Composite “LiCl/MWCNT” as advanced water sorbent for thermal energy storage: Sorption dynamics

Alexandra D. Grekova, Larisa G. Gordeeva, Zisheng Lu, Ruzhu Wang, Yuri I. Aristov

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Sorption heat storage (SHS) is a promising technology towards efficient use of renewable energy sources. Composite materials based on hygroscopic salts have a high potential for SHS in term of the heat storage capacity. Recently, a new sorbent “LiCl confined to Multi-Wall Carbon NanoTubes (MWCNT)” with enhanced storage capacity (1.7 kJ/g) has been suggested for SHS. This work addresses the dynamic study of water sorption on this material under operating conditions of a daily heat storage cycle. The study consists of three parts: (1) shaping the LiCl/MWCNT composite as grains (GP) and pellets with (PB) and without a binder (PP); (2) water sorption dynamics under conditions of the selected SHS cycle; (3) evaluation of the specific power achievable. Various configurations of the adsorbent bed were tested, namely, the loose grains GP placed on a metal support, and the pellets PB and PP glued to the support. The dynamic curves of water sorption obey an exponential equation. The PB configuration ensured a maximal specific power of 11.2 kW/kg (at 70% conversion) during the heat storage stage. During the heat release stage, the specific power is lower (5.4 kW/kg), probably due to a kinetic hindrance attributed to solid-solid transformation during the decomposition of LiCl·H2O complex towards the anhydrous salt. The high specific power along with the large heat storage capacity make the LiCl/MWCNT composite a promising new candidate for SHS.

Original languageEnglish
Pages (from-to)273-279
Number of pages7
JournalSolar Energy Materials and Solar Cells
Volume176
DOIs
Publication statusPublished - 1 Mar 2018

Keywords

  • Composite sorbent “salt/matrix”
  • Lithium chloride
  • Multiwall carbon nanotubes
  • Sorption thermal energy storage
  • Water vapor
  • HIGH-TEMPERATURE
  • SOLAR-ENERGY
  • Composite sorbent "salt/matrix"
  • OF-THE-ART
  • ADSORPTIVE HEAT TRANSFORMATION
  • SALT
  • DENSITY
  • POROUS MATRIX
  • SYSTEMS
  • ADSORBENT
  • NH2-MIL-125

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