A Study on Thermal Energy Storage Using Open Adsorption System.

Document Type : Research Studies

Authors

1 Instructor at the High Institute of Engineering and technology in new Damietta, Damietta, Egypt

2 an Associate Professor at the Department of Mechanical Power Engineering, Mansoura University, Mansoura, Egypt

3 Prof. of Mechanical Power Engineering, Faculty of Engineering, Mansoura University, Egypt. Mansoura

4 Mechanical Power Engineering Department, University of Mansoura, Egypt

Abstract

Theoretical and experimental investigation on the thermal energy storage of an open adsorption system is presented. Laboratory experiments have been conducted, using silica gel as adsorbent, to study the effect of flow rate and inlet relative humidity on the amount of energy stored. The theoretical model, used to describe the mass and energy transfers in the system, was solved using COMSOLTM software. The model was validated against laboratory experiments performed at varying conditions. Temperature and energy density profiles during the adsorption process have been analyzed for various conditions. Results show that the storage density increases with the increase of the flow rate. However, at higher flow rates lower discharge temperatures are obtained. So, an optimization is recommended before choosing the operating flow rate. Furthermore, results show that the higher the air inlet relative humidity, the higher the energy density and the higher the discharge temperature. The maximum energy density obtained for a bed volume of 5.09 10-4 m3 is 325.8 MJ/m3. For the predefined working conditions and assumptions, the numerical solution shows satisfied agreement with the experimental measurements.

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MEJ- Mansoura Engineering Journal
Volume 43, Issue 3
September 2018
Pages 34-43

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