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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Numerical modeling and experimental validation of a phase change material-based compact cascade cooling system for enhanced thermal management
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Numerical modeling and experimental validation of a phase change material-based compact cascade cooling system for enhanced thermal management

机译：基于相变材料的紧凑型级联冷却系统的数值模拟与实验验证，用于增强热管理

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摘要

The thermal performance of phase change material (PCM)-based compact cascade cooling systems with an integrated heat sink was experimentally evaluated using heat-transfer measurements under constant heat flux. Numerical calculations were also performed to investigate the fundamental mechanism of the cascade cooling approach using multiple PCMs (i.e., paraffin wax) with different melting points. This structure facilitated cooling via hierarchical heat exchange without additional energy consumption. The experimental results of the cascade cooling system demonstrated that the peak temperature within a fin decreased from 123.4 to 107.2 degrees C in one heat-supply cycle owing to the latent heat adsorption during a phase change in the PCMs. Particularly, the cascade cooling system reduced the peak temperature by approximately 13.1% compared with natural convection in air. In addition, the time taken to reach the maximum allowed temperature from the peak temperature was decreased by 45.0% because of the larger heat capacity and cascading heat exchange of PCMs. This implies that the lifetime of a system can be increased and failure can be prevented. Improved thermal performance was demonstrated after repetitive heating-cooling cycles. Furthermore, it was numerically demonstrated that a PCM nanocomposite can reduce the heat accumulation because of the low thermal conductivities of PCMs.
机译：通过在恒定热通量下通过传热测量进行实验评估相变材料（PCM）的热性能 - 基于具有集成散热器的紧凑型级联冷却系统。还进行了数值计算，以研究使用不同熔点的多种PCMS（即石蜡）的级联冷却方法的基本机制。这种结构通过分层热交换促进冷却而无需额外的能量消耗。级联冷却系统的实验结果表明，由于在PCMS中的相变期间，在一个热源循环中，翅片内的峰值温度在一个热量供应循环中从123.4到107.2摄氏度下降。特别地，与空气中的自然对流相比，级联冷却系统将峰值温度降低约13.1％。此外，由于较大的热量和PCM的级联热交换，达到峰值温度从峰值温度达到最大温度的时间降低了45.0％。这意味着可以增加系统的寿命并且可以防止失败。在重复的加热冷却循环之后，证明了改善的热性能。此外，在数值上证明PCM纳米复合材料可以减少由于PCM的低导电性的热量积累。

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