Analysis of the solidification and phase separation of calcium chloride hexahydrate with different water content by means of X-ray computed tomography

Dario Guarda , Jorge Martinez-Garcia , Benjamin Fenk , Poppy O'Neill , Rebecca Ravotti , Damian Gwerder , Anastasia Stamatiou , Jörg Worlitschek , Simone Mancin , Philipp Schuetz
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Abstract

X-ray computed tomography (XCT) is a well-known technology that is quite new to the field of research of non-metallic phase change materials (PCMs) employed in latent thermal energy storages (LTESs). The current work demonstrate the value of XCT, opening unprecedent opportunities to obtain new insights on solid-liquid phase transition. XCT permits to measure accurately volumetric liquid fraction, observing the formation of voids and phase separation, also known as segregation, which is hindering the deployment of salt hydrates, a particular class of PCMs known for their relatively low cost compared to their quite high volumetric energy density. The capabilities of XCT could eventually lead to the understanding of the segregation phenomenon of salt hydrates and in the future, reliable salt hydrates-based LTES will be able to support the energy transition.
In the current study, the potential of XCT is shown during the analysis of calcium chloride hexahydrate (CaCl2·6H2O). XCT accuracy and rigorous protocol make it a potential benchmark for new measurement technologies.
不同含水量的六水氯化钙凝固与相分离的x射线计算机断层扫描分析
x射线计算机断层扫描技术(XCT)是非金属相变材料(PCMs)用于潜热储能(less)研究领域的一项众所周知的新技术。目前的工作证明了XCT的价值,为获得固液相变的新见解提供了前所未有的机会。XCT允许精确测量体积液体分数,观察空隙的形成和相分离(也称为偏析),这阻碍了盐水合物的部署,盐水合物是一类特殊的pcm,与它们相当高的体积能量密度相比,它们的成本相对较低。XCT的能力可能最终导致对盐水合物分离现象的理解,在未来,可靠的基于盐水合物的LTES将能够支持能源转换。在目前的研究中,XCT的潜力在六水氯化钙(CaCl2·6H2O)的分析中得到了体现。XCT的精度和严格的协议使其成为新测量技术的潜在基准。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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