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首页> 外文期刊>International Journal of Heat and Mass Transfer >Evaluation of metal foam based thermoelectric generators for automobile waste heat recovery
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Evaluation of metal foam based thermoelectric generators for automobile waste heat recovery

机译：基于金属泡沫的汽车余热回收热电发电机的评估

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This paper focuses on harvesting heat emitted by exhaust systems efficiently using thermoelectric generators (TEGs) and converting it to electricity. In a TEG that employs gaseous working fluid, up to 80% of the thermal resistance is due to the gas side. Maximizing the energy transferred from the hot exhaust gas to the hot side of the thermoelectric modules by suitable enhancement techniques can result in an efficiency gain for the TEG. To this end, we have investigated the performance of metal foam-based heat exchangers for reducing thermal resistance of the hot side in TEGs. A computational model of the metal foam-enhanced TEG, solving for the coupled thermal and electrical energy transfer processes, was developed to investigate the enhancement in system performance for a range of metal foam porosities and pore densities, and mass flow rates of the exhaust gas. Skutterudites with multiple cofillers were selected as thermoelectric materials. The primary performance metrics that were analyzed include the electrical power output and the associated pressure drop for various inlet conditions of the exhaust gas. Based on the trade-off between the increased pumping power required to offset the increase in pressure drop, and the gain in heat transfer coefficient with increase in mass flow rate of the exhaust gas, an optimal mass flow rate that maximizes the net electric power produced by the metal foam-enhanced TEG was obtained. The results show a critical exhaust flow rate for different pore densities of metal foam beyond which the net electric power produced by the TEG is less than of the TEG with no metal foam. At this critical flow rate, the maximum net electric power produced from exhaust waste heat by metal foam enhanced TEG is 5.7 (20 PPI) to 7.8 (5 PPI) times higher than that generated by the configuration without metal foam.
机译：本文着重于利用热电发生器（TEG）有效地收集排气系统散发的热量并将其转化为电能。在采用气态工作流体的TEG中，高达80％的热阻归因于气体侧。通过适当的增强技术使从热废气传递到热电模块热侧的能量最大化，可以提高TEG的效率。为此，我们研究了基于泡沫金属的热交换器在降低TEG中热侧的热阻方面的性能。开发了一种金属泡沫增强的TEG的计算模型，用于求解热电传递耦合过程，以研究在一系列金属泡沫孔隙率和孔隙密度以及废气质量流量方面系统性能的提高。选择具有多个填充剂的方钴矿作为热电材料。分析的主要性能指标包括废气的各种进气条件下的电功率输出和相关的压降。基于抵消压降增加所需的增加的泵送功率与废气质量流量增加时传热系数的增加之间的权衡，可以使产生的净电能最大化的最佳质量流量通过金属泡沫增强的TEG获得。结果表明，对于不同孔隙密度的金属泡沫，临界排气流速超过了该极限，则TEG产生的净电功率要比没有金属泡沫的TEG少。在此临界流速下，金属泡沫增强型TEG的废热产生的最大净电力是无金属泡沫配置产生的最大净电力的5.7（20 PPI）至7.8（5 PPI）倍。

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