The paper presents the global situation of solar collectors, of photovoltaic & wind systems and biomass, as “clean” solutions for the world development

The paper presents the sustainable development model, the enterprises’ role, and the measures for improving the energy efficiency.

Starting with the given solar potential for the area of Brasov, Romania, the paper presents a model with 6 steps designed to be implemented within the administrative building of an industrial enterprise placed in the same area. The model is developed in order to improve the energy efficiency of the considered administrative building through the implementation of solar PV modules and also offers an economic approach regarding the recovery time of

This paper treats one of the most actual management issues: is a company better-off in terms of energy efficiency and does it obtain better economic ratios if it takes the decision of implementing solar energy conversion systems? If it is so, one could ask to which extent and under what constraints? The paper takes the case of two companies placed in the Brasov area, which act in two different industrial sectors: equipments and machines manufacturing

Biodiesel markets experienced fast growth in recent years and are forecast to expand further. In Europe, the regional and national mandates and targets inspired producers to extend their capacities, betting on a bright future for biodiesel. However, even considering consumption growth rates of 10% for this year, a considerable share of European production capacity would be idle and local demand would still be fulfilled in part by imports coming mainly

Conquering the EU bioiesel market has become a highly competitive endeavour for the Americas, but attention has now switched to building internal demand. In recent years, the two American continents have reinforced their place in the world biodiesel market, playing a very important role in supplying Europe with necessary green diesel to fulfil national targets and obligations. This year, however, the two regions have been more concerned about internal

In the last 10 years, in Europe and all over the world a great increase in solar thermal collectors was registered. The design of solar applications has to consider the local solar potential assessment. The article presents the solar potential assessment for Heraklion (Greece) and Brasov (Romania) areas. This was evaluated using Mars Global Radiation Database and compared with the available solar energy calculated for Heraklion region with the help

The present work analyze the specific sources of errors which occur when solving the optimization problems of dynamic systems. There are detailed especially the errors for obtaining the objective function by using analytical methods. It can be found there are differences between the solutions obtained in an analytical manner and the solutions obtained in a numerical manner. It is offered a method of increasing the precision of optimization. The numerical

The paper treats three important economic parameters used in the energy management of an enterprise: the acquisition cost, the payback time and the average rate of the energy expenses. Calculations are done and conclusions are taken regarding the evolution of these parameters, when implementing within the enterprise, renewable energy producing systems as sustainable development solutions.

The paper presents the place of the energy subsystem within the production system and the technical parameters used in its management, considering beside the conventional energy systems, the renewable ones which are capable to offer real solutions for a sustainable development. These solutions contribute to a preservation of the global energy reserves and to a reduction of the global pollution.