The reactor consists of a transparent cover, a lateral and rear insulation and a rectangular sheath in steel containing a porous medium having the ability to adsorb and desorb the refrigerant (Fig. 1(b)). In the current work, the proposed configuration is characterized by a simple design, low material cost and no harmful effect on the environment because the refrigerant is water. The refrigerator is designed to cool a small chamber for medicine or food storage in off-grid electricity regions with tropical or arid climate.