Fabrication and characteristics of composite phase change material based on Ba(OH)2·8H2O for thermal energy storage

Qiangqiang Xiao; Wenhui Yuan; Li Li; Tao Xu

doi:10.1016/j.solmat.2017.12.032

Fabrication and characteristics of composite phase change material based on Ba(OH)₂·8H₂O for thermal energy storage

Qiangqiang Xiao
, Wenhui Yuan
, Li Li
, Tao Xu

Department of Architecture and Civil Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

94 Citations (Scopus)

Abstract

Latent thermal energy storage using phase change material (PCM) is an effective way to store and transport energy. In this work, expanded graphite was modified using octylphenol polyoxyethylene ether to generate modified expanded graphite (MEG), and then a novel shape-stabilized Ba(OH)₂·8H₂O/MEG composite PCM was synthesized by incorporating Ba(OH)₂·8H₂O into MEG matrix. Mass fractions of Ba(OH)₂·8H₂O in composite PCM were calculated from 74% to 93%. The effects of MEG on properties of PCM were investigated using scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and thermal constant analyzer. The results indicated that MEG had the desired compatibility with Ba(OH)₂·8H₂O. The phase separation of Ba(OH)₂·8H₂O was effectively inhibited by the MEG matrix and the supercooling temperature decreased from 13 °C for Ba(OH)₂·8H₂O to 2.4 °C for composite PCM with a MEG matrix density of 200 g/L. At the same matrix density, the thermal conductivity of composite PCM reached 3.58 W/(m K), 1.84 times higher than that of Ba(OH)₂·8H₂O. The latent heat was approximately equal to the product of the latent heat of Ba(OH)₂·8H₂O and its mass fraction. Moreover, the enthalpy loss of the composite PCM was negligible after 400 cycles, showing good thermal reliability.

Original language	English
Pages (from-to)	339-345
Journal	Solar Energy Materials and Solar Cells
Volume	179
Online published	3 Jan 2018
DOIs	https://doi.org/10.1016/j.solmat.2017.12.032
Publication status	Published - 1 Jun 2018

Research Keywords

Ba(OH)2·8H2O
Composite phase change material
Modified expanded graphite
Thermal energy storage

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@article{84067b05ce154b64a308a5660915be7c,

title = "Fabrication and characteristics of composite phase change material based on Ba(OH)2·8H2O for thermal energy storage",

abstract = "Latent thermal energy storage using phase change material (PCM) is an effective way to store and transport energy. In this work, expanded graphite was modified using octylphenol polyoxyethylene ether to generate modified expanded graphite (MEG), and then a novel shape-stabilized Ba(OH)2·8H2O/MEG composite PCM was synthesized by incorporating Ba(OH)2·8H2O into MEG matrix. Mass fractions of Ba(OH)2·8H2O in composite PCM were calculated from 74\% to 93\%. The effects of MEG on properties of PCM were investigated using scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and thermal constant analyzer. The results indicated that MEG had the desired compatibility with Ba(OH)2·8H2O. The phase separation of Ba(OH)2·8H2O was effectively inhibited by the MEG matrix and the supercooling temperature decreased from 13 °C for Ba(OH)2·8H2O to 2.4 °C for composite PCM with a MEG matrix density of 200 g/L. At the same matrix density, the thermal conductivity of composite PCM reached 3.58 W/(m K), 1.84 times higher than that of Ba(OH)2·8H2O. The latent heat was approximately equal to the product of the latent heat of Ba(OH)2·8H2O and its mass fraction. Moreover, the enthalpy loss of the composite PCM was negligible after 400 cycles, showing good thermal reliability.",

keywords = "Ba(OH)2·8H2O, Composite phase change material, Modified expanded graphite, Thermal energy storage",

author = "Qiangqiang Xiao and Wenhui Yuan and Li Li and Tao Xu",

year = "2018",

month = jun,

day = "1",

doi = "10.1016/j.solmat.2017.12.032",

language = "English",

volume = "179",

pages = "339--345",

journal = "Solar Energy Materials and Solar Cells",

issn = "0927-0248",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Fabrication and characteristics of composite phase change material based on Ba(OH)2·8H2O for thermal energy storage

AU - Xiao, Qiangqiang

AU - Yuan, Wenhui

AU - Li, Li

AU - Xu, Tao

PY - 2018/6/1

Y1 - 2018/6/1

N2 - Latent thermal energy storage using phase change material (PCM) is an effective way to store and transport energy. In this work, expanded graphite was modified using octylphenol polyoxyethylene ether to generate modified expanded graphite (MEG), and then a novel shape-stabilized Ba(OH)2·8H2O/MEG composite PCM was synthesized by incorporating Ba(OH)2·8H2O into MEG matrix. Mass fractions of Ba(OH)2·8H2O in composite PCM were calculated from 74% to 93%. The effects of MEG on properties of PCM were investigated using scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and thermal constant analyzer. The results indicated that MEG had the desired compatibility with Ba(OH)2·8H2O. The phase separation of Ba(OH)2·8H2O was effectively inhibited by the MEG matrix and the supercooling temperature decreased from 13 °C for Ba(OH)2·8H2O to 2.4 °C for composite PCM with a MEG matrix density of 200 g/L. At the same matrix density, the thermal conductivity of composite PCM reached 3.58 W/(m K), 1.84 times higher than that of Ba(OH)2·8H2O. The latent heat was approximately equal to the product of the latent heat of Ba(OH)2·8H2O and its mass fraction. Moreover, the enthalpy loss of the composite PCM was negligible after 400 cycles, showing good thermal reliability.

AB - Latent thermal energy storage using phase change material (PCM) is an effective way to store and transport energy. In this work, expanded graphite was modified using octylphenol polyoxyethylene ether to generate modified expanded graphite (MEG), and then a novel shape-stabilized Ba(OH)2·8H2O/MEG composite PCM was synthesized by incorporating Ba(OH)2·8H2O into MEG matrix. Mass fractions of Ba(OH)2·8H2O in composite PCM were calculated from 74% to 93%. The effects of MEG on properties of PCM were investigated using scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and thermal constant analyzer. The results indicated that MEG had the desired compatibility with Ba(OH)2·8H2O. The phase separation of Ba(OH)2·8H2O was effectively inhibited by the MEG matrix and the supercooling temperature decreased from 13 °C for Ba(OH)2·8H2O to 2.4 °C for composite PCM with a MEG matrix density of 200 g/L. At the same matrix density, the thermal conductivity of composite PCM reached 3.58 W/(m K), 1.84 times higher than that of Ba(OH)2·8H2O. The latent heat was approximately equal to the product of the latent heat of Ba(OH)2·8H2O and its mass fraction. Moreover, the enthalpy loss of the composite PCM was negligible after 400 cycles, showing good thermal reliability.

KW - Ba(OH)2·8H2O

KW - Composite phase change material

KW - Modified expanded graphite

KW - Thermal energy storage

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U2 - 10.1016/j.solmat.2017.12.032

DO - 10.1016/j.solmat.2017.12.032

M3 - RGC 21 - Publication in refereed journal

SN - 0927-0248

VL - 179

SP - 339

EP - 345

JO - Solar Energy Materials and Solar Cells

JF - Solar Energy Materials and Solar Cells

ER -