A parametric study on isobaric adsorption process in a closed adsorbent bed

Abstract

A numerical study on heat and mass transfer in an annular adsorbent bed filled with adsorbent granules for an isobaric adsorption process is performed. In order to reduce the number of independent parameters that influences heat and mass transfer in the bed, the governing equations and related initial and boundary conditions for the problem are non-dimensionalized and this yields two dimensionless parameters as G and Γ. The G dimensionless parameter is the ratio of heat of adsorption to sensible heat stored by adsorbent particle and Γ parameter compares mass diffusion within the adsorbent particle and heat diffusion in the radial direction of the adsorbent bed. The obtained results show that the total dimensionless time for an adsorption process can be reduced by increasing of Γ value. The total dimensionless time is independent from G for low values of Γ (i.e. Γ = 10 ). The present study is performed for Γ values from 10 − 5 to 1 and G value from 1 to 100.

Comparison of Uniform and Non-uniform Pressure Approaches Used to Analyze an Adsorption Process in a Closed Type Adsorbent Bed

“…The employed approach (uniform or non-uniform pressure approach), the coordinate system, bed porosity, bed thickness, and isotherm model are also presented in the table. As can be seen from Table 1, both the uniform pressure approach (Ilis et al 2010(Ilis et al , 2011Chua et al 2004;Wang and Chua 2007;Saha et al 2009;Chahbani et al 2002;Leong and Liu 2004a) and non-uniform pressure approach (Marletta et al 2002;Demir et al 2009;Leong and Liu 2004a,b, 2006Liu and Leong 2005;Sun et al 1995;Ben Amar et al 1996;Restruccia et al 2002;Maggio et al 2009;Li Yong and Sumathy 2004) were preferred by many researchers to simulate heat and mass transfer in an adsorbent bed. Radial adsorbent bed was considered in the most of the studies except the study of Sun et al (1995) in which a rectangular bed was analyzed.…”

A dimensionless analysis of heat and mass transport in an adsorber with thin fins; uniform pressure approach

“…The heat and mass transfer equations for an annular adsorbent bed were solved numerically. Ilis et al [7] performed a numerical study in an adsorbent bed during an isobaric adsorption process. They defined two dimensionless parameters which control heat and mass transfer in a granular adsorbent bed.…”

“…An equation for determination of adsorption rate in the adsorbent particle is required. In this study, the LDF method is used to determine the adsorption rate in the adsorbent particle [7].…”

Entropy generation minimization of an advanced two-bed adsorption refrigeration system

“…However, the ineffective heat and mass transfer processes in the adsorption cooling cycle result in a low coefficient of performance (COP), a bulky system, and a lack of economic viability. Researchers have attempted to address these issues through the synthesis of highly microporous [11,12] and granular adsorbent beds [13,14] and the application of micro-scaled heat exchangers [15], coated adsorbers [16], etc. such as miniaturised heat and mass transfer devices.…”