Development of an advanced free-piston Stirling engine for micro combined heating and power application
Development of an advanced free-piston Stirling engine for micro combined heating and power application
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DOI：
10.1016/j.apenergy.2018.11.036
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发表时间：
2019-02
期刊：
影响因子：
11.2
通讯作者：
Songgang Qiu;Yuan Gao;G. Rinker;Koji Yanaga
中科院分区：
文献类型：
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作者：
Songgang Qiu;Yuan Gao;G. Rinker;Koji Yanaga
热电联产(CHP)系统在满足能源需求和减少发电对环境的影响方面发挥着重要作用。近年来，自由活塞式斯特林发动机(FPSE)作为一种很有前途的热电联产技术，以其高效、可靠、运行安静等特点备受关注。在这项研究中，开发了一个与FPSE集成的概念性CHP系统。为了减少浮式除尘器内的流动分离和热损失，设计了压力容器、换热器和新型箔式回热器的一体化总成。为了实现这种集成设计，采用了加法制造来制造这些关键部件，在降低制造成本的同时消除了传统制造方法的设计限制，从而提高了整体的FPSE效率。采用有限元分析和计算流体力学相结合的方法，确定了最佳的流量分配和发动机结构。对置换器总成进行了动力学和摇摆振型分析。利用Sage软件对斯特林发动机进行了一维热力学建模，对系统性能进行了估算。结果表明，该热电联产系统在80 °C时可提供1 kW的电能和1.1 kW的热能，燃料电效率接近38%。因此，基于热电联产的热电联产系统比其他热电联产系统具有更高的效率和性价比，适合于为住宅提供电力和供热。
Combined heat and power (CHP) systems play an important role in meeting energy requirements and reducing the environmental impact of power generation. Recently, free-piston Stirling engines (FPSE) have attracted much attention as a promising CHP technology due to the characteristics such as high efficiency, high reliability, and quiet operation. In this study, a conceptual CHP system integrated with a FPSE was developed. In order to reduce flow separation and thermal losses in the FPSE, an integrated assembly of the pressure vessel, heat exchangers, and new foil type regenerator was designed. To achieve this integrated design, additive manufacturing was used to fabricate these key components and improve the overall FPSE efficiency by removing the design limitation of traditional fabrication methods while decreasing manufacturing cost. Finite element analysis and computational fluid dynamics were conducted to determine the optimal flow distribution and engine structure. Dynamic and rocking mode analyses of displacer assembly were performed. One dimensional thermodynamic modeling of the Stirling engine using Sage software was performed to estimate the system performance. The results indicated that the CHP system could provide 1 kWeelectrical power at nearly 38% fuel to electricity efficiency and 1.1 kW of thermal energy at 80 °C. The mapping results of the FPSE show that it has excellent partial power efficiency. Thus, it is concluded that the CHP system based on a FPSE is much more efficient and cost-effective than other CHP system designs and is suitable to provide electrical power and heat for residential applications.