Thermal and characteristic analysis of shape-stabilization phase change materials by advanced vacuum impregnation method using carbon-based materials

2019 ◽  
Vol 70 ◽  
pp. 281-289 ◽  
Author(s):  
Jongki Lee ◽  
Seunghwan Wi ◽  
Beom Yeol Yun ◽  
Seong Jin Chang ◽  
Sumin Kim
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Vacuum Impregnation ◽  
Impregnation Method ◽  
Characteristic Analysis ◽  
Stabilization Phase ◽  
Carbon Based

Sepiolite supported stearic acid composites for thermal energy storage

RSC Advances ◽  
2016 ◽  
Vol 6 (113) ◽  
pp. 112493-112501 ◽  
Author(s):  
Qiang Shen ◽  
Songyang Liu ◽  
Jing Ouyang ◽  
Huaming Yang
Keyword(s):  
Energy Storage ◽  
Stearic Acid ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Vacuum Impregnation ◽  
Impregnation Method ◽  
Composite Phase Change Materials

In this paper, novel composite phase change materials (PCMs) were prepared by absorbing stearic acid (SA) into sepiolite (α-sepiolite, β-sepiolite) via a vacuum impregnation method.

Polyethylene Glycol/Expanded Vermiculite Shape-Stabilized Composite Phase Change Materials for Thermal Energy Storage

2016 ◽  
Vol 847 ◽  
pp. 39-45
Author(s):  
Yong Deng ◽  
Jin Hong Li ◽  
Ting Ting Qian ◽  
Wei Min Guan ◽  
Xiang Wang
Keyword(s):  
Polyethylene Glycol ◽  
Phase Change ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Vacuum Impregnation ◽  
Impregnation Method ◽  
Scanning Calorimetry ◽  
Heating And Cooling ◽  
Expanded Vermiculite ◽  
Composite Phase Change Materials

Polyethylene glycol (PEG)/ expanded vermiculite (EVMT) shape-stabilized composite phase change material (ss-CPCM) was prepared by a facile vacuum impregnation method. The maximum mass percentage for PEG retained in ss-CPCM was 75.1 wt.% due to specific non-uniform flat layers pore structure of EVMT. The scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FT-IR) analysis results indicated that the melted PEG was adsorbed on the surface and completely dispersed into the pores of EVMT and no chemical changes took place during the heating and cooling processes. X-ray diffraction (XRD) results showed that the crystal structure of PEG was not destroyed after impregnation whereas the crystallization process of PEG was greatly restrained. Differential scanning calorimetry (DSC) results indicated that ss-CPCM melted at 57.61°C with a latent heat of 103.1 J/g and solidified at 33.19°C with a latent heat of 88.29 J/g. In addition, the thermal conductivity of ss-CPCM reached 0.418W/m K. The ss-CPCM can be considered as promising candidate materials for building applications due to their suitable phase change temperature, large latent heat and excellent chemical compatibility.

Diatomite/Palm Wax Composite as a Phase Change Material for Latent Heat Storage

2015 ◽  
Vol 1126 ◽  
pp. 33-38 ◽  
Author(s):  
Jan Fořt ◽  
Anton Trník ◽  
Milena Pavlíková ◽  
Zbyšek Pavlík
Keyword(s):  
Phase Change ◽  
Latent Heat ◽  
Building Materials ◽  
Phase Change Materials ◽  
Energy Savings ◽  
Heat Storage ◽  
Vacuum Impregnation ◽  
Impregnation Method ◽  
Latent Heat Storage ◽  
Polymer Encapsulation

Wider application of commercially produced phase change materials in production of building composites is limited due to their higher price and the inert polymer encapsulation which negatively affects mechanical parameters. This paper is focused on preparation of the composite material for energy savings. The phase change composite is prepared by soaking palm wax into the structure of diatomite powder using vacuum impregnation method. The compatibility of diatomite and palm wax in a newly developed PCM structure is investigated by FTIR spectroscopy. The improved thermal storage properties obtained by DSC analysis reveal melting temperature at 55.9°C and the phase change latent heat of 78.0 J/g. The laser diffraction based devise is used to determine the particle size distribution in order to assess the suitability of the developed wax/diatomite based composite for the cement based building materials. The obtained results indicate promising results from the point of view of improved latent heat storage at reasonable cost.

scholarly journals Thermal and Physical Characterization of PEG Phase Change Materials Enhanced by Carbon-Based Nanoparticles

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1168 ◽  
Author(s):  
David Cabaleiro ◽  
Samah Hamze ◽  
Jacek Fal ◽  
Marco A. Marcos ◽  
Patrice Estellé ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Surface Tension ◽  
Carbon Black ◽  
Phase Change ◽  
Phase Change Materials ◽  
Physical Characterization ◽  
Plastic Behavior ◽  
Diamond Nanopowders ◽  
Carbon Based

