scholarly journals ON THE SUITABILITY OF USING HALBACH ARRAYS AS POTENTIAL ENERGY STORAGE MEDIA

2014 ◽  
Vol 58 ◽  
pp. 151-166 ◽  
Author(s):  
Daniel Mansson
Keyword(s):  
Energy Storage ◽  
Potential Energy ◽  
Storage Media ◽  
Halbach Arrays

Effect of High Temperatures and Heating Rates on High Strength Concrete for Use as Thermal Energy Storage

2010 ◽  
Author(s):  
Emerson E. John ◽  
W. Micah Hale ◽  
R. Panneer Selvam
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Molten Salt ◽  
High Temperatures ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Heat Transfer Fluid ◽  
Heating Rates ◽  
Storage Media ◽  
Concrete Mixtures

In recent years due to rising energy costs as well as an increased interest in the reduction of greenhouse gas emissions, there is great interest in developing alternative sources of energy. One of the most viable alternative energy resources is solar energy. Concentrating solar power (CSP) technologies have been identified as an option for meeting utility needs in the U.S. Southwest. Areas where CSP technologies can be improved are improved heat transfer fluid (HTF) and improved methods of thermal energy storage (TES). One viable option for TES storage media is concrete. The material costs of concrete can be very inexpensive and the costs/ kWhthermal, which is based on the operating temperature, are reported to be approximately $1. Researchers using concrete as a TES storage media have achieved maximum operating temperatures of 400°C. However, there are concerns for using concrete as the TES medium, and these concerns center on the effects and the limitations that the high temperatures may have on the concrete. As the concrete temperature increases, decomposition of the calcium hydroxide (CH) occurs at 500°C, and there is significant strength loss due to degeneration of the calcium silicate hydrates (C-S-H). Additionally concrete exposed to high temperatures has a propensity to spall explosively. This proposed paper examines the effect of heating rates on high performance concrete mixtures. Concrete mixtures with water to cementitious material ratios (w/cm) of 0.15 to 0.30 and compressive strengths of up to 180 MPa (26 ksi) were cast and subjected to heating rates of 3, 5, 7, and 9° C/min. These concrete mixtures are to be used in tests modules where molten salt is used as the heat transfer fluid. Molten salt becomes liquid at temperatures exceeding 220°C and therefore the concrete will be exposed to high initial temperatures and subsequently at controlled heating rates up to desired operating temperatures. Preliminary results consistently show that concrete mixtures without polypropylene fibres (PP) cannot resist temperatures beyond 500° C, regardless of the heating rate employed. These mixtures spall at higher temperatures when heated at a faster rate (7° C/min). Additionally, mixtures which incorporate PP fibres can withstand temperatures up to 600° C without spalling irrespective of the heating rate.

A novel synthesis of ultra thin graphene sheets for energy storage applications using malonic acid as a reducing agent

2014 ◽  
Vol 2 (47) ◽  
pp. 20345-20357 ◽  
Author(s):  
Anil Kumar ◽  
Mahima Khandelwal
Keyword(s):  
Energy Storage ◽  
Potential Energy ◽  
Specific Capacitance ◽  
Malonic Acid ◽  
High Specific Capacitance ◽  
Reducing Agent ◽  
Graphene Sheets ◽  
Novel Synthesis ◽  
Energy Storage Applications ◽  
Charge Discharge

Novel ultrathin graphene sheets (0.41 ± 0.03 nm) with increased sp2 character, high specific capacitance and charge–discharge capability have been synthesized and demonstrated to have potential energy storage applications.

RECOVERY OF STORED HEAT FROM SALT HYDRATE ENERGY STORAGE MEDIA

1986 ◽  
pp. 796-800
Author(s):  
J.C.O'C. Young ◽  
J.A. Collicutt ◽  
R.L. Rosborough
Keyword(s):  
Energy Storage ◽  
Salt Hydrate ◽  
Storage Media

A bis(terpyridine)iron network polymer on carbon for a potential energy storage material

2013 ◽  
Vol 42 (45) ◽  
pp. 15877 ◽  
Author(s):  
Kuo-Hui Wu ◽  
Hiroaki Maeda ◽  
Tetsuya Kambe ◽  
Ken Hoshiko ◽  
Eunice Jia Han Phua ◽  
...  
Keyword(s):  
Energy Storage ◽  
Potential Energy ◽  
Network Polymer ◽  
Storage Material ◽  
Energy Storage Material

scholarly journals Considerations for the Design of a High-Temperature Particle Reoxidation Reactor for Extraction of Heat in Thermochemical Energy Storage Systems

2016 ◽  
Author(s):  
Sean M. Babiniec ◽  
James E. Miller ◽  
Andrea Ambrosini ◽  
Ellen Stechel ◽  
Eric N. Coker ◽  
...  
Keyword(s):  
High Temperature ◽  
Energy Storage ◽  
Molten Salts ◽  
Coupled System ◽  
Thermal Reduction ◽  
Solid Particles ◽  
Working Fluid ◽  
Reactor Outlet ◽  
Transfer Rates ◽  
Storage Media

In an effort to increase thermal energy storage densities and turbine inlet temperatures in concentrating solar power (CSP) systems, focus on energy storage media has shifted from molten salts to solid particles. These solid particles are stable at temperatures far greater than that of molten salts, allowing the use of efficient high-temperature turbines in the power cycle. Furthermore, many of the solid particles under development store heat via reversible chemical reactions (thermochemical energy storage, TCES) in addition to the heat they store as sensible energy. The heat-storing reaction is often the thermal reduction of a metal oxide. If coupled to an Air-Brayton system, wherein air is used as the turbine working fluid, the subsequent extraction of both reaction and sensible heat, as well as the transfer of heat to the working fluid, can be accomplished in a direct-contact, counter-flow reoxidation reactor. However, there are several design challenges unique to such a reactor, such as maintaining requisite residence times for reactions to occur, particle conveying and mitigation of entrainment, and the balance of kinetics and heat transfer rates to achieve reactor outlet temperatures in excess of 1200 °C. In this paper, insights to addressing these challenges are offered, and design and operational tradeoffs that arise in this highly-coupled system are introduced and discussed.

Fabrication of Energy Storage Media BST/PVDF-PAn

2006 ◽  
Vol 949 ◽  
Author(s):  
Dabing Luo ◽  
Yan Guo ◽  
Hua Hao ◽  
Hanxing Liu ◽  
Shixi Ouyang
Keyword(s):  
Dielectric Constant ◽  
Energy Storage ◽  
Emulsion Polymerization ◽  
Lower Energy ◽  
Continuous Media ◽  
Maximum Energy ◽  
Energy Storage Density ◽  
Storage Density ◽  
Storage Performance ◽  
Storage Media

ABSTRACTPermittivity and anti-voltage ability commonly determined the energy storage density of material. Although composite could be molded easier than ceramic, its lower energy storage density prevented the material from application since the polymer usually took on poor dielectric constant. In order to enhance the energy storage performance of composite, PAn was introduced to PVDF by emulsion polymerization. SEM of the co-polymers showed that they could construct continuous media till the concentrate of aniline reached 25% while polymerizing. The permittivity of polymer rose along with the concentrate increasing of aniline and pH falling value of retreating solution. The permittivity and anti-voltage strength of composite also charged correspondingly. As a consequence, the energy storage density innovated much higher than ever. The maximum energy storage density could approach 0.9185Johr/cc.

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