Thermal performance of galactitol/mannitol eutectic mixture/expanded graphite composite as phase change material for thermal energy harvesting

Wang, Tao; Liu, Yang; Meng, Rui; Zhang, Mingfu

doi:10.1016/j.est.2020.101997

Cited by 55 publications

(19 citation statements)

References 47 publications

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“…Once the composite material has formed heat transfer pathways, even though there is a continuous increase in the addition of EG at the same degree, the increase in thermal conductivity of the composite material slows down. 35 2.3. Optimum Absorption Ratio of the CA-SA Eutectic Mixture and EG.…”

Section: Test Results Of Thermal Conductivitymentioning

confidence: 99%

“…However, EG is not added unlimitedly. Once the composite material has formed heat transfer pathways, even though there is a continuous increase in the addition of EG at the same degree, the increase in thermal conductivity of the composite material slows down …”

Section: Results and Discussionmentioning

confidence: 99%

“…Figure shows that the melting phase transition temperature of the CA-SA/EG composite phase change material is slightly lower than that of the CA-SA mixture, and the solidification phase transition temperature is slightly higher than that of the CA-SA mixture. It can be considered that the mixing of EG and CA-SA has a positive effect on the enhancement of heat transfer, with EG as thermally conductive pathways between the PCM layers, resulting in a faster phase transition. ,− As the mass fraction of EG increases, there is a corresponding reduction of the latent heat of the PCM, which indicates that the addition of EG does not contribute to the latent heat of phase change of the CA-SA mixture. When EG increases from 0 to 10 wt %, the average change rate of the latent heat of phase change during the endothermic melting process of the composite phase change material is 1.93%.…”

Section: Results and Discussionmentioning

confidence: 99%

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A Low-Temperature Phase Change Material Based on Capric-Stearic Acid/Expanded Graphite for Thermal Energy Storage

et al. 2021

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In this study, a capric acid (CA)-stearic acid (SA)/ expanded graphite (EG) composite phase change material (PCM) was prepared, and the optimum mass ratio of CA-SA is 0.84:0.16. The composite PCM was characterized by scanning electron microscopy, differential scanning calorimetry, and X-ray diffraction. It can be concluded that the CA-SA mixture was found to possess good compatibility with EG, the thermal conductivity of the CA-SA/10 wt % EG composite PCM was 3.28 times higher than that of the CA-SA mixture, and the PCM thermal stability was satisfactory; no leakage occurred in the CA-SA/10 wt % EG composite PCM. The PCM has good thermal reliability after 500 thermal cycles. Finally, it is shown that the CA-SA/10 wt % EG composite PCM showed excellent performance, and therefore, it can be used for low-temperature thermal energy storage.

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Section: Test Results Of Thermal Conductivitymentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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A Low-Temperature Phase Change Material Based on Capric-Stearic Acid/Expanded Graphite for Thermal Energy Storage

et al. 2021

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“…The broad absorption bands at 3591 to 3016 cm À1 in the FTIR spectral of DM were attributed to the stretching vibration of OH, and the characteristic peak at 2939.4 cm À1 was attributed to the stretching vibration of CH. 26,32 The characteristic transmission band at 1410 to 1100 cm À1 belongs to the in-plane bending vibration of OH and the stretching vibration of the C O, 33,34 and at 3288.5 cm À1 of CPCM is the association peak of the hydrogen bond formed by the hydroxyl group. The infrared peak of CPCM contains all the characteristic diffraction peaks of KBr-DM and EG with no new peaks were formed.…”

Section: Composition and Structure Analysismentioning

confidence: 99%

D‐mannitol‐based eutectic composite phase change materials with high thermal conductivity and solar‐thermal conversion

