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

*Corresponding author for this work

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


Dive into the research topics of 'Thermochemical heat storage performances of fluidized black CaCO3 pellets under direct concentrated solar irradiation'. Together they form a unique fingerprint.

Cite this