Title: Comparative energy and exergy analyses of pumice and vermiculite-based salt-in-matrix composites for low-grade thermochemical heat storage applications

Authors: Abdullah Al-Ghosini; Devrim Aydin

Addresses: Department of Mechanical Engineering, Eastern Mediterranean University, G. Magosa, TRNC Mersin 10, Turkey ' Department of Mechanical Engineering, Eastern Mediterranean University, G. Magosa, TRNC Mersin 10, Turkey

Abstract: Thermochemical heat storage (THS) is a promising technology for enhancing renewable energy utilisation, with thermochemical materials (TCMs) playing a pivotal role in THS performance. This study aims to experimentally evaluate the cyclic thermodynamic performance of nine different composite TCMs based on pumice and vermiculite. According to the results, V-LiCl achieved the highest four-cycle average energetic efficiency of 74%, followed by P-CaCl₂-LiCl with 70%. Peak exergetic efficiency was obtained with V-LiCl at 17.5% in the first cycle, which gradually dropped to 5.5% in the fourth cycle. Based on the testing results, pumice-based TCMs showed more stable hygro-cyclic and exergetic efficiency.

Keywords: thermochemical heat storage; THS; salt in matrix; pumice; vermiculite; sorption; energy and exergy; experimental analyses; energy storage density; composite sorbent.

DOI: 10.1504/IJEX.2024.137565

International Journal of Exergy, 2024 Vol.43 No.3, pp.273 - 286

Received: 28 Dec 2023
Accepted: 20 Feb 2024
Published online: 25 Mar 2024 *

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