Abstract
An open system based on physical adsorption phenomena with humid air and zeolite 13X is herein discussed for residential heat storage purposes. A model has been developed to describe the conservation of mass and heat in the system. A simplified approach of a complete model describing both mass conservation in the macroporous and microporous domains is used based on the linear driving force (LDF) model. Local mass and heat transfer properties have been used. To describe the equilibrium, the Aranovich–Donohue isotherm model is selected. As an example, the developed model is compared and fitted to experimental data from a pilot scale system. A parametric study on operating and design parameters is given to understand their effect on the amount and/or duration of heat supply, concentration, and temperature profiles. The studied parameters are the inlet adsorbate concentration, fluid temperature, and velocity, as well as particle and zeolite crystal sizes. This analysis shows that an identification of values for the set of parameters tested can possibly suit the energy needs for a case study of domestic heat supply. Future work will focus on the optimization of these parameters.
Highlights
An open system based on physical adsorption phenomena with humid air and zeolite 13X is discussed for residential heat storage purposes
Physical adsorption is a surface phenomenon that transfers molecules from a fluid bulk phase to a solid surface with Van der Waals forces, whereas during chemical adsorption, the adsorbate is subject to covalent forces and to chemical reaction
A fixed-bed sorption column is here simulated in order for it to be applied to thermal energy storage for residential applications
Summary
An open system based on physical adsorption phenomena with humid air and zeolite 13X is discussed for residential heat storage purposes. The studied parameters are the inlet adsorbate concentration, fluid temperature, and velocity, as well as particle and zeolite crystal sizes. This analysis shows that an identification of values for the set of parameters tested can possibly suit the energy needs for a case study of domestic heat supply. Physical adsorption is a surface phenomenon that transfers molecules from a fluid bulk phase to a solid surface with Van der Waals forces, whereas during chemical adsorption, the adsorbate is subject to covalent forces and to chemical reaction.
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