S.C. WIRA GRUP S.A. – Energy Research Departament
Our company is a unit of research and development, which includes a department of renewable energy that consists in first grade specialists. They have built the first grid connected photovoltaic plant in Romania (in function from 2006 at University “Politehnica” Bucharest, with a pick power of 30 kW, the biggest in Romania) and they have large experience in national and international projects in the renewable energies field.
Our employs are specialized in the attraction of financings from structural founds in the renewable energies domain (photovoltaic, wind turbines, bio-mass, micro-hydro). Our company can offer consultancy services in this field for both private and public investors.
Like in every investment the first step to a prosper business is a good feasibility study, made in accordance with the national and international standards, who can reveal the real situation existent and who can offer the most feasible solution for the place and the field of the investment. This can be done only with professionals. The team of WiraGrup is the team that you need! Every time experience prevails.
Solar cells convert sunlight directly into electricity. They are made of semiconducting materials similar to those used in computer chips. When sunlight is absorbed by these materials, the solar energy knocks electrons loose from their atoms, allowing the electrons to flow through the material to produce electricity. This process of converting light (photons) to electricity (voltage) is called the photovoltaic (PV) effect.
Solar cells are typically combined into modules that hold about 40 cells; a number of these modules are mounted in PV arrays that can measure up to several meters on a side. These flat-plate PV arrays can be mounted at a fixed angle facing south, or they can be mounted on a tracking device that follows the sun, allowing them to capture the most sunlight over the course of a day.
Thin film solar cells use layers of semiconductor materials only a few micrometers thick. Thin film technology has made it possible for solar cells to now double as rooftop shingles, roof tiles, building facades, or the glazing for skylights or atria. The solar cell version of items such as shingles offer the same protection and durability as ordinary asphalt shingles.
The performance of a solar cell is measured in terms of its efficiency at turning sunlight into electricity. Only sunlight of certain energies will work efficiently to create electricity, and much of it is reflected or absorbed by the material that makes up the cell. Because of this, a typical commercial solar cell has an efficiency of 15%-about one-sixth of the sunlight striking the cell generates electricity.
Electricity companies harness wind energy with wind turbines. When the wind flows past the turbine’s rotor blades, the blades turn and convert the wind energy into kinetic energy. This energy spins a rotor inside a generator where the kinetic energy is converted into electrical energy. Once the wind energy is converted into electricity, the electricity flows through cables in the turbine, down the turbine tower to connect with the output from the other wind turbines in the wind farm before entering local electricity networks. The greater the wind speed, the more electrical energy generated. You’ll usually see more than one wind turbine working to generate electricity – this is called a wind farm. All the wind turbines in a wind farm work independently. The output of each turbine is combined before it enters a local electricity network or the National Grid.
The greatest benefit of using wind energy is that it generates electricity without emitting greenhouse gases. Wind energy has little effect on the environment, this is because:
- wind energy is a renewable resource, so it can never run out;
- there are no emissions when generating electricity from wind.
Wind farms lessen the need for us to use fossil fuels to generate electricity, which helps to reduce greenhouse gas emissions.
Biomass is a renewable energy source because its supplies are not limited. We can always grow trees and crops, and waste will always exist. We use four types of biomass today – wood and agricultural products, solid waste, landfill gas and biogas, and alcohol fuels.
Wood and Agricultural Biomass
Wood-logs, chips, bark, and sawdust – accounts for about 65 percent of biomass energy. Other biomass sources include agricultural waste products like fruit pits and corncombs. Wood and wood waste, along whit agricultural waste, are used to create electricity and hot water in co-generation.
One ton of garbage contains about as much as 250 kg of coal. Power plants that burn garbage for energy are called waste to energy plants. These plants generate electricity much as coal-fires plants do, except that combustible garbage is the fuel used to fire their boilers. The main advantage of burning solid waste is that it reduces the amount of garbage dumped in landfills by 60 to 90 percent, which in turn reduces the cost of landfill disposal. It also makes use of the energy in the garbage, rather than burying it in a landfill, where it remains unused.
WIRA GRUP S.A.
Sos Mihai Bravu Nr 136
Sector 2, Bucuresti