Title: Investigation and performance assessment of calcium bromine cycle for hydrogen production

Authors: Fatih Yilmaz; Reşat Selbaş

Addresses: Department of Electrical and Energy, Vocational School of Technical Sciences, Aksaray University, Aksaray, 68100, Turkey ' Department of Energy System Engineering, Faculty of Technology, Applied Science University of Isparta 32100, Isparta, Turkey

Abstract: Thermochemical and hybrid cycles have become increasingly important in recent years among the hydrogen production methods. In this proposed work, a thermodynamic performance evaluation of calcium bromide (Ca-Br₂) hybrid thermochemical cycle is investigated for hydrogen generation. This cycle consists of two chemical reactions and one electrochemical reaction. Energy and exergy efficiencies of each step and overall cycle are examined according to several parameters such as reference and reaction temperatures. In addition, we have conducted pure thermodynamic analyses according to the heat demand of steps and reference temperature. Results indicate that the total heat demand and overall exergy destruction rate of Ca-Br₂ cycle computed as 409 kJ/mole H₂ and 183.55 409 kJ/mole H₂, respectively. In addition, energy and exergy efficiencies of the examined cycle are found as 46.64% and 59.04%, respectively, at 25°C reference temperature.

Keywords: energy; exergy; hydrogen; Ca-Br₂.

DOI: 10.1504/IJGW.2019.098512

International Journal of Global Warming, 2019 Vol.17 No.3, pp.279 - 296

Received: 15 Jun 2018
Accepted: 30 Oct 2018
Published online: 25 Mar 2019 *

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