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A comparative analysis of the performance of LHTES systems- case study: cylindrical exchanger with and without annular fins

机译：LHTES系统性能研究的对比分析 - 案例研究：圆柱形交换器，圆柱形交换器

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The Thermal Energy Storage (TES) occupied an important role in the reasonable use of energy, because it allows the decoupling between the production and the energy demand in the applications with intermittent energy production. In recent years, many researchers have highlighted the use of Latent Heat Thermal Energy Storage (LHTES) systems, this is especially because the high energy density can be stored during phase change. Notwithstanding this great potential, the feasibility of LHTES with PCM is still limited, mainly due to a low thermal conductivity. In this sense, the exchanger with fins is the most effective proposal which is based on the increase of the exchange surface. After a review of recent advances in LHS systems with a focus on methods for improving the thermal conductivity of MCPs, and a selection methodology (Exchanger + PCM) adequate. The main objective of this paper is to develop, perform and compare a numerical study of a new finned exchanger (double pipe with Longitudinal fins on the external pipe, Phase Change Material in the annular space between the two pipes and HTF in the inner pipe) with a classic exchanger without fins. This comparative study was done according to the process of heat transfer during melting (charging) at average temperature (180-280 °C). In addition, the results obtained were adapted for an implementation of Fresnel solar power installed at Green Energy Park (1 MWe) in Morocco. This study has shown that the first exchanger has a good compactness, can store enough latent energy, and significantly overcome the problem of low thermal conductivity related to the second heat exchanger.
机译：热能存储（TES）在合理使用能量中占据了重要作用，因为它允许在具有间歇性能量的应用中生产和能量需求之间的解耦。近年来，许多研究人员突出了使用潜热热能储存（LHTES）系统，特别是因为在相变期间可以储存高能量密度。尽管有这种巨大的潜力，但具有PCM的LHTE的可行性仍然有限，主要是由于导热性低。从这个意义上讲，与鳍的交换器是基于交换表面的增加的最有效的提案。在审查LHS系统最近的进展之后，专注于提高MCP的导热率的方法，以及适当的选择方法（交换机+ PCM）。本文的主要目的是开发，执行和比较新的翅片交换机的数值研究（外管上具有纵向翅片的双管，两个管道之间的环形空间中的相变材料）使用没有鳍的经典交换机。根据平均温度（180-280℃）的熔化（充电）期间的热传递过程进行该比较研究。此外，所获得的结果适用于在摩洛哥的绿色能源园（1 MWE）安装的菲涅耳太阳能电力。本研究表明，第一交换器具有良好的紧凑性，可以存储足够的潜能，并显着克服与第二热交换器相关的低导热率的问题。

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