Journal of Sustainable Energy

4

Authors: LINGVAY I. , RADU E., UDREA O.

The widespread use of insulating oils (transformer oils) having mineral origin, because of their toxic organic substances and xenobiotic, poses a serious risk to the environment. Synthetic ester oils, although limited risk to the environment, its use is limited due to their relatively high price. This paper presents the preliminary results of the studies of the possible use of the natural ester oils of vegetable origin in the electrical equipment.

5

Authors: FIRINCĂ S.D., MIRCEA I., HIYASAT A., MIRCEA P.M

This paper simulates by using the Homer software, a distributed energy system with capacity below 1 MW. Among the renewable energy sources are used wind and solar energy. For photovoltaic panels, we are considering two situations: fixed panels, oriented at 45° and panels with tracking system with two axis. Simulation results contain information regarding operation hours of the system throughout the year, energy produced from the renewable energy sources, energy consumption for the load, and excess of electrical energy. The Homer software also allows an economic analysis of these systems.

6

Authors: RADU E., UDREA O., LINGVAY M., SZATMÁRI I., LINGVAY I.

Mineral insulating oils used in electrical equipment because of their toxic organic substances and xenobiotic, represents a major risk to the environment - to accidental spills pollute soil, groundwater and surface water. By microbiological tests were evaluated the biodegradability of some insulating oils used in electrical equipment. The assays were performed in comparison with edible sunflower oil and with a control sample (culture medium - without oil). The experimental results indicate that the mineral oils are more readily biodegradable than synthetic ester oil and vegetable oils. It was also found that oils with high sulfur content are more readily biodegradable.

7

Authors: BUZATU G.C., MIRCEA P.M., MIRCEA I., STAN IVAN F.E.

The energy performance of compressed air consumers aims to identify points in the process, on the basis of actual consumption of compressed air or electricity for its production, operation of the plant allows to obtain good results, as close to the nominal values for which it was designed. Establishing energy performance is achieved after performing (development) of real energy balance, based on measurements of specific energy consumption of energy facilities In this paper, the authors present the results of an energy analysis for an industrial transmission and distribution network of compressed air.