scholarly journals High-capacity high-power thermal energy storage using solid-solid martensitic transformations

2021 ◽  
Vol 187 ◽  
pp. 116490
Author(s):  
Darin J. Sharar ◽  
Asher C. Leff ◽  
Adam A. Wilson ◽  
Andrew Smith
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
High Power ◽  
Thermal Energy Storage ◽  
High Capacity ◽  
Martensitic Transformations

Thermal Energy Storage Thermal Response Model With Application to Thermal Management of High Power-Density Hand-Held Electronics

2012 ◽  
Vol 134 (1) ◽  
Author(s):  
R. A. Wirtz ◽  
K. Swanson ◽  
M. Yaquinto
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
High Power ◽  
Thermal Energy Storage ◽  
Heat Storage ◽  
Thermal Response ◽  
High Power Density ◽  
Storage Volume ◽  
Change Material

An important design objective that is unique to hand-held units is the need to constrain two temperatures: the maximum temperature of the electronic components and the maximum skin temperature of the hand-held unit. The present work identifies and evaluates, through parametric modeling and experiments, the passive thermal energy storage volume characteristics and phase change material composite properties that are most suitable for thermal control of small form-factor, high power-density, hand-held electronics. A one-dimensional transient analytical model, based on an integral heat balance, is formulated and benchmarked. The model accurately simulates the heat storage/recovery process in a semi-infinite, “dry” phase change material slab. Dimensional analysis identifies the time and temperature metrics and nondimensional parameters that describe the heat storage/release process. Parametric analysis illustrates how changes in these nondimensional parameters affect thermal energy storage volume thermal response.

scholarly journals Design and Integration of High Temperature Latent Heat Thermal Energy Storage for High Power Levels

2018 ◽  
Author(s):  
Maike Johnson ◽  
Bernd Hachmann ◽  
Andreas J. Dengel ◽  
Michael Fiß ◽  
Matthias Hempel ◽  
...  
Keyword(s):  
Energy Storage ◽  
Latent Heat ◽  
Thermal Energy ◽  
High Power ◽  
Thermal Energy Storage ◽  
Fossil Fuel ◽  
Thermal Power ◽  
Fuel Use ◽  
Storage Unit ◽  
Detailed Design

A latent heat thermal energy storage unit is being integrated into a heat- and power cogeneration plant in Saarland, Germany. This storage unit system will act as an intermediate backup to a heat recovery steam generator and gas turbine and is therefore situated in parallel to this unit, also between the feedwater pumps and the steam main. The steam required is superheated, with a nominal thermal power of 6 MW. The storage unit needs to provide steam for at least 15 minutes, resulting in a minimum capacity of 1.5 MWh. Integration of this storage unit will increase efficiency and decrease fossil fuel use by reducing the use of a conventional backup boiler, while maintaining the steam supply to the customer. The detailed design and a partial build of the storage unit has to-date been successfully concluded, as well as system design and build. Hot and cold commissioning of the storage unit, including filling of the storage unit, will commence following the completion of the storage unit. With the integration of this storage unit, fossil fuel use will be reduced in this power plant. Additionally, the production of superheated steam at a high power level in a latent heat storage unit and a comparison with simulation tools will be possible. This project includes the design, build, commissioning and testing of the storage unit. The paper discusses the detailed design of the storage and system, including the simulations of the system integration.

scholarly journals Design of high temperature thermal energy storage for high power levels

2017 ◽  
Vol 35 ◽  
pp. 758-763 ◽  
Author(s):  
Maike Johnson ◽  
Julian Vogel ◽  
Matthias Hempel ◽  
Bernd Hachmann ◽  
Andreas Dengel
Keyword(s):  
High Temperature ◽  
Energy Storage ◽  
Thermal Energy ◽  
High Power ◽  
Thermal Energy Storage

Modified Magnesium Hydride and Calcium Borohydride for High-Capacity Thermal Energy Storage

2011 ◽  
Author(s):  
Placidus B. Amama ◽  
Jonathan E. Spowart ◽  
Andrey A. Voevodin ◽  
Timothy S. Fisher
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
High Capacity ◽  
Weight Ratio ◽  
Decomposition Reaction ◽  
High Energy ◽  
Decomposition Temperature ◽  
Slow Kinetics ◽  
Calcium Borohydride

MgH2 and Ca(BH4)2 are potential thermal energy storage (TES) materials that possess extraordinarily high inherent thermal energy densities of up to 2 MJ/kg. However, the high desorption temperatures at atmospheric pressure [>300°C for Ca(BH4)2, >400°C for MgH2] coupled with slow kinetics represent significant challenges for their use in TES. In order to address these challenges, the present work focuses on the development of new modification approaches based on nanostructuring via high-energy vibratory ball milling and catalytic enhancement using pure Ni and Ni alloys. Our work reveals that high-energy vibrating-mill technique with ball-to-powder weight ratio as low as 13:1can produce MgH2 powders with nanocrystallites after 2h of milling. MgH2 milled with Ni (5 wt%) and Ni5Zr2 (5 wt%) catalysts for 2 h showed apparent activation energies, EA of 81 and 79 kJ/mol, respectively, corresponding to ∼50% decrease in EA and ∼100°C decrease in the decomposition temperature (Tdec). On the other hand, the decomposition reaction of Ca(BH4)2 does not seem to be catalyzed by the Ni-based catalysts tested.

scholarly journals Solid-state thermal energy storage using reversible martensitic transformations

2019 ◽  
Vol 114 (14) ◽  
pp. 143902 ◽  
Author(s):  
Darin J. Sharar ◽  
Brian F. Donovan ◽  
Ronald J. Warzoha ◽  
Adam A. Wilson ◽  
Asher C. Leff ◽  
...  
Keyword(s):  
Energy Storage ◽  
Solid State ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Martensitic Transformations

A New Composite Phase Change Material for Thermal Energy Storage

2019 ◽  
Author(s):  
Che-Fu Su ◽  
Xinrui Xiang ◽  
Hamed Esmaeilzadeh ◽  
Jirui Wang ◽  
Edward Fratto ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Renewable Energy ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Stokes Equations ◽  
High Capacity

Abstract Enhancing the thermal conductivity of phase change materials (PCMs) is attracting attention for renewable energy applications such as solar, geothermal and wind energy. The use of energy storage can significantly improve the efficiency of renewable energy systems due to their intermittent nature. Latent heat thermal energy storage is a particularly attractive technique due to its high capacity can store energy at near constant temperature corresponding to the phase transition temperature of the PCMs. The present work aims to overcome this undesirable property of low thermal conductivity by manipulating metal fillers including nickel (Ni) nanoparticles/nanowires within the paraffin wax to improve its thermal property. In present work, a finite element method (FEM) was developed to obtain a fundamental understanding of the behavior of the Ni particles/wires under a uniform magnetic field by predefined magnetic pads. In the model, the Navier-Stokes equations were introduced as governing equations for the fluid field and the magnetic field was simulated by Maxwell’s equations. Then the motion of single Ni wire was modeled and the translation and rotational movements of the wire was studied in this paper.

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