Study of adsorption and desorption kinetics of a silica gel/air couple

Author:

Hraiech Ibtissem1,Zallema Boutheina1,Zili-Ghedira Leila1

Affiliation:

1. University of Monastir, National Engineering School of Monastir

Abstract

Abstract In the energy and environmental context and given the growing energy demand during industrial processes and thermal comfort, the interest of improving the performance of the involved systems and the optimization of their operations are essential. The present paper presents a comprehensive analysis of the adsorption and desorption isotherms of silica gels, a widely used desiccant material. Accurate characterization of adsorption and desorption behaviors is pivotal in assessing performance across various applications. In this study, we examine multiple isotherm equations pertaining to silica gel's interaction with water vapor. Our findings underscore the heightened significance of adsorption capacity, particularly at lower temperatures, as evidenced by our experimental results led with a climatic wind tunnel. Furthermore, we elucidate that adsorption and desorption isotherms follow distinct paths, emphasizing the gap with the hypothetical approaches. An empirical correlation that links water content to temperature and relative humidity is introduced and compared with different theoretical approaches. This research not only enhances our understanding of silica gel's adsorption properties but also lays the groundwork for its effective utilization in applications such as, atmospheric water generation, air conditioning systems and beyond.

Publisher

Research Square Platform LLC

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