Preparation and influence factors of low-grade thermal-energy storage material

Hui Jun Wu, Dong Sheng Zhu, Shengwei Wang, Chun Hua Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


A composite low-grade thermal-energy storage sorbent was first prepared by impregnating hygroscopic salt CaCl2 into silica gel. Next, the water-adsorbing properties of the prepared sorbent and pure silica gel were measured and compared. Then, the corresponding thermal-energy storage properties were investigated in a sorption setup. Finally, the factors affecting the adsorbing properties of the composite sorbent were studied. Experimental results show a proper impregnation period of 4 h and an increase in water adsorption and specific thermal-energy storage density with the increases of CaCl2 content and impregnation temperature. It is also indicated that the specific thermal-energy storage density of the composite sorbent increases up to 1050 J/g with the amount of adsorbed water, and that the composite sorbent can be effectively regenerated at 90°C. Therefore, the composite sorbent is feasible to store and utilize the low-grade thermal energy, such as solar energy and industrial-waste heat.
Original languageChinese (Simplified)
Pages (from-to)6-9
Number of pages4
JournalHuanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science)
Issue number3
Publication statusPublished - 1 Mar 2006


  • Composite sorbent
  • Energy storage
  • Low-grade heat
  • Preparation

ASJC Scopus subject areas

  • General Engineering

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