Preparation and Thermal Characterization of Nitrates/Expanded Graphite Composite Phase-Change Material for Thermal Energy Storage

Li, Y.; Li, P.; Zhu, Qunzhi; Li, Q. F.

doi:10.1007/s10765-016-2116-3

Cited by 17 publications

(4 citation statements)

References 19 publications

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“…It is one of the most popular materials for PCM modification. 41,42 Li et al 43 prepared CPCMs by mixing EG with lithium-potassium nitrate. The results showed that the addition of EG greatly improved the thermal conductivity of the CPCMs, and the thermal conductivity was even up to 8 times higher than that of pure PCMs.…”

Section: Introductionmentioning

confidence: 99%

Preparation, thermal storage properties and application of sodium acetate trihydrate/expanded graphite composite phase change materials

Wang,

Yan,

Meng

et al. 2023

Dalton Trans.

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Section: Introductionmentioning

confidence: 99%

Preparation, thermal storage properties and application of sodium acetate trihydrate/expanded graphite composite phase change materials

Wang,

Yan,

Meng

et al. 2023

Dalton Trans.

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“…25 EG, in particular, garners additional attention from fundamental and scientific perspectives due to its demonstrated thermophysical stability. Li et al 17 used a static mixed melting method to make an EG-based binary eutectic composite (LiNO 3 + KNO 3 ). They observed that the inclusion of EG particles increased the thermal conductivity of the composite PCM (ie, at 30% EG loading) by 16 times as compared with the PEPCM salt.…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation studies and hybrid neural network modelling of eutectic phase change material composites

Balasubramanian

Kottala

Prabhakaran

et al. 2022

Intl J of Energy Research

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Summary Using a thermogravimetric analyzer, the thermal stability of pure eutectic phase change material (PEPCM) (LiNO3 + NaCl) and composite eutectic PCM (CEPCM) mixture (ie, PCM containing 9% expanded graphite [EG]) was examined. PEPCM and CEPCM degradation kinetics were studied using model free kinetics methods. The activation energy of both PCM samples was evaluated using the Kissinger‐Akahira‐Sunose (KAS), Flynn‐Wall‐Ozawa (FWO), Starink, Friedman and Vyazovkin kinetic models. The calculated activation energies for Vyazovkin, Frideman, Ozawa, KAS and Starink techniques for PEPCM were 80.62‐149.2, 108.1‐180.18, 83.74‐136.17, 73.55‐127.02 and 74.64‐149.9 kJ/mol, respectively. Likewise, the activation energy of CEPCM vary between 59.4‐161.41, 83.97‐188.69, 57.1‐147.32, 54.19‐137.43 and 55‐160.65 kJ/mol. Hybrid neural networks such as ANN‐PSO and ANFIS were used to model the degradation of PCM samples. The type of PCM, the heating rate, and the temperature were applied as input parameters, while the sample's mass loss was utilized as an output parameter. The created hybrid models are capable of effectively predicting experimental TGA data.

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“…Currently, researchers are interested for the improvement of the thermal conductivity of PCM, especially with the additive of EG. Y. Li et al [4] used the EG to enhance the thermal conductivity of binary nitrates. The result showed that thermal conductivity of nitrate was increased to 8 times by adding 10% EG and recommended that EG is a good one to enhance thermal conductivity for PCM.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Expanded Graphite on the Charging Time of Stearic Acid Phase Change Material in a Hot Water Tank

Sett

Mon

2021

AEJ

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The present work is to investigate the thermal conductivity of the phase change material (PCM) of stearic acid (SA) by using the supporting material of expanded graphite (EG). The EG is used with the mass ratio of 10%, 15% and 20%. SA is commercial grade and the EG is formed by thermal method using natural graphite powder and crystalline zinc nitrate. The composite materials of (SA/10% EG, SA/15% EG and SA/20% EG) are prepared by direct impregnation method. Thermal conductivity of pure SA and composite PCMs are investigated by laboratory apparatus of heat transfer base unit TD1002. The thermal conductivity of the SA/10%EG composite PCM has been improved to 0.64 W/mK from that of SA (0.28 W/mK) with the percentage enhancement of 129%. To verify the morphology of the materials, scanning electron microscopy (SEM) analysis is utilized. The results show that the EG is formed in multilayers with pores in which stearic acid is well absorbed. The charging characteristics of pure SA, SA/10% EG and SA/15% EG for low temperature latent heat storage (LHS) system are studied experimentally. The system is applied for domestic water heating. The PCM is filled in a 33 mm diameter cylindrical copper tube and placed in hot water storage tank. The water is filled in tank from the top section through the distributor to uniform entry. The phase change phenomena of the PCMs are measured by inserting thermocouples at two layers of PCM tube. The result shows that the melting time decreases with the increasing mass ratio of expanded graphite in composite PCM. Although the melting time of both layers are nearly the same at the experiment of composite PCMs, the lower layer takes longer time than upper layer for pure PCM. The charging time is decreased by 67% for SA/10%EG and 79% for SA/15% EG composite PCM from that value of pure SA.

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Preparation and Thermal Characterization of Nitrates/Expanded Graphite Composite Phase-Change Material for Thermal Energy Storage

Cited by 17 publications

References 19 publications

Preparation, thermal storage properties and application of sodium acetate trihydrate/expanded graphite composite phase change materials

Preparation, thermal storage properties and application of sodium acetate trihydrate/expanded graphite composite phase change materials

Thermal degradation studies and hybrid neural network modelling of eutectic phase change material composites

The Effect of Expanded Graphite on the Charging Time of Stearic Acid Phase Change Material in a Hot Water Tank

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