A Comparison of Heat Storage Densities of Zeolite Granulates Predicted by the Dubinin-polanyi Theory to Experimental Measurements

Adsorption of Linear Alcohols in Amorphous Activated Carbons: Implications for Energy Storage Applications

“…The Dubinin-Polanyi theory also allows determining the adsorption enthalpy, which is defined as where Δ H vap , A , and Δ S are the enthalpy of vaporization, the adsorption potential (Gibbs free energy), and the entropy changes, respectively. The enthalpy of vaporization has been taken from literature, while the entropy term is where α Ads is the thermal expansion coefficient of the adsorbate obtained from the density model .…”

“…The enthalpy of vaporization has been taken from literature, while the entropy term is where α Ads is the thermal expansion coefficient of the adsorbate obtained from the density model . Finally, we followed the methodology reported by Lehmann et al to calculate the thermochemical storage density of each working pair by integrating the enthalpy curves: In summary, the mathematical model based on the Dubinin–Polanyi theory allows obtaining the storage densities of given adsorbent–fluid working pairs, just having an adsorption isotherm or isobar and some physicochemical properties of the fluids. Those properties are the enthalpy of vaporization, the bulk liquid density, the thermal expansion coefficient, and the saturation pressure.…”

“…1 In this context, one of the technologies that is gaining attention within the field of thermo-chemical heat storage is adsorption heat storage. 2,3 This is based on the energy released upon the interactions of working pairs composed of a porous solid adsorbent and a liquid adsorbate. Therefore, the efficiency of the heat storage process is highly dependent on the adsorbent− adsorbate interactions.…”

“…Thermal energy storage is one of the main current technologies leading the transition toward more efficient energy systems . In this context, one of the technologies that is gaining attention within the field of thermo-chemical heat storage is adsorption heat storage. , This is based on the energy released upon the interactions of working pairs composed of a porous solid adsorbent and a liquid adsorbate. Therefore, the efficiency of the heat storage process is highly dependent on the adsorbent–adsorbate interactions. − Being a promising technology, it still needs further development and research to end up on the market as a competitive alternative.…”

“…This heat exchange is the basis of thermal energy storage using porous materials. , A large number of existing porous materials, together with the wide variety of working fluids, make the search for the most appropriate adsorbate–adsorbent pair for each application challenging. Within porous materials, the most common adsorbents for adsorption energy storage are silica gels, ,− zeolites, ,,− metal–organic frameworks, ,− and activated carbons (ACs). − Many of these works have suggested porous materials as great candidates for thermal energy-related applications. However, most of the adsorbents have been studied in laboratories, and they are still not ready for large-scale development at the industrial scale.…”