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Optimization of cyclical supercooling in the multi-stage system of a thermoelectric cooler
参考中译:热电制冷器多级系统循环过冷度的优化


          

刊名：Applied Thermal Engineering
作者：Ryszard Buchalik（Department of Power Engineering and Turbomachinery, Silesian University of Technology）
Grzegorz Nowak（Department of Power Engineering and Turbomachinery, Silesian University of Technology）
刊号：725C0058
ISSN：1359-4311
出版年：2023
年卷期：2023, vol.228
页码：120438-1--120438-22
总页数：22
分类号：TK12
关键词：Thermoelectric cooler；Supercooling；Pulsatory operation；Electric current shaping
参考中译：热电制冷器；过冷；脉动运行；电流整形
语种：eng
文摘：The paper deals with issues related to the optimization of pulse supply of thermoelectric cooling systems to obtain possibly low temperatures, below the minimum steady-state temperature. The pulse shape was optimized with a view to minimizing the period between its successive repetitions to achieve the set cyclic effect of supercooling. An analysis was conducted of the way of the current pulse modelling using three different methods. It was observed that its definition using 3 degrees of freedom was a good compromise between the achieved results and the computational cost. The calculations were carried out for a one- and a two-stage system taking account of the thermal capacity of the heat reservoirs. An analysis was also carried out of the impact of the thermal capacity of individual reservoirs on the optimization results. The notions of the limit temperature and of the limit period defining the rationality threshold of further reduction of the supercooling temperature were introduced. The optimization process was run for two variants of computations, i.e. firstly to minimize the period between subsequent supercooling temperature occurrence, and secondly to maximize the supplied cooling power at supercooling temperature range. It was demonstrated that in the case of the assumed two-stage system, it was possible to maximally reduce the cold reservoir temperature by over 6 K at the working cycle of about 13 min. Diagrams of supercooling temperature as a function of the minimum period were presented. Smaller supercooling values but with shorter periods are obtained for one-stage systems. Pulse supply also produces the benefit of obtaining cooling power at temperatures below the steady-state minimum and close to it.
参考中译：本文讨论了热电制冷系统的脉冲电源的优化问题，以获得尽可能低的温度，低于最低稳态温度。为了达到设定的过冷循环效果，对脉冲形状进行了优化，使其连续重复的周期最小。用三种不同的方法对电流脉冲建模方法进行了分析。据观察，使用3个自由度的定义是在取得的结果和计算成本之间的一个很好的折衷。计算是针对一个单级系统和一个两级系统进行的，其中考虑了热源的热容量。分析了各水库的热容量对优化结果的影响。引入了极限温度和极限周期的概念，定义了进一步降低过冷度的合理阈值。优化过程用于两种不同的计算，即第一种是最小化后续过冷温度发生之间的时间间隔，第二种是在过冷温度范围内最大化所提供的冷却功率。结果表明，在假定的两级系统的情况下，在13min左右的工作循环下，冷库温度最大可能降低6K以上。给出了过冷温度与最小周期的关系图。对于单级系统，得到了较小的过冷值，但周期较短。脉冲电源还可以在低于或接近稳态最低温度的情况下获得冷却功率。



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