计。最初已经对用于长期无人机（UAV）应用的概念性固体氧化物燃料电池（SOFC）系统进行了建模和仿真，包括火用分析，并讨论了初步发现。另外，这些概念和方法可以扩展到其他先进的能源系统技术。从最初的调查中可以得出针对特定项目和总体的里程碑和结论。针对该项目，通过基于物理学和经过文献验证的模型以及结构化语言（即MATLAB）数值实现，完成了概念上的SOFC系统仿真。初步解决了组件级对功率损失和增加质量的贡献。火用热能的破坏和损失是未利用的特定电势的主要来源。在火用分析的帮助下，探索了操作和物理自由度，以解决更好的设计途径。这包括一个违反直觉的初步发现，即较大的单元互连可以促进更小和更有效的系统操作。通常，火用分析允许系统设计机会获得有关整个热系统效率低下的更高分辨率的见解（即，在组件和空间范围内），这是第一定律和第二定律考虑因素的综合体现。还有第二种法律效力的会计核算方法。熵生成的传统第二定律验证点为非负值，其提供的过程分析闭包程度与相关约束相同，即所有过程都必须考虑通过任何定义的控制量来存储，转换，破坏或拒绝的火用过程。第二法的这种替代观点有助于仿真的验证和确认。

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