Research on the Thermo Physical Properties of Lauric Acid-Capric Acid Binary Mixture Phase Change Materials

2012 ◽  
Vol 226-228 ◽  
pp. 1704-1708
Author(s):  
Quan Zhou ◽  
Yi Zhang ◽  
Hong Bin Guo ◽  
Qing Hai Li ◽  
Dong Xu Li
Keyword(s):  
Thermal Conductivity ◽  
Fatty Acid ◽  
Binary Mixture ◽  
Phase Change ◽  
Melting Temperature ◽  
Binary Mixtures ◽  
Latent Heat ◽  
Lauric Acid ◽  
Capric Acid ◽  
Heating And Cooling

Lauric acid(LA) and capric acid(CA) were mixed into binary mixture, whose melting temperature was predicted with Schroder’s equation and tested in step cooling curve method. Then latent heat was tested by DSC, and T-history method was used to test thermal conductivity of binary mixtures, heating and cooling characteristics were studied through expanded perlite(EP) adsorption of binary mixtures. Results show that Schroder’s equation can be used to predict melting temperature of fatty acid, and binary mixture prepared of 6:4 molar ratio has a high latent heat and its temperature is within a range that meets indoor comfort temperature. Thermal conductivity and the heating and cooling characteristics of the mixtures reveals that the thermal conductivity of fatty acid phase change material(PCM) is low, which restricts its latent heat release rate.

Preparation and Characterization of Capric-Lauric Acid/Silicon Dioxide Nanocapsules as Phase Change Energy Storage Materials

2021 ◽  
Vol 13 (4) ◽  
pp. 632-637
Author(s):  
Lin Xing ◽  
Yong-Sheng Yu ◽  
Xiang-Hong Ge ◽  
Lin-Feng Yang
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Latent Heat ◽  
Lauric Acid ◽  
Eutectic Mixture ◽  
Capric Acid ◽  
Core Material ◽  
Energy Storage Materials ◽  
Phase Identification ◽  
X Ray Diffraction

Capric acid (CA)-lauric acid (LA)/silica (SiO2) nanocapsules were fabricated in this paper. The core material was acted by CA-LA eutectic mixture, and the shell material was supported by SiO2. The phase identification, chemical composition, micrograph, and thermal property of as-prepared samples were analyzed based on X-ray diffraction, Fourier transformation infrared spectroscope, Scanning electron microscope and Differential scanning calorimety, respectively. These results displayed that CA-LA eutectic mixture was well encapsuled into SiO2 pore network. The CA-LA/SiO2 nanocapsules were spherical with uniform particle size of about 100 nm. When the mole proportion of CA:LA was 65:35, the phase transition temperature of nanocapsules was measured as 18.98 °C, and latent heat was confirmed as 83.06 J/g. The phase change temperature of the nanocapsules was basically consistent with the calculation value of pure CA-LA eutectic, and latent heat was about 58% of the theoretical value, signifying a high encapsulation efficiency. Therefore, CA-LA/SiO2 nanocapsules as PCMs could provide thermal energy storage for buildings.

Preparation and Properties of Capric-Lauric-Palmitic Acid Eutectic Mixtures/Expanded Graphite Composite as Phase Change Materials for Energy Storage

2014 ◽  
Vol 1028 ◽  
pp. 40-45 ◽  
Author(s):  
Xue Huang ◽  
Yling De Cui ◽  
Bu Ning Zhang ◽  
Guo Qiang Yin ◽  
Guang Zhu Feng
Keyword(s):  
Thermal Conductivity ◽  
Phase Change ◽  
Melting Temperature ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Ternary Eutectic ◽  
Eutectic Mixture ◽  
Expanded Graphite ◽  
Mass Ratio ◽  
Eutectic Mixtures

This work is focused on the preparation and properties of ternary fatty acid eutectic mixtures/ expanded graphite form-stable phase change materials (PCMs). Based on the theoretical calculation of the mass ratio and ternary eutectic melting temperature, the ternary eutectic mixture of capric acid (CA), lauric acid (LA) and palmitic acid (PA) was prepared firstly, which is for the sake of decreasing the phase transformation temperature. Thermal characteristics such as melting temperature and latent heat of fusion of these developed eutectics measured by using Differential Scanning Calorimetry (DSC) technique, which also showed that the eutectic mixture was composed by CA, LA and PA in the mass ratio of 59.7:30.1:10.02. Then the CA–LA–PA was absorbed in expanded graphite (EG), which acts as a supporting material, the optimum mass ratio of CA–LA–PA to EG is 17:1. The CA–LA–PA/EG composites were characterized by the scanning electronic microscope (SEM), differential scanning calorimeter (DSC). The SEM observations showed that the CA–LA–PA was adsorbed into the porous structure of EG, instead of any chemical action. The DSC results indicated that the phase change temperature and latent heat of the CA–LA–PA and CA–LA–PA/EG were 19.92 °Cand 19.48 °C, and 135.49 J/g and 130.73 J/g respectively. The thermal conductivity of CA–LA–PA /EG composite PCM was improved by the high thermal conductivity of the EG. Thermal cycling test showed that the CA–LA–PA/EG composite had a good thermal reliability. All results indicated that CA–LA–PA/EG composite PCM has a proper melting temperature and latent heat for building energy conservation.

scholarly journals pH-controlled synthesis of sustainable lauric acid/SiO2 phase change material for scalable thermal energy storage

