Thermochemical heat storage performances of fluidized black CaCO3 pellets under direct concentrated solar irradiation

Hangbin Zheng, Xianglei Liu, Yimin Xuan, Chao Song, Dachuan Liu, Qibin Zhu, Zhonghui Zhu, Ke Gao, Yongliang Li, Yulong Ding

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Conventional solar thermochemical heat storage based on indirect surface-heating usually suffers from high heat losses and low solar-chemical efficiency. Here, a different solar thermochemical heat storage system based on direct solar illumination on fluidized black CaCO3 pellets is proposed. A Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) model considering irradiation ray tracing, granular flow, heat and mass transfer, and chemical reaction, is built. Black CaCO3 pellets are fabricated via a facile template mixing method, and the solar absorptance is enhanced to 63.9% from 27.9% of traditional pure CaCO3. Effects of gas velocity and irradiative flux on thermochemical heat storage performance in a fluidized volumetric bed are investigated by incorporating measured kinetic and solar absorptance properties of designed black CaCO3 pellets. The peak solar-chemical efficiency reaches a value higher than 43% benefiting from enhanced solar absorptance, higher gas velocity and irradiative flux. This work guides the design of the high-efficiency direct solar thermochemical heat storage system.

Original languageEnglish
Pages (from-to)1353-1369
Number of pages17
JournalRenewable Energy
Early online date6 Jul 2021
Publication statusPublished - Nov 2021

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China (No. 51820105010 , 52076106 , and 52111530136 ). We also wants to thank the support from Natural Science Foundation of Jiangsu Province (No. BK20202008 ) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX21_0210 ).

Publisher Copyright:
© 2021 Elsevier Ltd


  • Calcium carbonate
  • Direct irradiation
  • Fluidized bed
  • Full-spectrum
  • Thermochemical heat storage

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment


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