Modelling of an Adsorption Heat Storage System and Study of Operating and Design Conditions

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.

A fast and accurate 1-dimensional model for dynamic simulation and optimization of a stratified thermal energy storage

“…The design, modeling and optimization of all types of technologies are studied actively nowadays. For example, a packed bed sensible heat storage was investigated in [5], a latent heat storage included in a solar system was optimized [6], and an adsorption heat storage was modeled in [7]. Hybrid storage solutions, such as a stratified storage tank with phase change emulsion in [8], are also explored and simulation models are developed.…”