Review on solid-solid phase change materials for thermal energy storage: Molecular structure and thermal properties

Fallahi, Ali; Guldentops, Gert; Tao, Mingjiang; Granados-Fócil, Sergio; Dessel, Steven Van

doi:10.1016/j.applthermaleng.2017.08.161

Cited by 340 publications

(172 citation statements)

References 70 publications

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“…This motivates a search for materials with solid–solid phase transformations having a high value of latent heat. Some iron cobalt and iron nickel alloys exhibit phase transitions with enthalpy of around 50 kJ kg −1 ; however, this is insufficient to make them competitive for the wire scanner application. Greater values of solid‐state enthalpy change can be achieved in organic materials, but these would be unsuitable due to volatility under vacuum.…”

Section: Discussionmentioning

confidence: 99%

Wire Materials for Scanners in the Large Hadron Collider: An Unusual Materials Selection Problem

Bigland

Huber

Veness³

et al. 2019

Adv Eng Mater

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The transverse distribution of particles in the hadron beam of the Large Hadron Collider (LHC) is measured using wire scanners that pass a thin wire through the hadron beam and detect scattered radiation. Increasing demands on beam instrumentation in the LHC leads one to consider the choice of material for the wire. Here, it is shown that this material choice depends on thermal, mechanical, and radiation scattering properties. Simple analytical models are used to develop an Ashby material index for the design problem. It is confirmed that carbon fibers, currently used in several scanners, are high‐performing materials for this application. The key compromises in the material choice are identified. Notably, thermal conductivity and emissivity are relatively unimportant, whereas heat capacity, tolerance of high temperature, and mechanical strength dominate the material index. Potential competitor materials are identified, along with directions to pursue for performance enhancement.

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Section: Discussionmentioning

confidence: 99%

Wire Materials for Scanners in the Large Hadron Collider: An Unusual Materials Selection Problem

Bigland

Huber

Veness³

et al. 2019

Adv Eng Mater

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“…Thus, the energy storage characteristics of polymeric S‐SPCMs can be varied depending on types/structures and movement freedom of soft segments. In this regard, various polymeric S‐SPCMs have been prepared via polymerization of S‐LPCMs (fatty acids and alcohols) with proper polymers . On the other hand, polyethylene glycols (PEGs) have phase change temperatures in wide range and heat storage capacity depending on the molecular weight besides nontoxicity and low vapor pressure .…”

Section: Introductionmentioning

confidence: 99%

Thermal energy storage properties of polyethylene glycol grafted styrenic copolymer as novel solid‐solid phase change materials

2020

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Summary Polymeric solid‐solid phase change materials (S‐SPCMs) are functional materials with phase transition‐heat storing/releasing ability. With this respect, a series of polyethylene glycol (PEG) grafted styrenic copolymer were produced as novel S‐SPCMs. PEGs with three different molecular weights were used for synthesis of isocyanate‐terminated polymers (ITPs). To achieve cross‐linking S‐SPCMs, the ITPs were grafted with styrene‐co‐ally alcohol) (PSAA) at three different PSAA:PEG mole ratios. The produced polymers were characterized using Fourier transform infrared (FT‐IR), proton nuclear magnetic resonance (1H NMR), and X‐ray diffraction (XRD) technique. The crystalline‐amorphous phase transitions of the polymers were examined using polarized optical microscopy (POM). The FT‐IR, NMR, and XRD results confirmed the expected chemical structures and crystallization performances of the polymers. Thermal energy storage (TES) properties of the S‐SPCMs were determined by differential scanning calorimetry (DSC). The DSC results revealed that the polymers with grafting ratio of PSAA:PEG(1:1) had phase transition enthalpies between about 74 and 142 J/g and phase transition temperatures between about 26°C and 57°C. Thermogravimetric analysis (TGA) measurements demonstrated that the S‐SPCMs were resistant to thermal decomposition until about 300°C. Thermal conductivities of the produced S‐SPCMs were measured in a range of about 0.18 to 0.19 W/mK. Furthermore, TES properties of the S‐SPCMs were slightly changed as their chemical structures were remained after 5000 thermal cycles. By overall evaluation of the findings, it can be foreseen that particularly PSAA‐g‐PEG(1:1) polymers can be considered as promising S‐SPCMs for some TES practices such as air conditioning of buildings, thermoregulation of food packages, automobile components, electronic devices, and solar photovoltaic panels.

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“…Porous titanium dioxide (TiO 2 ) is an important inorganic supporting material for composite PCMs, owing to its specific surface area, unique pore structure, high thermal stability, nontoxicity, fire resistance, and low density . However, composite PCMs still suffered from low thermal conductivity, which affects thermal transport performance …”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal conductivity of copper‐doped polyethylene glycol/urchin‐like porous titanium dioxide phase change materials for thermal energy storage

et al. 2019

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Summary A composite phase change material (PCM) of copper‐doped polyethylene glycol (PEG) 2000 impregnated urchin‐like porous titanium dioxide (TiO2) microspheres (PEG/TiO2) was successfully synthesised. The urchin‐like porous TiO2 structures contain hollow cavities that can provide a high PEG loading capacity of up to 80 wt%. Copper nanoparticles were uniformly dispersed on the outer and inner surfaces of the 0.8PEG/TiO2 as additives to enhance the thermal conductivity of the composite PCM. The latent heat of the Cu/PEG/TiO2 porous composite PCM reached 133.8 J/g, and the thermal conductivity was 0.58 W/(mK), which was 152.2% higher than that of TiO2 and 38.1% higher than 0.8PEG/TiO2. Moreover, the Cu/PEG/TiO2 porous composite PCM has excellent thermal stability and reliability.

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Review on solid-solid phase change materials for thermal energy storage: Molecular structure and thermal properties

Cited by 340 publications

References 70 publications

Wire Materials for Scanners in the Large Hadron Collider: An Unusual Materials Selection Problem

Wire Materials for Scanners in the Large Hadron Collider: An Unusual Materials Selection Problem

Thermal energy storage properties of polyethylene glycol grafted styrenic copolymer as novel solid‐solid phase change materials

Enhanced thermal conductivity of copper‐doped polyethylene glycol/urchin‐like porous titanium dioxide phase change materials for thermal energy storage

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