An experimental device was developed to investigate the supercooling phenomenon in water inside cylindrical capsules used for cold storage process. The experimental device is formed by the test section, the cooling system, the visualization system and the data acquisition and storage system. The temperature of the transfer fluid (TF), a water-alcohol mixture (50% volume), is controlled by a constant temperature bath (CTB). The work was divided in four stages. The first is the statistical study of the supercooling and nucleation phenomena, where four capsules of 45 mm diameter made with different materials (aluminum, brass, PVC and acrylic) had been used, with different temperatures of the FT. The second stage studies the Cooling Rate, a parameter related to the supercooling and nucleation phenomena. In the third stage, the influence of the superficial roughness of the internal wall was investigated. Four aluminum capsules, with different roughness, were used. Finally, in the fourth stage, visualizations of the nucleation process had carried out, for posterior processing and analysis. The results indicate that the material of the capsule (conductivity and roughness) and the temperature of the TF have a considerable influence in the supercooling and nucleation phenomena of the water inside cylindrical capsules, strongly affecting the phase change process.