The use of solar energy has long been mentioned in works scientific, historical records mention the use of solar mirrors used as weapons in war since the time of the Roman empire, that, at least two centuries before Christ. According to ABRAVA (Brazilian Association of Air Conditioning, Ventilation and Heating), since 1960 the technology of the heater Solar is already being used in our country was when the first research in Brazil and from 1973 it was used commercially.
Currently it is estimated that over 600,000 solar collectors installed in Brazil distributed in homes, hotels, motels, hospitals, restaurants, industrial, heating swimming pools and other (ABRAVA 2001).
Experiments with solar cookers second Beyer et al. (2004) date back to more than 230 years ago, when Horace de Saussure used the knowledge of physics in his time (circa 1776) for the construction of a rectangular black box with the top consists of a glass top, with three blades far apart and the other as a cover reflecting concentrator solar radiation inside this box, dubbed the "hot box". This equipment has temperatures around 118 º C. Another classic experiment that was conducted by the English astronomer John Herschel (1837) also consisted of a box blackened inside, inserted in the sand as insulation, and his head had double layer of glass. Concept common in these cases is the absorption of solar radiation into the device.
In Brazil and other countries in the Americas there is a potential enviable solar irradiance. Its use provides thermal comfort with energy savings power, decreases the removal of timber for cooking food and a source of income with the drying and marketing of food.
Mechanical Engineer of profession. Visit is site at Geradores de Energia see the Classificados de Geradores Usados and the Videos sobre Energias
