Efficiency improvement of heat storage materials for MgO/H2O/Mg(OH)2 chemical heat pumps. (15th January 2016)

• Record Type: Journal Article
• Authors: Mastronardo, E.; Bonaccorsi, L.; Kato, Y.; Piperopoulos, E.; Milone, C.
• Is Part Of: Applied energy. Volume 162(2016)
• Page Start: 31
• Page End: 39
• Publication Date: 2016-01-15
• Subjects: Chemical heat pump -- Magnesium hydroxide -- Exfoliated graphite -- Deposition–precipitation; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2015.10.066
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: A new approach was used to develop a hybrid material (DP-MG) for chemical heat pump. Mg(OH)2 was finely dispersed on exfoliated graphite by deposition–precipitation route. DP-MG sample showed enhanced stability and efficiency to chemical heat pump cycles. Abstract: MgO/H2 O/Mg(OH)2 chemical heat storage of waste energy from industrial processes is a promising technology in view of a more efficient use and saving of primary energy sources. A new approach was used to develop a hybrid heat storage material made of magnesium hydroxide (Mg(OH)2 ) and exfoliated graphite (which is used to improve the heat transfer with its high thermal conductivity). Mg(OH)2 nanoplatelets were directly grown on graphite surface via a deposition–precipitation method to increase the compatibility between the two materials. The material thus obtained, named DP-MG, was experimentally tested to determine its heat storage and output capacities. An improvement of the material efficiency was obtained with a higher storage capacity at lower reaction temperature and a higher heat output rate.