Research output: Contribution to journal › Article › peer-review
Composite “LiCl/vermiculite” as advanced water sorbent for thermal energy storage. / Grekova, Alexandra D.; Gordeeva, Larisa G.; Aristov, Yuri I.
In: Applied Thermal Engineering, Vol. 124, 09.2017, p. 1401-1408.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Composite “LiCl/vermiculite” as advanced water sorbent for thermal energy storage
AU - Grekova, Alexandra D.
AU - Gordeeva, Larisa G.
AU - Aristov, Yuri I.
PY - 2017/9
Y1 - 2017/9
N2 - Sorption heat storage (SHS) is a promising technology towards efficient use of renewable energy sources. Materials based on hygroscopic salts and their hydrates have a high potential for SHS in term of heat storage capacity. This work addresses the study of the novel composite water sorbent based on expanded vermiculite impregnated with LiCl, specified for two particular SHS cycles, namely seasonal and daily heat storage in winter. The paper consists of two parts: (i) preparation of the LiCl/vermiculite composite and study of its texture, phase composition, as well as equilibrium and dynamics of water sorption; and (ii) evaluation of the potential of the new sorbent for the selected SHS cycles. The results obtained show that the salt, dispersed inside the vermiculite pores, reacts with water molecules, forming the crystalline hydrates LiCl·nH2O (n = 1, 2). The heat storage capacity of the LiCl/vermiculite reaches 2.3 (224 kW h/m3) and 2.6 kJ/g (253 kW h/m3) for seasonal and daily SHS cycles at the charging temperature 75–85 °C, that exceeds the appropriate values for common and innovative adsorbents suggested for SHS. This demonstrates the high potential of the new composite for SHS and promotes the broader implementation of this emerging technology.
AB - Sorption heat storage (SHS) is a promising technology towards efficient use of renewable energy sources. Materials based on hygroscopic salts and their hydrates have a high potential for SHS in term of heat storage capacity. This work addresses the study of the novel composite water sorbent based on expanded vermiculite impregnated with LiCl, specified for two particular SHS cycles, namely seasonal and daily heat storage in winter. The paper consists of two parts: (i) preparation of the LiCl/vermiculite composite and study of its texture, phase composition, as well as equilibrium and dynamics of water sorption; and (ii) evaluation of the potential of the new sorbent for the selected SHS cycles. The results obtained show that the salt, dispersed inside the vermiculite pores, reacts with water molecules, forming the crystalline hydrates LiCl·nH2O (n = 1, 2). The heat storage capacity of the LiCl/vermiculite reaches 2.3 (224 kW h/m3) and 2.6 kJ/g (253 kW h/m3) for seasonal and daily SHS cycles at the charging temperature 75–85 °C, that exceeds the appropriate values for common and innovative adsorbents suggested for SHS. This demonstrates the high potential of the new composite for SHS and promotes the broader implementation of this emerging technology.
KW - Composite sorbent “salt/matrix”
KW - Expanded vermiculite
KW - Lithium chloride
KW - Sorption thermal energy storage
KW - Water vapor
KW - SILICA-GEL
KW - SOLAR-ENERGY
KW - Composite sorbent "salt/matrix"
KW - LOW-TEMPERATURE HEAT
KW - ADSORPTIVE HEAT TRANSFORMATION
KW - CHILLERS
KW - SYSTEMS
KW - ADSORBENT
KW - OPTIMIZATION
KW - SORPTION PROPERTIES
KW - CYCLE
UR - http://www.scopus.com/inward/record.url?scp=85021636950&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2017.06.122
DO - 10.1016/j.applthermaleng.2017.06.122
M3 - Article
AN - SCOPUS:85021636950
VL - 124
SP - 1401
EP - 1408
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
SN - 1359-4311
ER -
ID: 10098198