scholarly journals Low-Cost High Energy Density Material for Solar Thermal Heat Storage

2020 ◽  
Vol 3 (2) ◽  
pp. 46-56
Author(s):  
Rebhi Damseh
Keyword(s):  
Thermal Conductivity ◽  
Energy Storage ◽  
Energy Density ◽  
Heat Storage ◽  
Low Cost ◽  
High Energy ◽  
Solar Thermal ◽  
Energy Storage Density ◽  
Solar Thermal Energy ◽  
Storage Density

A low-cost and enhanced thermal properties composite material for sensible heat storage in solar thermal energy storage applications is introduced. The proposed material is produced primarily for small scale solar thermal applications. However, it can be utilized for large scale solar thermal plants. The material has the advantages of high thermal conductivity and large energy storage density. The introduced material is composed of a mixture of cement and cast-iron particles. To obtain an optimal mixture, different samples of the material are prepared with different ratios of the cement-iron weights. The thermal conductivity of the produced samples is measured by using the linear heat conduction method. The specific heat capacity of the produced mixtures is calculated by using the Rule of the mixture. The obtained results show that the introduced material has a significant enhancement in thermal conductivity. Where, thermal conductivity as high as ~6.0 W/m.K and energy storage density as high as ~788 Joule/cm3 are achieved. The estimated volume energy density is ~89% higher than that of water. The produced material has the advantage of high energy volume density, being unhazardous, chemically stable, eco-friendly, easy to fabricate, and integrate with solar thermal energy systems and is a low-cost material.

scholarly journals Significantly Enhanced Energy Storage Density by Modulating the Aspect Ratio of BaTiO3 Nanofibers

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Dou Zhang ◽  
Xuefan Zhou ◽  
James Roscow ◽  
Kechao Zhou ◽  
Lu Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Aspect Ratio ◽  
Volume Fraction ◽  
Breakdown Strength ◽  
Electric Displacement ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Density ◽  
Storage Density

Abstract There is a growing need for high energy density capacitors in modern electric power supplies. The creation of nanocomposite systems based on one-dimensional nanofibers has shown great potential in achieving a high energy density since they can optimize the energy density by exploiting both the high permittivity of ceramic fillers and the high breakdown strength of the polymer matrix. In this paper, BaTiO3 nanofibers (NFs) with different aspect ratio were synthesized by a two-step hydrothermal method and the permittivity and energy storage of the P(VDF-HFP) nanocomposites were investigated. It is found that as the BaTiO3 NF aspect ratio and volume fraction increased the permittivity and maximum electric displacement of the nanocomposites increased, while the breakdown strength decreased. The nanocomposites with the highest aspect ratio BaTiO3 NFs exhibited the highest energy storage density at the same electric field. However, the nanocomposites with the lowest aspect ratio BaTiO3 NFs achieved the maximal energy storage density of 15.48 J/cm3 due to its higher breakdown strength. This contribution provides a potential route to prepare and tailor the properties of high energy density capacitor nanocomposites.

Flame-retardant and form-stable phase change composites based on black phosphorus nanosheets/cellulose nanofiber aerogels with extremely high energy storage density and superior solar-thermal conversion efficiency

2020 ◽  
Vol 8 (28) ◽  
pp. 14126-14134 ◽  
Author(s):  
Xiaosheng Du ◽  
Jinghong Qiu ◽  
Sha Deng ◽  
Zongliang Du ◽  
Xu Cheng ◽  
...  
Keyword(s):  
Energy Storage ◽  
Flame Retardant ◽  
Conversion Efficiency ◽  
Thermal Conversion ◽  
High Energy ◽  
Solar Thermal ◽  
Energy Storage Density ◽  
Storage Density ◽  
High Energy Storage Density ◽  
High Energy Storage

Flame-retardant PCMs with high energy storage density and superior solar-thermal conversion efficiency were fabricated by impregnating n-octacosane into CNF/BP aerogels.

scholarly journals Enhanced energy storage density of all-organic fluoropolymer composite dielectric via introducing crosslinked structure

RSC Advances ◽  
2021 ◽  
Vol 11 (25) ◽  
pp. 15177-15183
Author(s):  
Xiongjie Li ◽  
Ying Yang ◽  
Yiping Wang ◽  
Shuting Pang ◽  
Jingjing Shi ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Density ◽  
Storage Density ◽  
Organic Composites

