A novel thermoelectric harvester based on high-performance phase change material for space application
A novel thermoelectric harvester based on high-performance phase change material for space application
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DOI：
10.1016/j.apenergy.2017.10.030
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发表时间：
2017-11
期刊：
影响因子：
11.2
通讯作者：
Y. Tu;Wei Zhu;T. Lu;Yuan Deng
中科院分区：
文献类型：
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作者：
Y. Tu;Wei Zhu;T. Lu;Yuan Deng
在这项研究中，提出了一种适用于空间应用的极大温度变化（从+100 ° C到-50 ° C）的热电能量收集装置，该装置使用相变材料（PCM）进行热控制和储存。为了开发一种高性能的相变材料用于该装置的储热单元（HSU），研究了不同膨胀石墨（EG）含量的石蜡基复合材料的导热性能、泄漏性能和热可靠性。结果表明，石蜡/EG复合材料具有良好的热稳定性，在多次热循环后仍能保持相变储热能力。在此基础上，研制了热电集热器样机，其中EG在PCM中的比例是平衡蓄热量和传热率的关键。通过仿真和实验两种方法对收割机的性能进行了评估。实验证明，石蜡/5wt%EG复合材料热电集热器具有最大的总能量输出和最大比例的高品位电能。
In this study, a thermoelectric energy harvesting device applied with extremely large temperature variation (from+ 100° C to− 50° C) for space application is presented using phase change material (PCM) for thermal control and storage. Aiming at developing a high-performance PCM to fill into the heat storage unit (HSU) of the device, the thermal conductivity, leakage and thermal reliability of paraffin-based composites with different loadings of expanded graphite (EG) were investigated. Results showed the form-stable paraffin/EG composite has enhanced thermal conductivity and maintainable latent heat storage capacity after repeated thermal cycling test. Furthermore, the prototype device of thermoelectric harvester was developed, where the proportion of EG in the PCM is key to balance the heat storage capacity and the heat transfer rate. Both simulation and experiment are used to evaluate the performance of the harvester. The experimental evidence verifies that the thermoelectric harvester with paraffin/5 wt% EG composite owns the largest total energy output and the most portion of high-grade electrical energy.