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Eutectic mixtures of some fatty acids for latent heat storage: Thermal properties and thermal reliability with respect to thermal cycling

机译：某些脂肪酸的共晶混合物，用于潜热存储：关于热循环的热性质和热可靠性

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Accelerated thermal cycle tests have been conducted to study the change in melting temperatures and latent heats of fusion of the eutectic mixtures of lauric acid (LA)-myristic acid (MA), lauric acid (LA)-pal-mitic acid (PA) and myristic acid (MA)-stearic acid (SA) as latent heat storage materials. The thermal properties of these materials were determined by the differential scanning calorimetry (DSC) analysis method. The thermal reliability of the eutectic mixtures after melt/freeze cycles of 720, 1080 and 1460 was also evaluated using the DSC curves. The accelerated thermal cycle tests indicate that the melting temperatures usually tend to decrease, and the variations in the latent heats of fusion are irregular with increasing number of thermal cycles. Moreover, the probable reasons for the change in thermal properties of the eutectic mixtures after repeated thermal cycles were investigated. Fourier Transform Infrared (FT-IR) spec-troscopic analysis indicates that the accelerated melt/freeze processes do not cause any degradation in the chemical structure of the mixtures. The change in thermal properties of the eutectic mixtures with increasing number of thermal cycles is only because of the presence of certain amounts of impurities in the fatty acids used in their preparation. It is concluded that the tested eutectic mixtures have reasonable thermal properties and thermal reliability as phase change materials (PCMs) for latent heat storage in any solar heating applications that include a four year utilization period.
机译：已经进行了加速的热循环试验，以研究月桂酸（LA）-肉豆蔻酸（MA），月桂酸（LA）-棕榈-mitic酸（PA）的共熔混合物的熔融温度和熔化潜热的变化。肉豆蔻酸（MA）-硬脂酸（SA）作为潜热存储材料。这些材料的热性能通过差示扫描量热法（DSC）分析方法确定。还使用DSC曲线评估了720、1080和1460的熔融/冻结循环后的共晶混合物的热可靠性。加速热循环试验表明，熔化温度通常趋于降低，并且随着热循环次数的增加，熔融潜热的变化是不规则的。此外，研究了反复热循环后共晶混合物热性能变化的可能原因。傅立叶变换红外（FT-IR）光谱分析表明，加速的熔融/冻结过程不会引起混合物化学结构的任何降解。共晶混合物的热性质随热循环次数的增加而变化仅是因为在其制备中所使用的脂肪酸中存在一定量的杂质。结论是，经测试的共晶混合物具有合理的热性能和热可靠性，可作为相变材料（PCM）用于潜伏性储热，适用于包括四年使用期限的任何太阳能供热应用。

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