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首页> 外文期刊>Energy Conversion & Management >Phase change and heat transfer characteristics of a eutectic mixture of palmitic and stearic acids as PCM in a latent heat storage system
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Phase change and heat transfer characteristics of a eutectic mixture of palmitic and stearic acids as PCM in a latent heat storage system

机译：潜热存储系统中棕榈酸和硬脂酸的共晶混合物作为PCM的相变和传热特性

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摘要

The phase change and heat transfer characteristics of a eutectic mixture of palmitic and stearic acids as phase change material (PCM) during the melting and solidification processes were determined experimentally in a vertical two concentric pipes energy storage system. This study deals with three important subjects. First is determination of the eutectic composition ratio of the palmitic acid (PA) and stearic acid (SA) binary system and measurement of its thermophysical properties by differential scanning calorimetry (DSC). Second is establishment of the phase transition characteristics of the mixture, such as the total melting and solidification temperatures and times, the heat transfer modes in the melted and solidified PCM and the effect of Reynolds and Stefan numbers as initial heat transfer fluid (HTF) conditions on the phase transition behaviors. Third is calculation of the heat transfer coefficients between the outside wall of the HTF pipe and the PCM, the heat recovery rates and heat fractions during the phase change processes of the mixture and also discussion of the effect of the inlet HTF parameters on these characteristics. The DSC results showed that the PA-SA binary system in the mixture ratio of 64.2:35.8 wt% forms a eutectic, which melts at 52.3℃ and has a latent heat of 181.7 J g~(-1), and thus, these properties make it a suitable PCM for passive solar space heating and domestic water heating applications with respect to climate conditions. The experimental results also indicated that the eutectic mixture of PA-SA encapsulated in the annulus of concentric double pipes has good phase change and heat transfer characteristics during the melting and solidification processes, and it is an attractive candidate as a potential PCM for heat storage in latent heat thermal energy storage systems.
机译：在垂直和两个同心圆管储能系统中，通过实验确定了棕榈酸和硬脂酸的共晶混合物作为相变材料（PCM）在熔化和凝固过程中的相变和传热特性。这项研究涉及三个重要主题。首先是确定棕榈酸（PA）和硬脂酸（SA）二元体系的共晶组成比，并通过差示扫描量热法（DSC）测量其热物理性质。其次是确定混合物的相变特性，例如总熔化和固化温度和时间，熔化和固化的PCM中的传热模式以及作为初始传热流体（HTF）条件的雷诺数和Stefan数的影响关于相变行为。第三是计算HTF管的外壁和PCM之间的传热系数，混合物相变过程中的热回收率和热量分数，并讨论入口HTF参数对这些特性的影响。 DSC结果表明，PA-SA二元体系的混合比为64.2：35.8 wt％，形成共晶，共晶在52.3℃下熔化，潜热为181.7 J g〜（-1），因此具有这些性质。使其成为适合气候条件下被动式太阳能空间供暖和家庭热水应用的PCM。实验结果还表明，包封在同心双管环空中的PA-SA的共晶混合物在熔化和凝固过程中具有良好的相变和传热特性，作为潜在的PCM储热材料是有吸引力的候选物。潜热热能存储系统。

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