Geothermal energy (pdf, 495KB)
Geothermal energy is a result from the extraction of the heat in the molten core of the Earth with the radioactive processes in progress there, as well as with the potential and kinetic energy accompanying tectonic processes. It can be extracted to the surface of the Earth by thermal springs, by volcanoes or by artificial pumping and heating of water or other energy carriers in heated rock masses or in the earth space.
Wind energy (pdf, 269KB)
Wind and the energy generated from it have proven to be attractive for several reasons - wind is plentifully available, it is a cheap and virtually inexhaustible source of energy, and does not cause environmental damage or climatic anomalies. Briefly, it possesses properties, which none of the traditional energy sources used for generation of electricity can boast of. Operational costs for generation of energy, or rather the absence of fuel supply costs does make wind an especially attractive energy source in the eyes of investors.
However, is this technology viable and reasonably usable for production of energy in the actual climatic and market environment of Bulgaria?
Solar energy (pdf, 109KB)
An alternative energy sources is solar energy which is practically inexhaustible.The solar radiation potential on Bulgaria’s territory is considerable but there is considerable difference in sunlight intensity in the different regions. Data analysis shows that Bulgaria’s territory can be divided into three solar zones; the average annual sunshine duration is roughly 2150 h which is about 49% of the maximum.
Biofuels (pdf, 149KB)
Biofuels are still regarded as an alternative to conventional fuels, but in the context of rising prices of fuels, their practical exhaustibility and the global objectives for reducing greenhouse gas emissions and protection of the environment they are placed in a new position - fuel of the future. Biofuels are extracted as a result of processing biomass, which in turn is a renewable source, biofuels are a direct substitute of fossil fuels in the transport sector and can easily be integrated in the system of fuel supply.
Cogenerator (pdf, 206KB)
The co-generator is a highly efficient unit for combined generation of heat, electricity and cooling power. Cogeneration is a process for simultaneous production of two or more types of power from a single source of primary energy (fuel).
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