Preparation and Characterization of the Al/AlN-Al2O3 Composite Thermal Energy Storage with Phase Change Materials

2014 ◽  
Vol 536-537 ◽  
pp. 1477-1480 ◽  
Author(s):  
Dong Dong Wu ◽  
Hua Wang ◽  
Yong Gang Wei ◽  
Kong Zhai Li
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Liquid Aluminum ◽  
Scanning Calorimetry ◽  
Storage Density ◽  
Storage Performance

Aluminum is supposed to be admirable phase change materials (PCMs) for thermal energy storage due to its excellent heat storage density and thermal conductivity. However, its application is limited because of the flowability and corrosivity when it melt. The Al/AlN-Al2O3composite PCMs with stable thermal energy storage performance were prepared by direct nitridation method. The research showed that nitridation temperature and nitridation time are key parameters of heat storage performance of the composite materials. The morphology and thermal energy storage performance and components of the Al/AlN-Al2O3composite PCMs were investigated by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD). The results showed that the tiny particles of aluminum powders were closely coated by AlN-Al2O3encapsulating materials. This structure can prevent the flowability of the liquid aluminum and also can avoid environmental impact when the it melt, meanwhile , the composite PCMs have the performance such as stability, high thermal storage density.

scholarly journals Recent Investigations of Phase Change Materials Use in Solar Thermal Energy Storage System

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Qianjun Mao ◽  
Ning Liu ◽  
Li Peng
Keyword(s):  
Energy Storage ◽  
Melting Point ◽  
Phase Change ◽  
Latent Heat ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Solar Thermal Energy ◽  
Temperature Heat

Solar thermal energy storage (TES) is an efficient way to solve the conflict between unsteady input energy and steady output energy in concentrating solar power plant. The latent heat thermal energy storage (LHTES) system is a main method of storing thermal energy using phase change materials (PCMs). Thermal properties, that is, melting points and latent heat, are the key parameters of PCMs for the TES system. In this paper, the PCMs are classified into inorganic and organic by the chemical composition, and according to the melting point, the inorganic PCMs can be divided into three contributions: low-temperature heat storage (less than 120°C), medium-temperature heat storage (120–300°C), and high-temperature heat storage (more than 300°C). The present article focuses mainly on the recent investigations on the melting point and latent heat of PCMs via DSC setup in the solar TES systems. The results can provide a good reference for the selection and utilization of PCMs in the solar TES systems.

scholarly journals Cost/Performance Analysis of Commercial-Grade Organic Phase-Change Materials for Low-Temperature Heat Storage

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 5
Author(s):  
Tomáš Hásl ◽  
Ivo Jiříček ◽  
Michal Jeremiáš ◽  
Josef Farták ◽  
Michael Pohořelý
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Thermal Capacity ◽  
Scanning Calorimetry ◽  
Cost Performance ◽  
Temperature Range ◽  
The Relationship

Alkanes are widely used as phase change materials (PCMs), especially for thermal energy storage (TES), due to their high thermal capacity, stability, availability, and non-corrosiveness. However, the drawbacks of alkanes are low heat conductivity and high cost. Our aim was to explore alternative organic PCMs for TES and to compare such compounds based on the relationship between their performance and cost. For this purpose, we analysed several commercially available products, including long chain alkanes, alcohols, monocarboxylic acid, amines, ethers and esters in high purities. Differential scanning calorimetry and thermogravimetry (DSC and TGA) were used to measure the melting point, melting enthalpy and thermal stability of these compounds. The materials were classified according to their melting temperature. In order to compare the compounds, we calculated from the measured enthalpies and the price list provided by producers a coefficient that represents factors in both the performance and cost of the material. This method was used to identify the most suitable organic compound for thermal energy storage in each temperature range. As the main result of this work, it has been revealed that various organic compounds can be considered as a vital alternative to the alkanes in temperatures from −10 to 50 °C. On top of that, alcohols and carboxylic acids can cover the temperature range from 50 to 75 °C, which cannot be covered by alkanes.

scholarly journals Optically-regulated thermal energy storage in diverse organic phase-change materials

2018 ◽  
Vol 54 (76) ◽  
pp. 10722-10725 ◽  
Author(s):  
Grace G. D. Han ◽  
Joshua H. Deru ◽  
Eugene N. Cho ◽  
Jeffrey C. Grossman
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Organic Phase ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Heat Storage

