GOALI/EFRI-RESTOR Novel Compressed Air Approach for Off Shore Wind Energy Storage

这项研究的重点是开发一种本地化的压缩空气方法，用于存储离岸风力涡轮机的过剩能量，以显著缓解白天的电力供需失衡。在目前的方法中，电力转换前的能量被储存起来，而接近等温运行的高效压缩机/膨胀机直接用于能量储存和提取。这种新颖的方法避免了与多次变换相关的损耗，并允许发电机和传输线大幅缩小尺寸。这种方法缺少的关键技术是高效和高功率密度的气动(空气)压缩机/膨胀机，能够实现非常高的压力比。在这个项目中，压缩机/膨胀机的设计结合了液体活塞的概念和微小水滴的主动喷雾，以实现其传热要求。为了确保在高表面积和高流速下的高效率，将使用纳米结构的表面来减少液体活塞上的摩擦阻力。是否会开发控制方法来优化组件？和整体系统效率。这项研究将在以下各个领域做出基础性贡献：耦合基质介质中的多相对流换热以及液滴和雾化；液体/空气自由表面的动力学；用于减阻的纳米结构表面；利用海水/湖泊水运行的新一代高效风力发电机组；以及复杂系统的最优控制。就更广泛的影响而言，通过允许经济地储存多余的能源，这项研究将显著增加离岸风力涡轮机的可用能源，因为目前可用的经济储存能源选择不可行。这将是朝着美国到2030年利用20%的风能的目标迈出的重要一步。行业合作伙伴的积极参与提高了生产和市场采用的速度。工程系统的重点和研究的跨学科性质将影响本科生和研究生的工程学课程，并将用于培养在解决问题方面具有广泛技能和跨学科视角的新一代工程研究人员和从业者。该项目将在研究、教育和推广方面受益于与美国国家科学基金会紧凑型高效流体动力工程研究中心和明尼苏达大学新成立的能源部资助的风力涡轮机研究联盟的密切合作。2010财年EFRI-Restor主题支持该项目由美国国家科学基金会(NSF)工程(ENG)、数学和物理科学(MPS)和社会、行为和经济科学(SBE)以及计算机和信息科学与工程与美国能源部(DOE)合作赞助。

The research is focused on developing a localized compressed air approach for storing excess energy from off-shore wind turbines to dramatically alleviate power supply and demand imbalances during the day. In the current approach, the energy prior to electricity conversion is stored, and an efficient compressor/expander that operates nearly isothermally is used directly for energy storage and extraction. This novel approach avoids losses associated with multiple conversions and allows the electrical generator and the transmission lines to be substantially down-sized. The key missing enabling technology for this approach is an efficient and power dense pneumatic (air) compressor/expander capable of very high pressure ratios. In this project this compressor/expander design combines a liquid piston concept and the active spraying of tiny water droplets to achieve its heat transfer requirements. To ensure high efficiency in the presence of high surface areas and flow velocities, a nanotextured surface will be employed to reduce the frictional drag on the liquid piston. Control methodology will be developed to optimize components? and overall system efficiencies. The research will make fundamental contributions to these individual fields such as: multiphase convective heat transfer in a coupled matrix media and with droplets and mist; dynamics of liquid/air free surface; nanotextured surfaces for drag reduction; a new generation of efficient wind turbine power generators that operate with sea / lake water; and optimal control of complex systems. In terms of the broader impacts, by allowing economical storage of excess energy, the research will significantly increase the energy available from off-shore wind turbines where currently available economical options for energy storage are not feasible. This will be a major step towards the US goal of deriving 20% energy from wind by 2030. Active participation by the industry partner enhances the pace of production and market adoption. The engineering system focus and interdisciplinary nature of the research will impact undergraduate and graduate engineering curriculum and will be employed in the education of a new generation of engineering researchers and practitioners with broad skill and interdisciplinary perspectives on problem solving. This project will benefit, in research, education and outreach, from close collaboration with the NSF Engineering Research Center for Compact and Efficient Fluid Power and the newly formed DOE funded Wind Turbine Research Consortium at the University of Minnesota.The FY 2010 EFRI-RESTOR Topic that supports this project was sponsored by the US National Science Foundation (NSF) Directorates for Engineering (ENG), Mathematical and Physical Sciences (MPS) and Social, Behavioral and Economic Sciences (SBE), and Computer & Information Science and Engineering in collaboration with the US Department of Energy (DOE).