Experimental study on a novel form-stable phase change materials based on diatomite for solar energy storage

Rao, Zhonghao; Zhang, Guangtong; Xu, Tao-Tao; Hong, Kun

doi:10.1016/j.solmat.2018.03.016

Cited by 84 publications

(17 citation statements)

References 51 publications

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“…Thermal conductivity is one of the most important parameters for any PCM because it determines the heat transfer efficiency of the PCM. The thermal conductivity of EGPG were investigated using a thermal conductivity tester (XIATECH, TC3000, Xian, China) based on the hot wire method [24]. Each reported value was the average of three samples, and the maximum standard deviation measured was less than 0.002 W/(m·K).…”

Section: Methodsmentioning

confidence: 99%

Thermal and Mechanical Properties of Expanded Graphite/Paraffin Gypsum-Based Composite Material Reinforced by Carbon Fiber

Zhang

Tian

et al. 2018

Materials

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Phase change material (PCM) is a kind of thermal energy storage material. Solid-liquid PCM composite materials must overcome the issues of material leakage and low thermal conductivity before they are suitable for widespread use in the fields of building and industry. In this study, porous expanded graphite (EG) is used as a carrier, which absorbs the PCM to fabricate EG/paraffin composites (EG/P) containing 90.6% paraffin, and a latent heat of up to 105.3 J/g was measured. Because gypsum board is widely used in buildings, therefore, EG/P composites are suitable to be integrated into gypsum to develop expanded graphite/paraffin gypsum-based composite material (EGPG) for thermal energy storage. In order to optimize the performance of EGPG, carbon fiber (CF) is used to reinforce their thermal and mechanical properties. The test results show that when 1 wt % CF is incorporated into the EGPG, the thermal conductivity increased 36.0%, and thus EGPG shows superior thermal control through the significantly increased efficiency of heat transfer. After 1 wt % CF was added, the flexural and compressive strength of EGPG were increased by 65.6% and 6.4%, respectively. The improved thermal and mechanical performance of EGPG modified by CF demonstrates that it is a structural-functional integrated building material suitable for building envelope system.

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Section: Methodsmentioning

confidence: 99%

Thermal and Mechanical Properties of Expanded Graphite/Paraffin Gypsum-Based Composite Material Reinforced by Carbon Fiber

Zhang

Tian

et al. 2018

Materials

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“…These biochars could be applied in agronomy for carbon sequestration due to their stability, and could also be utilized as a fuel owing to the high C content and high CV. The high thermal stability of biochars also shows their potential in energy engineering for developing of a supporting matrix used in organic PCMs that are used in heat storage systems 41 …”

Section: Resultsmentioning

confidence: 99%

A comparative study on synthesis and characterization of biochars derived from lignocellulosic biomass for their candidacy in agronomy and energy applications

et al. 2020

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Summary This study has dealt with the synthesis and characterization of biochars produced from three biomasses, viz. water hyacinth (whole plant and its components), yellow oleander, and sugarcane bagasse, and their comparative assessment for potential application in agronomy and energy production. The pyrolysis was carried out in a fixed batch reactor at 350°C and 550°C with a heating rate of 20°Cmin−1. Biochars were characterized for proximate and ultimate (elemental) analysis, and also using standard techniques (SEM, EDX, TGA, BET, XRD, and FTIR). Biochars produced at 550°C from all the feedstock had good properties (carbon content: 39.09‐80.74%, pH: 7.36‐10.42, calorific value: 16.98‐30.18 MJ kg−1, and ash content: 0.89%‐21.78%). Moreover, relatively low atomic ratios (H/C 0.25‐0.47 and O/C 0.15‐1.11) of all biochars indicated their potential as solid fuel. XRD results showed the presence of amorphous and crystalline structures, and minerals like sylivite, quartz, kalsilite, and tridymite in the biochar. Biochar produced from sugarcane bagasse at 550°C possessed the best properties: fixed carbon (77.42%), bulk density (0.13 kg/m3), brunauer–emmett–teller (BET) surface area (17.78 m2/g), pore size (12.86 nm), total pore volume (0.025 cm3/g), calorific value (30.18 MJ kg−1), ash content (1.16%), and moisture content (2.03%).

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“…Rao et al has prepared a novel form‐stable PCM composite. The thermal reliability test was performed, and the results showed that the thermal properties basically unchanged after 2000 thermal cycles . Lee et al combined EG with molten erythritol as composite PCM, and their thermal cycling tests demonstrated excellent thermal cycling stability .…”

Section: Introductionmentioning

confidence: 99%

Preparation and application of composite EG/Ba(OH)₂ ·8H₂ O form-stable phase change material for solar thermal storage

Han

Zhang

et al. 2019

Int J Energy Res

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Summary Composite expended graphite (EG)/Ba(OH)2·8H2O form‐stable phase change material (PCM) is prepared with porous adsorption method in this study to solve the problem of the leakage risk in the application process based on barium hydroxide octahydrate. In addition, the thermal properties and stability have been measured and verified. Thermal conductivity of each group composite material was enhanced by about two to four times, while the addition has little negative effect on the other properties. With microscopic features being characterized by scanning electron microscope (SEM), the experimental result demonstrates that the composite material with 7 wt% of EG is optimal to be a saturated state between two phases. After the thermal cyclings of 100, 300, and 500 times, thermal properties did not change dramatically, which can be used as an ideal material for solar thermal storage system within finite thermal cyclings. In order to simulate the operating condition of solar energy or waste heat storage, the composite material was encapsulated in the heat storage unit with pipe bundle, and heat storage/release experiences were performed to test the performance of the material and hot water supply. The results indicate that the composite material is qualified to storage and release sufficient heat. The experimental data can provide necessary technical reference for engineering design and effect prediction in practical application.

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Experimental study on a novel form-stable phase change materials based on diatomite for solar energy storage

Cited by 84 publications

References 51 publications

Thermal and Mechanical Properties of Expanded Graphite/Paraffin Gypsum-Based Composite Material Reinforced by Carbon Fiber

Thermal and Mechanical Properties of Expanded Graphite/Paraffin Gypsum-Based Composite Material Reinforced by Carbon Fiber

A comparative study on synthesis and characterization of biochars derived from lignocellulosic biomass for their candidacy in agronomy and energy applications

Preparation and application of composite EG/Ba(OH)₂ ·8H₂ O form-stable phase change material for solar thermal storage

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Experimental study on a novel form-stable phase change materials based on diatomite for solar energy storage

Cited by 84 publications

References 51 publications

Thermal and Mechanical Properties of Expanded Graphite/Paraffin Gypsum-Based Composite Material Reinforced by Carbon Fiber

Thermal and Mechanical Properties of Expanded Graphite/Paraffin Gypsum-Based Composite Material Reinforced by Carbon Fiber

A comparative study on synthesis and characterization of biochars derived from lignocellulosic biomass for their candidacy in agronomy and energy applications

Preparation and application of composite EG/Ba(OH)2 ·8H2 O form-stable phase change material for solar thermal storage

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Preparation and application of composite EG/Ba(OH)₂ ·8H₂ O form-stable phase change material for solar thermal storage