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The purpose of the study was to present a case study on the parameters of photovoltaic systems installed on different types of roof. These research studies were conducted in the Laboratory of Renewable Energy at the University of Pite?ti.The case study analyzed the production of electricity for different photovoltaic systems, in terms of construction and placement.Mainly, the parameters of these systems were checked in the same weather conditions, such as: temperature, humidity, solar radiation and the unit of are...

Petroleum and its derivatives are the main source of energy for industry and domestic consumption. Petroleum hydrocarbons are based on multiple carbon bonds that develop intense and raised complex structures when they bound with other characteristic molecules, hence the latest hydrocarbons have variety of forms and consist of short, medium and long aliphatics, aromatics and polycyclic aromatic hydrocarbons of different proportions. The accidental release of these hydrocarbons into the environment represents a majo...