scholarly journals Ethylene glycol nanofluids dispersed with monolayer graphene oxide nanosheet for high-performance subzero cold thermal energy storage

RSC Advances ◽  
2021 ◽  
Vol 11 (49) ◽  
pp. 30495-30502
Author(s):  
Jingyi Zhang ◽  
Benwei Fu ◽  
Chengyi Song ◽  
Wen Shang ◽  
Peng Tao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Ethylene Glycol ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
High Performance ◽  
Monolayer Graphene ◽  
Graphene Oxide Sheet ◽  
Graphene Oxide Nanosheet ◽  
Glycol Solution

Homogeneously dispersed monolayer graphene oxide sheet in ethylene glycol solution enable a high-performance cold thermal energy storage.

Performance of Latent Heat Solar Thermal Energy Storage System Using Various Heat Transfer Fluids

2015 ◽  
Vol 787 ◽  
pp. 27-31
Author(s):  
M. Gajendiran ◽  
P.M. Sivaram ◽  
N. Nallusamy
Keyword(s):  
Energy Storage ◽  
Ethylene Glycol ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Solar Thermal Energy ◽  
Heat Transfer Fluids ◽  
Charging Time ◽  
Thermal Energy Storage System

In the present work the thermal performance of Phase Change Material (PCM) based solar thermal energy storage system under the influence of different heat transfer fluids (HTF) have been investigated. Water, Ethylene Glycol–water and Copper nanofluid are selected as HTF. Paraffin is used as PCM and encapsulated in cylindrical capsules. The thermal energy storage (TES) tank acts as a storage unit consisting PCM capsules packed in three beds surrounded by water, which acts as sensible heat storage (SHS) material. HTF circulated by a pump transfers heat from solar flat plate collector (FPC) to the TES tank. 25% ethylene glycol -75% water HTF is prepared by mixing ethylene glycol (EG) with water. Copper-distilled water nanofluids (0.3% by weight) are prepared using prolonged sonication with sodium dodecyl benzene sulphonate (SDBS) as the surfactant. Various performance parameters such as charging time, instantaneous heat stored, cumulative heat stored and system efficiency are studied for various HTFs. It is found that the charging time is reduced by 33.3% for copper nanofluid and 22.2% for ethylene glycol- water mixture HTFs. It is also observed that there is an increase in system efficiency and cumulative heat stored with reference to charging time for these HTFs when compared with conventional HTF 1 i.e. water.

scholarly journals Graphene Modified Montmorillonite Based Phase Change Material for Thermal Energy Storage with Enhanced Interfacial Thermal Transfer

2020 ◽  
Author(s):  
Kang Peng ◽  
Hongjie Wang ◽  
Pengfei wan ◽  
Jianwei Wang ◽  
Hua Luo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Stearic Acid ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Thermal Transfer ◽  
Modified Montmorillonite ◽  
Change Material

Abstract Thermal energy storage technology plays a crucial role in the thermal management system. Clay based organic phase change material has considerable advantages in the application of thermal energy storage due to low cost and high energy storage capacity. However, the low thermal conductivity of clay, especially poor interfacial thermal transfer, limits its thermal energy storage efficiency. Herein, stearic acid/reduced graphene oxide modified montmorillonite composites (SA/RGO-MMT) were prepared by the vacuum impregnation of stearic acid into graphene modified montmorillonite matrix, which was obtained via the in situ reduction of graphene oxide on the surface of montmorillonite. Stearic acid is assembled in the porous structures of RGO-MMT with the physical interactions. SA/RGO-MMT possesses high melting enthalpy of 159 J/g, low extent of supercooling of 1.4 oC and excellent thermal reliability after 100 thermal cycling. Energy storage and release rates of SA/RGO-MMT were significantly improved due to the enhanced interfacial thermal transfer by graphene. Therefore, SA/RGO-MMT is a promising form-stable phase change material for applications in solar heat storage fields. The strategy in this study highlights the importance of enhancing interfacial thermal transfer for the efficient thermal energy storage materials.

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