Industrial waste heat recovery using an enhanced conductivity latent heat thermal energy storage
Industrial waste heat recovery using an enhanced conductivity latent heat thermal energy storage
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DOI：
10.1016/j.apenergy.2016.09.007
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发表时间：
2016-12
期刊：
影响因子：
11.2
通讯作者：
K. Merlin;Jérôme Soto;D. Delaunay;Luc Traonvouez
中科院分区：
文献类型：
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作者：
K. Merlin;Jérôme Soto;D. Delaunay;Luc Traonvouez
这项工作的目的是目前的潜热热能存储的实验性能。介绍了一种用于食品工业余热回收的演示装置。储存器由浸渍有石蜡的膨胀天然石墨基质组成。这种复合材料已经在以前的工作中进行了研究，似乎是需要高传热密度的应用的最佳解决方案之一，定义为所需的热功率和储存的能量的比率。研究了冷库在冷却和加热阶段的热性能。结果表明，该蓄冷装置可节约6 kW·h，占整个过程能量的15%，并可提供大于100 kW的热功率，符合设计阶段的规划。在加热和冷却性能之间出现差异。对引起这种现象的原因提出了一些假设，如传热流体粘度的变化、通过外壳的热损失或包含存储材料的热交换器内的接触热阻的变化。最后，一个经济的方法进行，显示的制造成本为260 €/kW·h和投资回收期在500天内为该应用程序。
The aim of this work is to present the experimental performance of a latent heat thermal energy storage. A demonstrator devoted to recover waste heat in food processing industry is investigated. The storage is composed of an expanded natural graphite matrix impregnated with paraffin wax. This kind of composite material has been studied in previous works and appears to be one of the best solutions for the applications requiring a high heat transfer density, defined as the ratio of requested thermal power and stored energy. An investigation of the thermal performance of the storage during cooling and heating phases is presented. The results show that the storage is able to save 6 kW·h, which represents 15% of the energy of the process and delivers a thermal power larger than 100 kW, as planned during the design phase. Differences appear between the performances in heating and cooling. Some assumptions on the causes of this phenomenon are proposed, such as the change of viscosity of the heat transfer fluid, the heat losses through the external casing, or the variation of the thermal contact resistance within the heat exchanger containing the storage material. Finally, an economical approach is performed, showing a manufacturing cost of 260 €/kW·h and a payback period within 500 days for this application.