Optical regulation of heat storage in diverse sets of organic phase-change materials is demonstrated and compared.

scholarly journals Docosane-Organosilica Microcapsules for Structural Composites with Thermal Energy Storage/Release Capability

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1286 ◽  
Author(s):  
Giulia Fredi ◽  
Sandra Dirè ◽  
Emanuela Callone ◽  
Riccardo Ceccato ◽  
Francesco Mondadori ◽  
...  
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Epoxy Resin ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Solar Thermal Energy ◽  
Structural Composites ◽  
Scanning Calorimetry ◽  
Water Emulsion

Organic phase change materials (PCMs) represent an effective solution to manage intermittent energy sources as the solar thermal energy. This work aims at encapsulating docosane in organosilica shells and at dispersing the produced capsules in epoxy/carbon laminates to manufacture multifunctional structural composites for thermal energy storage (TES). Microcapsules of different sizes were prepared by hydrolysis-condensation of methyltriethoxysilane (MTES) in an oil-in-water emulsion. X-ray diffraction (XRD) highlighted the difference in the crystalline structure of pristine and microencapsulated docosane, and 13C solid-state nuclear magnetic resonance (NMR) evidenced the influence of microcapsules size on the shifts of the representative docosane signals, as a consequence of confinement effects, i.e., reduced chain mobility and interaction with the inner shell walls. A phase change enthalpy up to 143 J/g was determined via differential scanning calorimetry (DSC) on microcapsules, and tests at low scanning speed emphasized the differences in the crystallization behavior and allowed the calculation of the phase change activation energy of docosane, which increased upon encapsulation. Then, the possibility of embedding the microcapsules in an epoxy resin and in an epoxy/carbon laminate to produce a structural TES composite was investigated. The presence of microcapsules agglomerates and the poor capsule-epoxy adhesion, both evidenced by scanning electron microscopy (SEM), led to a decrease in the mechanical properties, as confirmed by three-point bending tests. Dynamic mechanical analysis (DMA) highlighted that the storage modulus decreased by 15% after docosane melting and that the glass transition temperature of the epoxy resin was not influenced by the PCM. The heat storage/release properties of the obtained laminates were proved through DSC and thermal camera imaging tests.

Microstructure and thermal characteristics of Mg–Sn alloys as phase change materials for thermal energy storage

RSC Advances ◽  
2016 ◽  
Vol 6 (98) ◽  
pp. 96327-96333 ◽  
Author(s):  
Dong Fang ◽  
Xiaomin Cheng ◽  
Yuanyuan Li ◽  
Zheng Sun
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Latent Heat ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Thermal Characteristics ◽  
Latent Heat Storage

Latent heat storage proves to be one of the most efficient ways of storing thermal energy.

Thermal Characterization of High Temperature Inorganic Phase Change Materials for Thermal Energy Storage Applications

2012 ◽  
Author(s):  
Jamie Trahan ◽  
Sarada Kuravi ◽  
D. Yogi Goswami ◽  
Muhammad Rahman ◽  
Elias Stefanakos
Keyword(s):  
Thermal Properties ◽  
High Temperature ◽  
Energy Storage ◽  
Phase Change ◽  
Latent Heat ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Melting Behavior ◽  
Scanning Calorimetry

As the importance of latent heat thermal energy storage increases for utility scale concentrating solar power (CSP) plants, there lies a need to characterize the thermal properties and melting behavior of phase change materials (PCMs) that are low in cost and high in energy density. In this paper, the results of an investigation of the melting temperature and latent heat of two binary high temperature salt eutectics are presented. Melting point and latent heat are analyzed for a chloride eutectic and carbonate eutectic using simultaneous Differential Scanning Calorimetry (DSC) and Thermogravimetric Analsysis (TGA). High purity materials were used and the handling procedure was carefully controlled to accommodate the hygroscopic nature of the chloride eutectic. The DSC analysis gives the values of thermal properties of the eutectics, which are compared with the calculated (expected/published) values. The thermal stability of the eutectics is also examined by repeated thermal cycling in a DSC and is reported in the paper along with a cost analysis of the salt materials.

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