Numerical studies of co-axial travelling-wave thermoacoustic cooler powered by standing-wave thermoacoustic engine
Numerical studies of co-axial travelling-wave thermoacoustic cooler powered by standing-wave thermoacoustic engine
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DOI：
10.1016/j.renene.2019.02.059
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发表时间：
2019-08
期刊：
影响因子：
8.7
通讯作者：
P. Saechan;A. Jaworski
中科院分区：
文献类型：
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作者：
P. Saechan;A. Jaworski
基于线性热声理论，对驻波热声发动机驱动的同轴行波热声制冷器进行了设计和优化。目标应用是在无法接入电网的发展中国家农村社区储存医疗用品，在那里烹饪产生的余热可用作能源投入。该设计以施工简单、成本低为指导思想。因此，SWTE/TWTC耦合被封闭在恒径谐振器中，该谐振器适应紧凑的TWTC的同轴配置。根据前期实验，工质为10 巴的空气，工作频率为50 赫兹。参数，如冷却器的横截面面积与反馈惯性的比率，以及堆栈和回热器的几何形状，都经过了优化，以实现最大的系统效率。在目标输入功率为600 W时，可获得7.75%的驱动比，在250 K下的制冷负载为133 W，相当于单壁波导的热声效率为17%，行波导管的COP为1.9，综合效率为22.2%。这些模拟是为了给所提议的设备的增强原型的构建提供信息。文中提供了有关实际构建的详细讨论和指导原则。
Design and optimisation of a co-axial travelling-wave thermoacoustic cooler (TWTC) powered by a standing-wave thermoacoustic engine (SWTE) is conducted based on the linear thermoacoustic theory. The target application is storage of medical supplies in rural communities of developing countries with no access to electricity grid, where waste heat from cooking can be used as energy input. The design is guided by construction simplicity and low cost. Thus the SWTE/TWTC coupling is enclosed in a constant-diameter resonator which accommodates a compact co-axial configuration of the TWTC. Following earlier experiments, working fluid is air at 10 bar, and operating frequency is 50 Hz. Parameters such as the ratio of the cross-sectional area of the cooler to feedback inertance and stack and regenerator geometries, have been optimised for maximum system efficiency. Here, at the target input power of 600 W a drive ratio of 7.75% can be obtained, leading to the cooling load of 133 W at 250 K. This corresponds to the SWTE thermal-to-acoustic efficiency of 17% and TWTC COP of 1.9, and the combined efficiency of 22.2%. The simulations are to inform the build of an enhanced prototype of the proposed device. A detailed discussion and guidelines for practical builds are provided.