Abstract During the last decades, salt hydrates have become increasingly popular in research on phase change materials (PCM) due to their generally higher phase transition enthalpies and lower costs compared to organic PCM. However, in most published reviews on phase transition enthalpies of salt hydrates, the data stems from earlier data collections and the original experimental sources are often not mentioned. Therefore, a review on original experimental phase transition enthalpies of selected salt hydrates based on chlorides, hydroxides, and nitrates as well as some other materials popular in PCM literature is provided here. Additionally, information on the preparation process of the samples is contained along with the used calorimeter. This information helps to assess the experimental results especially for salt hydrates where considerable deviations for the phase transition enthalpies exist in literature. Even though salt hydrates are heterogeneous materials, the collected data shows that it is possible to obtain reliable values for their phase transition enthalpies via differential scanning calorimetry (DSC), but only under certain conditions.

中文翻译：

---

固-液相变材料背景下盐水相变焓测量的批判性评论

摘要 在过去的几十年中，盐水合物由于与有机相变材料相比具有更高的相变焓和更低的成本，因此在相变材料 (PCM) 的研究中越来越受欢迎。然而，在大多数已发表的关于盐水合物相变焓的评论中，数据来源于早期的数据收集，并且通常没有提及原始实验来源。因此，这里提供了对基于氯化物、氢氧化物和硝酸盐以及 PCM 文献中流行的其他一些材料的选定盐水合物的原始实验相变焓的综述。此外，还包含有关样品制备过程的信息以及所使用的热量计。该信息有助于评估实验结果，特别是对于盐水合物，文献中相变焓存在相当大的偏差。尽管盐水合物是异质材料，但收集到的数据表明，可以通过差示扫描量热法 (DSC) 获得可靠的相变焓值，但仅限于某些条件。