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shafiq Ishak ◽  
Soumen Mandal ◽  
Han-Seung Lee ◽  
Jitendra Kumar Singh
Keyword(s):  
Electron Microscopy ◽  
Phase Change ◽  
Lauric Acid ◽  
Photoelectron Spectroscopy ◽  
Phase Change Materials ◽  
Precursor Solution ◽  
Thermal Reliability ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Heating And Cooling

AbstractLauric acid (LA) has been recommended as economic, eco-friendly, and commercially viable materials to be used as phase change materials (PCMs). Nevertheless, there is lack of optimized parameters to produce microencapsulated PCMs with good performance. In this study, different amounts of LA have been chosen as core materials while tetraethyl orthosilicate (TEOS) as the precursor solution to form silicon dioxide (SiO2) shell. The pH of precursor solution was kept at 2.5 for all composition of microencapsulated LA. The synthesized microencapsulated LA/SiO2 has been characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-Ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM). The SEM and TEM confirm the microencapsulation of LA with SiO2. Thermogravimetric analysis (TGA) revealed better thermal stability of microencapsulated LA/SiO2 compared to pure LA. PCM with 50% LA i.e. LAPC-6 exhibited the highest encapsulation efficiency (96.50%) and encapsulation ratio (96.15%) through Differential scanning calorimetry (DSC) as well as good thermal reliability even after 30th cycle of heating and cooling process.

Thermal Conductivity Enhancement in a Latent Heat Storage Device

2013 ◽  
Vol 860-863 ◽  
pp. 590-593
Author(s):  
Cha Xiu Guo ◽  
Ding Bao Wang ◽  
Gao Lin Hu
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Solid State ◽  
Liquid Phase ◽  
Phase Change ◽  
Latent Heat ◽  
Heat Storage ◽  
Storage Device ◽  
Latent Heat Storage ◽  
Conductivity Enhancement

High conductivity porosity materials are proposed to enhance the phase change materials (PCM) in order to solve the problem of low conductivity of PCM in the latent heat storage device (LHSD), and two-dimensional numerical simulation is conducted to predict the performance of the PCM by CFD software. During the phase change process, the PCM is heated from the solid state to the liquid phase in the process of melting and from the liquid phase to the solid state in the solidification process. The results show that porosity materials can improve heat transfer rate effectively, but the effect of heat transfer of Al foam is superior to that of graphite foam although the heat storage capacity is almost the same for both. The heat transfer is enhanced and the solidification time of PCM is decreased since the effective thermal conductivity of composite PCM is increased.

Lauric acid/bentonite/flake graphite composite as form-stable phase change materials for thermal energy storage

2020 ◽  
Vol 10 (2) ◽  
pp. 214-224 ◽  
Author(s):  
Songyang Liu ◽  
Jie Han ◽  
Qingjie Gao ◽  
Wenze Kang ◽  
Ruichen Ren ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Lauric Acid ◽  
Stable Phase ◽  
Impregnation Method ◽  
Flake Graphite ◽  
Graphite Composite

The main purpose of this paper was to synthesize a novel form-stable composite phase change material (PCM). Herein, bentonite-based PCMs were synthesized by impregnating Na-bentonite clay with lauric acid (LA) through a vacuum impregnation method. Flake graphite (FG) was used to enhance the thermal conductivity of the composite PCMs. In addition, FG also helped block the leakage of the PCMs. It is worth noting that with the addition of FG, the period of melting and solidifying of composite PCMs were decreased to some extent. Meanwhile, the thermal conductivity of the PCMs has been obviously improved. Moreover, the synthesized composite PCM exhibited a favorable performance of reliability after 200 thermocycling test. Hence, this study showed that the developed composite PCM has the potential to be applied in thermal energy storage systems.

Non-Isothermal Phase Change Behaviors of Binary Mixtures of D-Dulcitol and Pentaerythritol As Novel Heat Storage Materials

2018 ◽  
Author(s):  
Xue-Feng Shao ◽  
Jun Wang ◽  
Li-Wu Fan
Keyword(s):  
Melting Point ◽  
Phase Change ◽  
Binary Mixtures ◽  
Latent Heat ◽  
Mass Fraction ◽  
Heat Storage ◽  
Solid Phase ◽  
Sugar Alcohols ◽  
Nucleation Agent ◽  
Latent Heat Storage

As a promising Phase Change Material (PCM) candidate for low-to-medium temperature (100–250 °C) latent heat storage, sugar alcohols undergo serious supercooling during cool-down for crystallization. Technical efforts need to be dedicated to suppression or control of the supercooling of sugar alcohols. In this work, the supercooling of D-dulcitol, with a melting point of around 186 °C, was attempted to be reduced by mixing with a solid-solid PCM Pentaerythritol (PE) as the nucleation agent, which has a solid-solid phase transition temperature (∼186 °C) similar to the melting point of d-dulcitol. Such novel binary mixtures were prepared by dispersing PE powders at various mass fractions into d-dulcitol melt. The non-isothermal phase-change-related properties, with emphasis on the crystallization properties, were tested on a heat-flux differential scanning calorimeter at a constant heating/cooling rate of 5 °C/min. The preliminary results showed that both the crystallization point and latent heat of crystallization strongly depend on the mass fraction of PE, and both decrease in magnitude with the increasing in mass fraction of PE. The degree of supercooling of the binary mixtures also depend on the mass fraction of PE, and a reduction of up to 10 °C was obtained at 50 wt.% PE, as a result of the decrease in the melting points of the binary mixtures.

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