Enhanced Thermal Energy Storage Performance of Polyethylene Glycol by Using Interfacial Interaction of Copper‐Based Metal Oxide

Zhang, Haiquan; Yuan, Yanping; Sun, Qinrong; Cao, Xiaoling

doi:10.1002/adem.201600601

Cited by 21 publications

(9 citation statements)

References 30 publications

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“…When 5 wt % of Al 2 O 3 , Cu 2 O, and CuO was added to the PEG2000 organic, the energy storage density decreased to 141.2, 154, and 151.8 J g −1 , respectively. To investigate the crystal integrity, a parameter called the crystallization fraction ( F C ) is used and is given by:

F_{C} = \frac{Δ H_{C, C}}{β Δ H_{C, P}} \times 100

where Δ H C,C and Δ H C,P are the latent heat of the composite PCMs and pure PEG, respectively; and β represents the mass ratio of PEG in the composites . The F C of PEG/Al 2 O 3 (ii) sample is ∼96.1%.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon was observed for the reported PEG2000/Cu 2 O and PEG2000/CuO composites. Reversible hydrogen bonds appear on the interface between the PEG molecules and the copper‐based oxide . A comparison of the endothermal properties of the PEG polymers with those of the reported samples is shown in Table .…”

Section: Resultsmentioning

confidence: 99%

“…The Al 2 O 3 (ii) commercial product is composed of evenly distributed primary nanoparticles ∼100 nm in size as shown in Figure (b). Cu 2 O and CuO nano‐matrices were synthesized by adapting the procedure outlined by Zhang et al . Specifically, a 3 mol L −1 NaOH solution was slowly added dropwise into a 1 mol L −1 CuSO 4 solution with stirring for 30 min at room temperature to form a green Cu(OH) 2 gel.…”

Section: Methodsmentioning

confidence: 99%

“…The black CuO nanomaterial is composed of irregularly shaped particles with a maximum size of around 200 nm. The PEG/metal oxide composites were prepared by combining the metal oxide and the PEG2000 polymer with a mass ratio of 5:95 in ethanol and stirring together for 1 h at 70 °C . The resulting composites were labeled PEG/Al 2 O 3 (i), PEG/Al 2 O 3 (ii), PEG/Cu 2 O, and PEG/CuO, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Porosity reduction of polyethylene glycol phase change materials by using nanoscale thermal‐energy‐conducting medium during crystallization process

Zhang

Sun

Yuan

et al. 2017

J of Applied Polymer Sci

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Poly(ethylene glycols) (PEGs) are phase change materials (PCMs) that exhibit undesirable heat transfer properties, which restrict their industrial utility. Apart from the intrinsic material properties, a large quantity of micropores in the crystalline PEG polymers cause poor heat transfer performance. In this work, the formation and growth of micropores are reported through in situ characterization. The addition of a nanoscale thermal‐energy‐conducting medium into PCMs has been proposed for reducing their porosity. The mechanism for reducing porosity is reported for prepared composite PCMs. The intrinsic causes are thought to be the following. Metal oxide nanoparticles can migrate with the liquid PEG flow, which can reduce the thermal stresses in the crystal growth process. In addition, the nanoscale medium promotes heterogeneous nucleation. The results of this study show that reducing the porosity of the polymer crystals is an important approach for improving the heat transfer properties of the PEG PCMs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45446.

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F_{C} = \frac{Δ H_{C, C}}{β Δ H_{C, P}} \times 100

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Porosity reduction of polyethylene glycol phase change materials by using nanoscale thermal‐energy‐conducting medium during crystallization process

Zhang

Sun

Yuan

et al. 2017

J of Applied Polymer Sci

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“…It has favorable characteristics such as high latent heat storage capacity, thermal and chemical stabilities, biodegradation, no toxicity, no corrosiveness, no supercooling, low vapor pressure, and a suitable phase change temperature. The phase change temperature of PEG can be tuned by adjusting the molecular weight . The molecular weight of PEG ranges from 200 to 20 000.…”

Section: Solid–liquid Pcmsmentioning

confidence: 99%

Latent Heat Thermal Energy Storage Systems with Solid–Liquid Phase Change Materials: A Review

Zhang¹,

Yuan²,

Cao³

et al. 2018

Adv Eng Mater

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365

108

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This paper provides a review of the solid-liquid phase change materials (PCMs) for latent heat thermal energy storage (LHTES). The commonly used solid-liquid PCMs and their thermal properties are summarized here firstly. Two major drawbacks that seriously limit the application of PCMs in an LHTES system, that is, low thermal conductivity and liquid leakage, are discussed. Various methods for enhancing the thermal conductivity and heat transfer of solid-liquid PCMs are explained. Previous studies regarding formstable composite PCMs and microencapsulated PCMs are also presented. Furthermore, applications of the solid-liquid PCMs used in LHTES and thermal management systems are introduced and analyzed. Finally, future outlooks and research topics are proposed.

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Design of Radially Variant Phase‐Change Material Composites

et al. 2022

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Phase‐change materials (PCMs) and high‐conductivity elements can be combined to form highly compact and efficient composite heat sinks. However, the design challenge presented by thermal composites composed of PCMs and high‐conductivity elements remains unresolved. Herein, design guidelines are presented for radially varying cylindrical PCM composites. Numerical and analytical techniques are utilized to explore the utility and limits of optimal composite designs selecting for 1) temperature minimization, 2) specific effective heat capacity maximization, and 3) volumetric effective heat capacity maximization. Significant increases in each metric are observed when implementing radially variant designs in cylindrical geometries, especially for metrics of heat capacity. Furthermore, a hybrid approach to variant composite design is presented, allowing for the balancing of different design objectives. The utilization of a variable design under high heat flux (10 ± 1.4 W cm−2) and short melting periods (up to 50 s) is experimentally demonstrated, directly resulted in a 65% decrease in total system mass and a 200% increase in specific heat capacity while maintaining strong temperature dampening performance. In a second case study, a 23% decrease in mass is demonstrated while maintaining strong specific heat performance, emphasizing the broad utility of this approach.

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Enhanced Thermal Energy Storage Performance of Polyethylene Glycol by Using Interfacial Interaction of Copper‐Based Metal Oxide

Cited by 21 publications

References 30 publications

Porosity reduction of polyethylene glycol phase change materials by using nanoscale thermal‐energy‐conducting medium during crystallization process

Porosity reduction of polyethylene glycol phase change materials by using nanoscale thermal‐energy‐conducting medium during crystallization process

Latent Heat Thermal Energy Storage Systems with Solid–Liquid Phase Change Materials: A Review

Design of Radially Variant Phase‐Change Material Composites

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