This paper presents the preparation and thermal/physical characterization of phase change materials (PCMs) based on poly(ethylene glycol) 400 g·mol−1 and nano-enhanced by either carbon black (CB), a raw graphite/diamond nanomixture (G/D-r), a purified graphite/diamond nanomixture (G/D-p) or nano-Diamond nanopowders with purity grades of 87% or 97% (nD87 and nD97, respectively). Differential scanning calorimetry and oscillatory rheology experiments were used to provide an insight into the thermal and mechanical changes taking place during solid-liquid phase transitions of the carbon-based suspensions. PEG400-based samples loaded with 1.0 wt.% of raw graphite/diamond nanomixture (G/D-r) exhibited the lowest sub-cooling effect (with a reduction of ~2 K regarding neat PEG400). The influences that the type of carbon-based nanoadditive and nanoparticle loading (0.50 and 1.0 wt.%) have on dynamic viscosity, thermal conductivity, density and surface tension were also investigated in the temperature range from 288 to 318 K. Non-linear rheological experiments showed that all dispersions exhibited a non-Newtonian pseudo-plastic behavior, which was more noticeable in the case of carbon black nanofluids at low shear rates. The highest enhancements in thermal conductivity were observed for graphite/diamond nanomixtures (3.3–3.6%), while nano-diamond suspensions showed the largest modifications in density (0.64–0.66%). Reductions in surface tension were measured for the two nano-diamond nanopowders (nD87 and nD97), while slight increases (within experimental uncertainties) were observed for dispersions prepared using the other three carbon-based nanopowders. Finally, a good agreement was observed between the experimental surface tension measurements performed using a Du Noüy ring tensiometer and a drop-shape analyzer.

Preparation of Energy Storage Ceramsite Manufactured from East Lake Sludge

2011 ◽  
Vol 287-290 ◽  
pp. 694-698
Author(s):  
Bao Guo Ma ◽  
Jun Wang ◽  
Yuan Yuan Wu ◽  
Wen Yang
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Latent Heat ◽  
Building Materials ◽  
Melting Process ◽  
Vacuum Impregnation ◽  
Impregnation Method ◽  
Combination Methods ◽  
East Lake ◽  
Lake Sludge

Phase change material (PCM) can absorb or release a large quantity of latent heat when it changes phase from solid state to liquid state or vice versa, and has very important applications in thermal energy storage systems. One of the combination methods is incorporating PCM in porous building materials, which are suitable matrix materials for PCM. In this paper, two kinds of ceramsite manufactured from East Lake sludge and paraffin were selected to form phase change composites by using the vacuum impregnation method. Differential scanning calorimeter (DSC) analysis was used to evaluate the phase change behavior. The result showed that the peak temperature (TP) and latent heat of the melting process of the paraffin in ceramsite A and B was a little higher than that of the bulk paraffin.

scholarly journals Evaluation of Energy Performance and Thermal Comfort Considering the Heat Storage Capacity and Thermal Conductivity of Biocomposite Phase Change Materials

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2191
Author(s):  
Su-Gwang Jeong ◽  
Taemin Lee ◽  
Jeonghun Lee
Keyword(s):  
Thermal Conductivity ◽  
Energy Consumption ◽  
Thermal Comfort ◽  
Phase Change ◽  
Chemical Stability ◽  
Phase Change Materials ◽  
Storage Capacity ◽  
Heat Storage ◽  
Building Energy ◽  
Vacuum Impregnation

The application of phase change materials (PCMs) has been verified as an effective strategy for improving energy efficiency and reducing greenhouse gas emissions. Biocomposite PCMs (Bc-PCM) exhibit large latent heat, chemical stability, and a wide temperature range. In this study, thermal conductivity improved Bc-PCM (TBc-PCM) was made via vacuum impregnation with graphene nanoplatelets (GNPs). Chemical stability analysis and thermal performance analyses of the Bc-PCM and TBc-PCM were carried out as well as building energy simulations and thermal comfort analyses. Our results show Bc-PCM showed a higher heat storage capacity and enthalpy value compared to TBc-PCM. TBc-PCM exhibited a 378% increase in thermal conductivity compared to Bc-PCM. Building energy simulation results revealed that annual heating and cooling energy consumption decreased as the thickness of the PCM layer increased. In addition, the Bc-PCM with a larger PCM capacity was more effective in reducing energy consumption during the heating period. On the other hand, the cooling energy reduction effect was greater when TBc-PCM with high thermal conductivity was applied because of the high heat transfer during the cooling period. Thermal comfort evaluation revealed it was more comfortable when PCM was applied.

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