scholarly journals Characterization of Fatty Acids as Biobased Organic Materials for Latent Heat Storage

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4707 ◽  
Author(s):  
Marie Duquesne ◽  
Clément Mailhé ◽  
Stefania Doppiu ◽  
Jean-Luc Dauvergne ◽  
Sergio Santos-Moreno ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Melting Temperature ◽  
Phase Change Materials ◽  
Latent Heat Storage ◽  
Specific Heats ◽  
Eutectic Mixtures ◽  
Salt Hydrates ◽  
Liquid States ◽  
Palmitic Acids

This work aims to characterize phase change materials (PCM) for thermal energy storage in buildings (thermal comfort). Fatty acids, biobased organic PCM, are attractive candidates for integration into active or passive storage systems for targeted application. Three pure fatty acids (capric, myristic and palmitic acids) and two eutectic mixtures (capric-myristic and capric-palmitic acids) are studied in this paper. Although the main storage properties of pure fatty acids have already been investigated and reported in the literature, the information available on the eutectic mixtures is very limited (only melting temperature and enthalpy). This paper presents a complete experimental characterization of these pure and mixed fatty acids, including measurements of their main thermophysical properties (melting temperature and enthalpy, specific heats and densities in solid and liquid states, thermal conductivity, thermal diffusivity as well as viscosity) and the properties of interest regarding the system integrating the PCM (energy density, volume expansion). The storage performances of the studied mixtures are also compared to those of most commonly used PCM (salt hydrates and paraffins).

scholarly journals Experimental Characterization of Phase Change Materials for Refrigeration Processes

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3033
Author(s):  
Anastasia Stamatiou ◽  
Lukas Müller ◽  
Roger Zimmermann ◽  
Jamie Hillis ◽  
David Oliver ◽  
...  
Keyword(s):  
Energy Density ◽  
Phase Change ◽  
Thermophysical Properties ◽  
Phase Change Materials ◽  
Cost Effective ◽  
Latent Heat Storage ◽  
Lower Energy Density ◽  
Change Material ◽  
Storage Units

Latent heat storage units for refrigeration processes are promising as alternatives to water/glycol-based storage due to their significantly higher energy densities, which would lead to more compact and potentially more cost-effective storages. In this study, important thermophysical properties of five phase change material (PCM) candidates are determined in the temperature range between −22 and −35 °C and their compatibility with relevant metals and polymers is investigated. The goal is to complement existing scattered information in literature and to apply a consistent testing methodology to all PCMs, to enable a more reliable comparison between them. More specifically, the enthalpy of fusion, melting point, density, compatibility with aluminum, copper, polyethylene (PE), polypropylene (PP), neoprene and butyl rubber, are experimentally determined for 1-heptanol, n-decane, propionic acid, NaCl/water mixtures, and Al(NO3)3/water mixtures. The results of the investigations reveal individual strengths and weaknesses of the five candidates. Further, 23.3 wt.% NaCl in water stands out for its very high volumetric energy density and n-decane follows with a lower energy density but better compatibility with surrounding materials and supercooling performance. The importance of using consistent methodologies to determine thermophysical properties when the goal is to compare PCM performance is highlighted.

Thermal Properties Analysis of Several N-Alkanes Eutectic Mixtures Applied in Building Envelopes

2012 ◽  
Vol 512-515 ◽  
pp. 3007-3010
Author(s):  
Jing Yu Huang ◽  
Shi Lei Lv ◽  
Chen Xi Zhang ◽  
Zhi Wei Wang
Keyword(s):  
Thermal Properties ◽  
Melting Temperature ◽  
Latent Heat ◽  
Heat Storage ◽  
Eutectic Mixture ◽  
Scanning Calorimetry ◽  
Latent Heat Storage ◽  
Building Envelopes ◽  
Eutectic Mixtures ◽  
Change Material

This study focuses on the preparation, thermal properties of alkanes eutectic mixtures (n-Octadecane/n-Eicosane, n-Octadecane/n-Docosane and n-Heptadecane /n-Eicosane) as candidate phase change material (PCM) for low temperature latent heat storage systems in building envelopes. Their melting temperature and latent heat were tested by Differential scanning calorimetry (DSC). The testing values were closed to calculation values of accepted theory that ensured the reliability of those datas. The results indicated n-Octadecane/n-Docosane eutectic mixture was more promising PCM for buildings in terms of melting temperature (25.3°C) and latent heat values of melting (158.2J/g).

Characterization of 9 Newly Bred Peanut Genotypes for Seed Fatty Acid Profiles Suitable for Biodiesel Production

2014 ◽  
Vol 1073-1076 ◽  
pp. 1134-1137
Author(s):  
Qing Yun Zhang ◽  
Xiu Zhen Wang ◽  
Yue Yi Tang ◽  
Qi Wu ◽  
Quan Xi Sun ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Biodiesel Production ◽  
Fatty Acid Profiles ◽  
High Productivity ◽  
Seed Fatty Acid ◽  
High Oleic ◽  
Total Fatty Acids ◽  
Palmitic Acids

Nine newly bred peanut genotypes from our research group were analyzed for their seed fatty acid composition. Oleic, linoleic and palmitic acids were 3 major fatty acids in peanut seed oil, together constituting 89.65%-91.83% of total fatty acids in peanut seeds. Five of the peanut lines/cultivars tested had an oleate to linoleate ratio (O/L) of 19.11-31.37, and may be classified as high-oleic, providing good sources for biodiesel production. Of them, 12L48 is most promising due to its high productivity and saline tolerance.

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 Biochemical Characterization of Coriander Cakes Obtained by Extrusion

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Jazia Sriti ◽  
Manel Neffati ◽  
Kamel Msaada ◽  
Thierry Talou ◽  
Brahim Marzouk
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Biochemical Characterization ◽  
Petroselinic Acid ◽  
Operating Conditions ◽  
Main Compound ◽  
Major Sterol ◽  
Total Fatty Acids ◽  
Palmitic Acids

This study was designed to examine the effect of operating conditions such as nozzle diameter on fatty acid, sterol, and tocol composition of coriander cakes. Eight fatty acids were identified, with petroselinic acid accounting for 75–77% of the total fatty acids, followed by linoleic, oleic, and palmitic acids, accounting for 12-13%, 5%, and 3%, respectively, of the total fatty acids.β-Sitosterol was the major sterol in all oils with 33–35% of total sterols. The next major sterols in all oils were stigmasterol (24% of total sterols) and Δ7-stigmasterol (15% of total sterols). Coriander cake contained higher amounts of total tocotrienol whereγ-tocotrienol was the main compound.

The effects of compounding conditions on the properties of fatty acids eutectic mixtures as phase change materials

2013 ◽  
Vol 69 ◽  
pp. 116-121 ◽  
Author(s):  
Hongtao He ◽  
Qinyan Yue ◽  
Baoyu Gao ◽  
Xiaowei Zhang ◽  
Qian Li ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Phase Change ◽  
Phase Change Materials ◽  
Eutectic Mixtures
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