Bai

Qiu

Wang

2022

Intl J of Energy Research

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Summary At present, there are few kinds of phase change materials that suitable for medium temperature heat storage. Among them, sugar alcohols have broad application prospects in the heat storage at medium temperature due to their suitable phase transition temperature. In this work, eutectic phase change material (PCM) was prepared with D‐mannitol as PCM and KBr as melting point modifier. Expanded graphite (EG) was used as thermally conductive support network to prepare shape‐stable composite phase change material (CPCM). The prepared CPCM—10% EG/PCM has an appropriate phase transition temperature (136.88°C), high phase melting enthalpy (215.7 J/g), and good photothermal conversion (81.9%). The thermal conductivity of 10% EG/PCM reached 6.01 W/(m K), which is approximately 10 times higher than D‐mannitol (0.603 W/(m K)). Because of its excellent thermal properties, the applications of CPCM in energy storage and photothermal conversion can be further broadened.

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“…Phase change materials (PCMs) are key components in LHTES systems. These materials are also capable of storing and releasing high enthalpy at the proper temperatures during the phase change cycle. − Paraffins, fatty acids, fatty alcohols, inorganic salts, and their eutectic mixtures are commonly used PCMs for LHTES applications. − The advantages of PCMs in LHTES systems are low corrosivity, market availability with low cost, high strength, and nontoxicity. PCMs are also compatible with the utilized surfaces and can be used without phase separation and small or no volumetric expansion. , Moreover, thermal conductivity is one of the basic criteria considered in the selection of proper PCM for TES implementations.…”

Section: Introductionmentioning

confidence: 99%

CuO Nanoparticle@Polystyrene Hierarchical Porous Foam for the Effective Encapsulation of Octadecanol as a Phase Changing Thermal Energy Storage Material

2022

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CuO nanoparticle-doped hierarchical porous polymeric frameworks can be used for shape stability of octadecanol (OD) as a phase change material (PCM) for latent heat energy storage (LHTES) applications. A hierarchical porous foam polymer was synthesized by high internal phase emulsion polymerization of styrene and divinylbenzene doped with/without CuO. The synthesized high internal phase templated polymers (PHPs) with hierarchical pores were capable of absorbing up to 75 wt % OD without seepage behavior. The morphological, structural, and thermal behavior of PHPs/OD and PHPs@CuO/OD composite PCMs was determined using scanning electron microscopy (SEM)/energy-dispersive X-ray analysis (EDX), Brunauer–Emmett–Teller (BET) surface area analyses, Fourier transform infrared spectrophotometry (FT-IR), differential scanning calorimetry (DSC) analysis, and thermogravimetric analysis. Thermal analysis results revealed that PHP containing 75 wt % OD has an LHTES capacity of 190.4–194.0 J/g in the temperature range of 52.0–53.0 °C. The chemical and thermal stabilities of the developed composite PCMs were tested with repetitive thermal cycles. After 0.25 wt % CuO nanoparticle doping, the thermal conductivity of the composite PCM increased up to 86 and 17% compared to PHP and pure OD, respectively. Heat storage/releasing times of PHP@CuO/OD reduced about 20–22% relative to those of PHP/OD because of improved thermal conductivity. The thermal stability of PHP/OD and PHP@CuO/OD composites increased from 196 to 278 °C and 251 °C, respectively, compared to pure OD. The results exposed that especially PHP@CuO/OD composite PCMs are good candidates for LHTES applications because of their considerably high LHTES capacity.

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Thermal performance of galactitol/mannitol eutectic mixture/expanded graphite composite as phase change material for thermal energy harvesting

Cited by 55 publications

References 47 publications

A Low-Temperature Phase Change Material Based on Capric-Stearic Acid/Expanded Graphite for Thermal Energy Storage

A Low-Temperature Phase Change Material Based on Capric-Stearic Acid/Expanded Graphite for Thermal Energy Storage

D‐mannitol‐based eutectic composite phase change materials with high thermal conductivity and solar‐thermal conversion

CuO Nanoparticle@Polystyrene Hierarchical Porous Foam for the Effective Encapsulation of Octadecanol as a Phase Changing Thermal Energy Storage Material

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