Thermochemical energy storage frameworks are still in the early stages of … Contact online >>
Thermochemical energy storage frameworks are still in the early stages of
Thermal energy storage (TES) is increasingly important due to the
The research field on thermochemical energy storage (TCS) has shown
Learn about the principles, advantages and challenges of thermochemical energy storage (TCES), a method of heat storage using reversible reactions. This chapte
Thermochemical energy storage (TCES) is considered the third fundamental method of heat storage, along with sensible and latent heat storage. TCES concepts use reversible reactions to store energy in chemical bonds. During discharge, heat is recovered through the reversal reaction. In the endothermic charging process, a material dissociates into components that can be stored at ambient temperature, which is a unique property of TCES. This chapter introduces the technical variants of TCES and presents the state of the art of this storage technology.
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Airò Farulla, G.; Cellura, M.; Guarino, F.; Ferraro, M. A Review of Thermochemical Energy Storage Systems for Power Grid Support. Appl. Sci. 2020, 10, 3142. https://doi /10.3390/app10093142
Airò Farulla G, Cellura M, Guarino F, Ferraro M. A Review of Thermochemical Energy Storage Systems for Power Grid Support. Applied Sciences. 2020; 10(9):3142. https://doi /10.3390/app10093142
Airò Farulla, Girolama, Maurizio Cellura, Francesco Guarino, and Marco Ferraro. 2020. "A Review of Thermochemical Energy Storage Systems for Power Grid Support" Applied Sciences 10, no. 9: 3142. https://doi /10.3390/app10093142
Airò Farulla, G., Cellura, M., Guarino, F., & Ferraro, M. (2020). A Review of Thermochemical Energy Storage Systems for Power Grid Support. Applied Sciences, 10(9), 3142. https://doi /10.3390/app10093142
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Here we show theoretically that the design of a thermochemical energy storage system for fast response and high thermal power can be predicted in accord with the constructal law of design. In this fundamental configuration, the walls of the elemental cylinder are impregnated with salt, while humid air is blown through the tube. Cases with constant salt volume or constant fluid volume or both are considered. It is shown that the best design in each case meets the equipartition of imperfections principle. The predictions are confirmed by full numerical experiments, allowing to consider various shape ratios and study their impact on the overall performance.
The observation of the natural evolution of flow systems towards configurations offering easier access to their currents was stated for the first time in 1996 through the constructal law17. In constructal design, the flow must be understood in its broadest assertion: a flow happens every time a potential difference is created. It may be a flow of fluid, of heat, of mass etc. The morphing of flow architectures for least overall flow resistance was then proven to be predictable. Examples are found in all the domains of science: from engineering and the tree-shaped configurations of point-to-volume flow systems18, to biology and the prediction of animal life span19,20, medicine21 and most recently the quantum footprint22.
In this paper we use the constructal law to demonstrate that the design of thermochemical energy storage for energy efficiency can be predicted. We focus on a small elemental component to shed light on the fundamental aspects of transport phenomena: a cylindrical channel which wall is impregnated with a reactive salt. This elemental system is aimed at being a component of a bigger system honeycombe shaped.
Here we consider a cylinder of radius R and length L. A volume of salt Vs is deposited uniformly along the cylinder wall. We hypothesise that one layer of salt grain covers the wall and will consider only diffusion through the grain. Assume that the salt impregnation on the internal tube wall is done at grain scale. The heat transfer fluid (humid air) licks the salt, water vapor diffuses within, allowing the chemical reaction to happen, and heat to be stored or released. The salt thickness is termed e. The volume Vf of humid air blown along the cylinder is Vf = πRi2L. We have Ri + e = R (Fig.1).
Elemental configuration: the heat transfer fluid is channeled through the tube letting water vapor diffuse radially through the salt impregnated along the tube wall.
The reaction advancement at t = t(a=0) + Δt, when (a) the fluid volume is fixed, and (b) the salt volume is fixed.
The reaction advancement as a function of the dimensionless time for 2 extreme cases when (a) the fluid volume is fixed, and (b) the salt volume is fixed.
The dimensionless thermal power as a function of the advancement (top), and the dimensionless heat released as a function of the dimensionless time (bottom) for 2 extreme cases when (a) the fluid volume is fixed, and (b) the salt volume is fixed.
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