Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8072660 | Energy | 2017 | 45 Pages |
Abstract
In this research article a new modified adsorbent has been presented to be used in thermally driven adsorption systems for renewable energy applications. Bentonite is introduced as a cheap adsorbent with high potential for use in heat pumps or chillers driven by renewable energy. A simple acid activation procedure increases the inner surface of the material and also enhances the water adsorption capacity markedly. The raw bentonite is activated with different concentrations (0.2, 0.4, 0.6 mol Lâ1) of HCl. FT-IR, XRD, N2 adsorption, water adsorption and heat capacity measurements have been carried out for the raw and HCl activated bentonite. The acid activation process increased the surface area of the bentonite from 64 m2 gâ1 to a level of 500 m2 gâ1. In that respect the maximum adsorption capacity has markedly increased by the acid activation. Experimental and theoretical studies for the adsorption isotherms and kinetics at different adsorption temperatures of water vapor onto 0.6 HCl treated bentonite have been conducted. A simulation for an adsorption cooling system employing treated bentonite has been presented. The performance of the modeled system has been also studied to be driven by low grade heat source temperatures at different operating conditions.
Related Topics
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Energy (General)
Authors
Ahmed A. Askalany, Sebastian-Johannes Ernst, Philipp P.C. Hügenell, Hans-Jörg Bart, Stefan K. Henninger, Ahmed S. Alsaman,