A Thermochemical Long‐Term Heat Storage System Based on a Salt/Zeolite Composite1. Issue 12 (27th September 2016)

• Record Type: Journal Article
• Authors: Nonnen, Thomas; Beckert, Steffen; Gleichmann, Kristin; Brandt, Alfons; Unger, Baldur; Kerskes, Henner; Mette, Barbara; Bonk, Sebastian; Badenhop, Thomas; Salg, Frank; Gläser, Roger
• Other Names: Segovia‐Hernandez Juan Gabriel sponsoringEditor.
• Is Part Of: Chemical engineering & technology. Volume 39:Issue 12(2016:Dec.)
• Page Start: 2427
• Page End: 2434
• Publication Date: 2016-09-27
• Subjects: Hygroscopic salts -- Open sorption system -- Thermochemical heat storage -- Zeolites; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.201600301
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: For the purpose of a long‐term heat storage system based on water sorption, a composite material consisting of CaCl2 and zeolite Ca‐X, obtained by ion exchange with Ca 2+ and subsequent impregnation with CaCl2 of a binder‐free granulated zeolite Na‐X, was prepared on a technical scale. In a lab‐scale apparatus, the heat storage density of the composite material reaches values up to 260 kWh m −3 for water vapor partial pressures up to 33 mbar. As compared to the pure zeolites Ca‐X and Na‐X, this corresponds to an increase in heat storage density of 45 % and 68 %, respectively. An engineering concept based on the mechanical transport of the composite heat storage material through a prereactor and a main reactor was demonstrated in a hardware‐in‐the‐loop test bench. Abstract : For thermochemical long‐time heat storage based on water sorption, a composite material with CaCl2 on zeolite Ca‐X was prepared on a technical scale. The heat storage density of the composite material could be significantly increased as compared to salt‐free Na‐X. An open sorption system with material transport is presented in a hardware‐in‐the‐loop test bench with the composite material.