This chapter describes nuclear-based energy sources and technologies such as thermochemical cycles for hydrogen production. The efficiency analysis reported in this chapter for a Cu-Cl thermochemical water decomposition cycle for hydrogen production has allowed several findings. For each of the steps in the cycle, the variations of reaction heat with parameters like process temperature have been quantified and characterized. Also exergetic efficiency of each step has been obtained based on a specified state for each step. In particular, a parametric study is reported of how the reaction heat in each chemical reaction, overall energy, and exergy efficiencies of the Cu-Cl cycle vary with the cycle temperature. This information should assist efforts to understand the thermodynamic losses in the cycle and to improve efficiency. It can be concluded that advanced hydrogen production processes show great potential for future applications.
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