This work analyses a thermochemical energy storage process using Ca(OH)2/CaO chemical loop. A fluidized bed reactor is proposed to carry out the dehydration-hydration process (respectively charging and discharging stages) alternating reaction. The processes use superheated steam as the fluidizing agent. The model proposed is analyzed by sensitivity analysies, focused on the effects on the reactor performance when temperature and pressure of the inlet flows are changed. Also, the geometry of the reactor and the solid particle size distribution are investigated. Results obtained, in terms of solids conversion and heat duty required/provided from the reactor during the charging and discharging step respectively, leads to a possible integration whit a Rankine-Hirn cycle for electric production. The model of the study has been implemented by software Aspen Plus.