High energy density is achieved for all-organic composites by introducing crosslinked structure.

scholarly journals Composite of Aromatic Polythiourea/BaTiO3 Nanowires with High Energy Density and High Discharge Efficiency for Energy Storage Applications

2021 ◽  
Author(s):  
Li Xiali ◽  
Liuwei Shi ◽  
Lei Chen ◽  
Wenyao Yang ◽  
Xiaoting Zha ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Density ◽  
High Discharge ◽  
Storage Density ◽  
Discharge Efficiency ◽  
High Energy Storage Density ◽  
High Energy Storage

Abstract Ceramic/polymer nanocomposites have shown great potential in high energy storage density capacitors for pulsed power applications. However, due to the difference in surface energy between inorganic fillers and polymers, the discharge energy density and efficiency of nanocomposites are limited. In this article, the BaTiO3 (BT) nanowires (nws) modified with dopamine (Dopa) was introduced into aromatic polythiourea (ArPTU) polymer matrix as composite for high performance dielectrics. This is a new path about the introduction of a high dielectric constant ceramic into high dipole moment linear polymers (HDMLP), which produces the polymer composite with high energy storage density and high discharge efficiency. The composite ArPTU/BT nws shows an energy density of 7.5 Jžcm-3 and high efficiency more than 90 % is obtained under an electric field of 250 MVžm-1. It also has been found that the modification of BT nws with the dopamine reduces the dielectric loss of composite effectively due to the good synergistic effective between ArPTU and BT nws, and high stability of composite for energy storage is also achieved. This work provides an effective solution for achieving high energy storage density and high discharge efficiency in polymer dielectrics for practical capacitor applications.

High energy-storage density of lead-free (Sr1−1.5xBix)Ti0.99Mn0.01O3 thin films induced by Bi3+–VSr dipolar defects

2019 ◽  
Vol 21 (29) ◽  
pp. 16359-16366 ◽  
Author(s):  
Xinrui Yang ◽  
Weili Li ◽  
Yulong Qiao ◽  
Yulei Zhang ◽  
Jun He ◽  
...  
Keyword(s):  
Energy Storage ◽  
Low Cost ◽  
High Energy ◽  
Energy Storage Density ◽  
Environmental Friendliness ◽  
Storage Density ◽  
Electrical Systems ◽  
New Energy ◽  
High Energy Storage Density ◽  
High Energy Storage

Capacitors with high energy storage density, low cost, ultrafast charge–discharge capability, and environmental friendliness are in high demand for application in new energy vehicles, modern electrical systems, and high-energy laser weapons.

scholarly journals The Impact of Active and Passive Thermal Management on the Energy Storage Efficiency of Metal Hydride Pairs Based Heat Storage

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3006
Author(s):  
Serge Nyallang Nyamsi ◽  
Ivan Tolj
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Management ◽  
Metal Hydride ◽  
Heat Storage ◽  
Energy Storage Density ◽  
Storage Efficiency ◽  
Transfer Enhancement ◽  
Storage Density ◽  
Energy Storage Efficiency

Two-tank metal hydride pairs have gained tremendous interest in thermal energy storage systems for concentrating solar power plants or industrial waste heat recovery. Generally, the system’s performance depends on selecting and matching the metal hydride pairs and the thermal management adopted. In this study, the 2D mathematical modeling used to investigate the heat storage system’s performance under different thermal management techniques, including active and passive heat transfer techniques, is analyzed and discussed in detail. The change in the energy storage density, the specific power output, and the energy storage efficiency is studied under different heat transfer measures applied to the two tanks. The results showed that there is a trade-off between the energy storage density and the energy storage efficiency. The adoption of active heat transfer enhancement (convective heat transfer enhancement) leads to a high energy storage density of 670 MJ m−3 (close to the maximum theoretical value of 755.3 MJ m−3). In contrast, the energy storage efficiency decreases dramatically due to the increase in the pumping power. On the other hand, passive heat transfer techniques using the bed’s thermal conductivity enhancers provide a balance between the energy storage density (578 MJ m−3) and the energy efficiency (74%). The utilization of phase change material as an internal heat recovery medium leads to a further reduction in the heat storage performance indicators (142 MJ m−3 and 49%). Nevertheless, such a system combining thermochemical and latent heat storage, if properly optimized, can be promising for thermal energy storage applications.

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