Thermo-Chemical Storage Systems Essay

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Thermochemical heat storage can be physical (sorptive) or chemical based on the material used. The storage system which does not involve the production of new compound is called sorptive storage while those which involve formation of new compound are called chemical storage. The successful thermochemical storage system is sorptive storage system that works on utilizing the heat of reaction enthalpy. Thermochemical storage has considerable benefits when compared to sensible and the latent-heat thermal energy storage systems since it is easily controllable which prevents the heat loss. The features of sorptive heat storage technology enables the implementation on a large scale.
Firstly, charging process of the thermochemical storage method
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The features like increased storage capacity, decreased heat loss to the environment and flexibility of heat storage over a wide range of temperatures makes the thermochemical storage system superior to other storage systems.
The sorptive technology involves the absorption or adsorption of molecules through a reaction thereby storing heat. This kind of sorption system results in the formation of physical bond between the reaction pair, adsorbent (A) and adsorptive (B), which has a preferably high energy turnover. The preferred reaction is mostly reversible in order to perform many charge and discharge cycles.
A + B ↔ AB + heat (see Figure 2) Figure 2: Schematic diagram of sorptive thermal energy storage technology
When charging the compound, heat is applied to substance AB which dissociate into separate A and B molecule/compound. The storage is facilitated by using certain inhibitors that control the reverse reaction. To release heat, the A and B components are reacted by removal of inhibitors, ultimately favoring the reaction, resulting in the formation of compound AB and releasing heat. During this cyclic process, when the reaction between A and B is prevented, the heat which can be stored due to chemical energy cannot be released. The adsorbent such as zeolite (see Figure 3) react with water thereby act as a sorptive storage material where adsorption of water
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