Studies on dynamics of two-stage air cooled water/silica gel adsorption system

Manila, MR and Mitra, S and Dutta, P (2020) Studies on dynamics of two-stage air cooled water/silica gel adsorption system. In: Applied Thermal Engineering, 178 .

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Abstract

The objective of this study is to develop a computational model of two-stage silica gel/water adsorption cooling system. Thermal compression is achieved by adsorption, with silica gel (RD type) as the adsorbent and water as the refrigerant. Three dimensional transient heat and mass transfer analysis of adsorption heat exchangers are carried out to derive salient design and performance features. Numerical studies are carried out to evaluate the performance of the beds with respect to key operating parameters. Two different geometric models are considered for the transient study, one having vapor flow only in axial direction through the cylinder, and the other having a thin mesh inserted between the shell and heat exchanger tubes, resulting in a much shorter vapor flow path through the packed bed. Bed temperature distribution, pressure dynamics and the effect of critical depth on uptake of the adsorber heat exchanger are studied numerically. In addition, a parametric study is carried out to determine the significance of silica gel particle diameter on the uptake of the bed. The optimum particle diameter in terms of uptake was found to be 0.8 mm. The effect of ambient temperature on the performance of single-stage and two-stage systems is also studied. © 2020 Elsevier Ltd

Item Type:	Journal Article
Publication:	Applied Thermal Engineering
Publisher:	Elsevier Ltd
Additional Information:	Copy right for this article belongs to Elsevier Ltd
Keywords:	Adsorption; Heat exchangers; Mass transfer; Packed beds; Particle size; Silica; Silica gel, Adsorption cooling; Computational model; Heat exchanger tube; Operating parameters; Particle diameters; Pressure dynamics; Silica gel particles; Thermal compressions, Heat transfer performance
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	04 Dec 2020 08:39
Last Modified:	04 Dec 2020 08:39
URI:	http://eprints.iisc.ac.in/id/eprint/65921

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