Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (4): 1273-1284.doi: 10.19799/j.cnki.2095-4239.2021.0026

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Research progress on physical property control and heat and mass transfer optimization of hydrated salt in thermochemical heat storage reactor

Yimo LUO1(), Jinjin RUI1, Wei XU1, Jinqing PENG1, Xiaohui SHE2,3(), Nianping LI1, Yulong DING3   

  1. 1.Faculty of Civil Engineering, Hunan University, Changsha 410082, Hunan, China
    2.School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China
    3.School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK
  • Received:2021-01-19 Revised:2021-04-17 Online:2021-07-05 Published:2021-06-25
  • Contact: Yimo LUO,Xiaohui SHE E-mail:yimoluo@hnu.edu.cn;SheXH19@hotmail.com

Abstract:

Thermochemical energy storage using salt hydrates has the advantages of high heat storage density, less heat loss, and seasonal storage adaptability. It is an effective method to provide clean heating along with renewable energy, such as solar energy, to achieve carbon neutrality. A heat storage reactor is an important component of salt hydrate-based thermochemical energy storage; moreover, it determines the efficiency and reliability of energy storage systems. However, owing to unsuitable material formulations and structural designs, a heat storage reactor has limitations such as low thermal power, poor cycle stability, and short service life. To address these issues, this study reviewed state-of-the-art methods for reactor optimization in terms of salt hydrate formulation and heat and mass transfer mechanisms. Unlike existing review studies, this study introduced a novel type of material, i.e., a metal-organic framework (MOF), in the field of salt hydrate-based thermochemical energy storage. The results demonstrate that the performance of composite salt hydrates based on MOFs is better than that of traditional skeleton materials. This study summarizes the heat and mass transfer mechanisms and mathematical models of the reactor and related experimental research and performance optimization. Based on an in-depth analysis, this study highlights the priorities of future research, including the development of high-performance composite salt hydrates, a study of the reactor on both micro- and nano-scales, and optimization of the reactor structure. This study is significant for suggesting improvements in the heat mass transfer performance and stability of reactors for thermochemical energy storage.

Key words: thermochemical energy storage, salt hydrates, metal-organic frameworks, heat and mass transfer

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