Effects of impregnating variables on dynamic sorption characteristics and storage properties of composite sorbent for solar heat storage

Huijun Wu, Shengwei Wang, Dongsheng Zhu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

46 Citations (Scopus)

Abstract

A family of composite sorbents was prepared by impregnating silica gel in the solution of the hygroscopic salt CaCl2for solar heat storage. The characteristics of water adsorbed on the composite sorbents prepared under different impregnating conditions were measured by a micromeritics gas adsorption analyzer, a Calvet-type microcalorimeter and an open-type gravimetric method. From the results of these dynamic sorption measurements, the effects of impregnating variables on the characteristics of water adsorbed on the composite sorbents were evaluated. The composite sorbents prepared under different impregnating conditions were also tested on an open-type sorption storage system. The composite sorbent prepared by impregnating in the CaCl2solution of 30% showed a high and stable storage capacity of 1020 J g-1at the charging temperature of about 90 °C. This study demonstrates a great potential in controlling the sorption characteristics as well as the storage properties of the composite sorbents by optimizing the impregnating variables to meet the specific demands of solar heat storage.
Original languageEnglish
Pages (from-to)864-871
Number of pages8
JournalSolar Energy
Volume81
Issue number7
DOIs
Publication statusPublished - 1 Jul 2007

Keywords

  • Composite sorbent
  • Solar heat storage
  • Sorption characteristics
  • Sorption storage
  • Storage property

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films

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