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Urgent task of energy policy in the near term, in addition to diversification will encourage vigorous national economy, reducing dependence on natural gas and both demand-side measures (in the energy supply of buildings are mainly to improve the thermal protection) by measures on the production, transmi ssion and distribution (increasing efficiency of energy transforma tion and increasing the share of renewable energy at the expense of natural gas).Natural gas can be easily replaced in the supply heat buildings, a...

Here we try to find a compromise way of controlling a continuous variable power system by adopting a hybrid architecture in which the renewable energy sources are coupled with the classic power grid. In such an architecture, a big issue is the control algorithm for management of the energy sources, which had to be designed in such a way that the final consumer remain powered on at all times. We proposed a control algorithm which compares the input and output powers, if the input power is lower than the output, the...

Lead-free solutions for protective coatings as an alternative for ecological galvanized steel sheets obtaining were studied in this paper. The lead from zincing baths was eliminated and replaced with bismuth as non hazardous elements. Also other alloying elements (nickel, tin, and aluminium) in zinc melts were added. The making technology of these galvanizing free-lead alloys wa s established in accordance with alloying elements properties. The tec hnological conditions for obtai ning zinc-bismuth coatings with va...

Nowadays, when the amount of exhaustible energy resources in the world are reducing and their prices are increasing proportionately , mankind tries to find alternative sources of energy. Use of solar radiation has huge potential in th e future. Already today, the sunlight is transformed into heat or electric energy. For the conversion of solar energy into electricity we are using photovoltic cells. The Slovak Republic is in the use of photovoltaic systems on the tail in the Euro pean Union. Electricity produced by...

Structure of the mathematical model of underground coal gasification process in terms of material and energy (heat) balance is presented in this paper. Base inputs of gasification process are coal (coal model) and oxidant (a mixture of oxygen and air), which appropriate combination has to ensure the best possible conditions for the gasification process. The expected energy output from coal gasification process is a synthetic gas - syngas. Components such as ash, tar and unburned coal are side outputs of the proces...

The contribution deals by the suggestion of new manufacturing technology for hand- made screw blade for wind-power plant. A wind turbine is a device that converts kinetic energy from the wind into electricity for distribution. Wind turbine blades are most often fabricated by hand using multiple layers of fi breglass cloth. The traditional method is for the sheets to be cut to shap e, laid down in a mould by hand, sprayed or rolled with resins, and finally cured. The automation of the manufacturing of hand-made pro...

Iran is a country with an area of 1,648,198 Km 2 in the Middle East. When it comes to sun, there are 300 days of pure high UV sunshine in 95% of the country. There is a triangular great desert from center to the East of Iran, which due to its position receives a large amount of solar energy. Because this area is enclosed by the high ridge Alburz Mountains in the North, the Zagros Mountains in the West and the Makran Mountains in the East, there is no climate variability and also its geographi cal and environmental...