Ag-graphene/PEG composite phase change materials for enhancing solar-thermal energy conversion and storage capacity

Zhang, Yuang; Wang, Jiasheng; Qiu, Jing Hui; Jin, Xin; Umair, Malik Muhammad; Lu, Rongwen; Zhang, Shufen; Tang, Bingtao

doi:10.1016/j.apenergy.2018.12.075

Cited by 314 publications

(108 citation statements)

References 42 publications

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“…This temperature range is very useful for commercial applications such as solar drying and water heating in different industrial and domestic applications. Few PEGs have been used as base material for producing composite PCMs for TES purposes in past recent studies . Many previous studies have investigated the variation in thermal properties of fatty acids and other organic PCMs but to the authors' best knowledge, none has reported the data pertaining to variation in thermal properties of PEGs subjected to repetitive thermal cycle test.…”

Section: Introductionmentioning

confidence: 99%

“…Few PEGs have been used as base material for producing composite PCMs for TES purposes in past recent studies. [26][27][28][29] Many previous studies have investigated the variation in thermal properties of fatty acids and other organic PCMs but to the authors' best knowledge, none has reported the data pertaining to variation in thermal properties of PEGs subjected to repetitive thermal cycle test. So, there is a need to evaluate the behavior of these potential candidates during thermal cycling environment and to test their suitability as potential TES materials.…”

Section: Introductionmentioning

confidence: 99%

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A cycling study for reliability, chemical stability and thermal durability of polyethylene glycols of molecular weight 2000 and 10000 as organic latent heat thermal energy storage materials

et al. 2019

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Summary In this experimental study, thermal aging test for investigating the variations in thermal and chemical properties of two selected organic phase change materials (PCMs) has been carried out. Polyethylene glycols (PEGs) of molecular weight of 2000 and 10 000 have been considered as potential latent heat thermal energy storage (LHTES) materials for investigation. The aim of this study is to identify the probable variations in thermal properties and chemical structures of PEGs after melting/freezing cycles repeated for 1500 times. The differential scanning calorimetry (DSC) technique was adopted for measuring the thermal properties such as melting point and latent heat of PCMs. In order to study the variations in PCM's chemical functional groups, Fourier transform infrared (FT‐IR) spectroscopy was used. Thermal durability property after the cycling test was investigated using thermogravimetric analysis. The DSC measurements indicated that PEG2000 experienced a maximum variation of about 4°C in melting point while the latent heat of fusion reduces by 16% after the cycle test. PEG10000 shows a variation of about 0.3°C in melting point and 15% of the latent heat of melting after the entire cycle test. The spectral investigation confirms that there are no variations in the functional groups of selected materials after cycle test, which can be inferred as chemical stability of them. The thermal gravimetric analysis curves show that both PEGs are thermally quite durable as well after such large number of melt/freeze cycles. Thermal cycling results and economic analysis confirm that both PEGs are potential PCMs for passive solar thermal management purposes. Highlights Synthesis of polyethylene glycol‐based binary eutectic mixtures. Accelerated thermal cycle test of eutectic mixtures. Binary mixtures were found chemically stable. Charging/discharging rates of PEG are controlled. Novelty Statement This paper presents the thermal performance of two polyethylene glycols, viz., PEG2000 and PEG10000. These materials were melted and solidified 1500 times for testing their suitability as thermal energy storage materials, and it was found that these materials are stable enough to store solar energy for five years. They found to be suitable for many solar energy storage applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A cycling study for reliability, chemical stability and thermal durability of polyethylene glycols of molecular weight 2000 and 10000 as organic latent heat thermal energy storage materials

et al. 2019

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“…The broad absorption peak at 3,434 cm −1 corresponds to the stretching vibration peak of hydroxyl groups. Stretching vibrations of C=O were observed at 1,112 cm −1 . The peak at 1,468 cm −1 corresponds to the bending vibration peak of –CH 2 – .…”

Section: Resultsmentioning

confidence: 94%

Thermally Conductive and Shape‐Stabilized Polyethylene Glycol/Carbon Foam Phase‐Change Composites for Thermal Energy Storage

et al. 2020

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Phase‐change materials (PCMs) have been widely investigated as candidates for thermal energy storage and solar thermal energy conversion. However, low thermal conductivity and poor shape stability during phase transition processes are detrimental to their practical applications. In this study, we designed composite PCMs based on carbon foam (CF) via the vacuum impregnation method to overcome these problems. CF with 3D interconnected microporous structures and good compressive strength was fabricated from phenolic resin (PF) using a combined process of carbonization and sacrificial template techniques. The developer material is considered a promising support material for PCMs. The as‐prepared polyethylene glycol/CF composite (PCC) exhibited a high energy‐storage density with a melting enthalpy of 135.7 J/g, and the thermal conductivity was enhanced by 109.8% compared to that of pure polyethylene glycol. In addition, the PCC showed excellent thermal stability and leakage‐proof performance after 100 heating/cooling cycles and good compressive strength. Because of the simple preparation process and low cost, PCC is a promising material for various thermal energy storage applications, especially in building energy storage systems.

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“…Concentrated solar energy systems with energy storage sources could smooth out the short-term transients and the gap between energy supply and demand in space and time. Phase change materials (PCMs) are a kind of high-phase material, which can store energy in the mode of latent heat with a narrow temperature range, providing greater energy storage density [4,5] . Therefore, PCMs are suitable in energy storage systems [6].…”

Section: Introductionmentioning

confidence: 99%

Electrospun Polyethylene Glycol/Polyvinyl Alcohol Composite Nanofibrous Membranes as Shape-Stabilized Solid–Solid Phase Change Materials

Huang

Abdalkarim

et al. 2020

Adv. Fiber Mater.

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In this work, shape-stabilized solid-solid phase change materials (PCMs) were fabricated by simply electrospinning polyethylene glycol (PEG) and polyvinyl alcohol (PVA). Owing to the strong hydrogen bonds and entanglement between those molecular chains of PEG and PVA, PEG was packaged by PVA. The morphological structures, thermal stability and thermal energy storage properties of those fibers were investigated. SEM results showed that those electrospun PVA/PEG composite membranes hold a three-dimensional nonwoven web structure even the content of PEG as high as 70%. The thermal energy storage ability of those composite fibers increased with the increase of the content of PEG. The heat enthalpies of PEG/ PVA = 7/3 were as high as 78.806 J/g. Moreover, those composite fibers had excellent thermal stability. After 100 heating and cooling cycles, there was almost no obvious change in the melting enthalpy and crystallization enthalpy. Those fibers still maintained good thermal regulation. The simple preparation process, low cost of raw materials and excellent stability endow the PCMs great utilization potentiality in smart textile and energy storage systems.

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Ag-graphene/PEG composite phase change materials for enhancing solar-thermal energy conversion and storage capacity

Cited by 314 publications

References 42 publications

A cycling study for reliability, chemical stability and thermal durability of polyethylene glycols of molecular weight 2000 and 10000 as organic latent heat thermal energy storage materials

A cycling study for reliability, chemical stability and thermal durability of polyethylene glycols of molecular weight 2000 and 10000 as organic latent heat thermal energy storage materials

Thermally Conductive and Shape‐Stabilized Polyethylene Glycol/Carbon Foam Phase‐Change Composites for Thermal Energy Storage

Electrospun Polyethylene Glycol/Polyvinyl Alcohol Composite Nanofibrous Membranes as Shape-Stabilized Solid–Solid Phase Change Materials

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