This study is concerned with dynamic simulation of a CaO/Ca(OH)(2) chernical heat pump system. The system consists of a hydration/dehydration reactor connected to a condenser/evaporator with a control valve between. During the dehydration process, heat is supplied at 673 K for dehydration of Ca(OH)(2), and steam is condensed at 293 K. During the hydration process, heat is supplied at 290 K for evaporation of water, and the heat of hydration is supplied to a load at 353 K. A mathematical model has been developed using time dependent mass and energy conservation equations and kinetic equations. Thermodynamic functions are used to calculate the thermodynamic parameters, and heat transfer in both reactors is considered. Using the dynamic model, simulation of an experimental prototype system has been performed. Various time dependent parameters, such as CaO/Ca(OH)(2) temperature, dehydration energy, condensation energy, evaporation energy, hydration energy etc. have been compared with experimental data. The results showed that the model and the computer code was satisfactory and could be used for dynamic simulation of CaO/Ca(OH)(2) heat pump systems in various applications.