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Solar systems Metalworking Doors Hormann

Benefits of pure energy

Pure, renewable sources of energy will help decrease the amount of pollution. Wind and small hydro plants, biomass and solar energy are also important opportunities for Czech industry and the country.

Options of renewable sources:

Czech Republic will never have as many wind plants as Denmark or as much PV plants as sunny Greece. We don’t have such natural conditions. But in spite of that pure energy can also help us a lot.

The official study of Czech ecologic institute calculated that, we can cover approx. 30% of actual energetic needs from renewable sources till 2050. New law of the promotion of renewable sources can help decreasing the emissions of carbon dioxide by about 4 million tons within five years: equivalent to half of Czech cars. A single wind turbine produces enough power for about 2,000 homes.

Economic benefits

Pure energy is one of the modern and fast growing high-tech sectors. The European Commission estimates that the market in this field will reach the size of $19 billion, till the end of the decade. Pure energy is also helping to reduce the dependence of the economy on coal, uranium and oil imports.

Opportunity for province

Pure energy is opportunity for province. Growing energetic crops represents new welcomed source of income for farmers. Some small towns are running wind turbines to improve their budgets. But direct profit is not the only benefit. Moreover, money for electricity and fuel for heating remains in family budget, they’re not leaking into the pockets of big energy companies.

Costs

Renewable sources aren’t so overly expensive. The law of the promotion of pure energy will increase the price of electricity just by 16 cents per kilowatt-hour in 2010. Moreover, the price is decreasing. The cost of producing one kilowatt-hour using the wind has reduced to less than a fifth of the original price over the last twenty years.

Promising industry

Pure energy is a promising industry of the future. Therefore, the giant corporations such as Shell and BP are strategically investing into this industry.

Solar energy is environmentally the natural way for producing energy. Thanks to your own photovoltaic power plant there will be more pure energy in the grid and also the profit from the sale of this energy will provide a stable income for you.

What actually photovoltaic is? And on what principle it works?

Photovoltaic is an advanced technology that allows conversion of sunbeams into the electric power. It uses the principle of photoelectric effect when light particles - photons - hit the photovoltaic cell. After the impact, electrons start to emit photons, which are using the semi conductive solid-state structure of the cell, converted into the direct current.

There are many devices using the advantage of photovoltaic effect, from absolutely negligible power for example as in calculators, to PV plants of power around many MW.

Photovoltaic (PV) power plant consists of interconnected solar panels, which lead to the production of the DC, and inverters, that convert direct current into alternating current.

Principles of PV

The principle of generating power in the PV cell is explained by so-called photoelectric effect. During this effect the impacted photons releases and accumulates free electrons. Connecting the electrodes creates a photovoltaic cell in which the electric current can flow.

Photovoltaic cells are grouped into solar panels of various sizes and capacities. The photovoltaic panel is able to produce electricity even without direct illumination on the base of diffuse radiation, which is in the Czech Republic prevalent. Photovoltaic panels produce direct current that is needed to be transferred into the distribution network (AC) of parameters 230V / 400V, 50Hz. The process of converting DC power to AC is finalized by solar inverters. The inverter is the central brain of the whole system which provides information about produced energy, the current operating status etc.

From the inverter the AC is distributed directly to the grid.

History of PV

The expression of „photovoltaic“means transferring the light into electric power. The meaning of expression comes from the Greek, by combining the word „photo“ (light) and „volt“ (electrical voltage unit).

Thanks to the discovery of the French physicist Alexandre Edmond Becquerel in 1839, after a long 100 years the first solar cell production succeeded at Bell Laboratories. The effectiveness of the first solar panels reached 10% efficiency of currently used technologies.

Due to the complexity of manufacturing photovoltaic cells, low efficiency and high cost, the first large PV system for electricity production was installed in the end of the eighties of the 20th century in the United States of America.

Increasing the efficiency of photovoltaic panels is the alpha and omega of the development in the field of photovoltaic. Current panels are working with about 17% efficiency.  In laboratory conditions there are obtained values ​​of up to 24% using the monocrystalline cells. The innovation comes with the new form of organic solar cells with higher efficiency of about 35% and the use of nanotechnology in the production of cells, but that is the music of a near future.

Photovoltaic power plants

Photovoltaic power plant is a device used to generate electricity with the purpose to sale the electricity to the grid or for your own consumption. The bases are the photovoltaic panels that convert sunlight into electricity, which is transformed via the inverter into 230V and supplied to the distribution network.

Polycrystalline - based on a silicon underlay; cells consists of a large number of smaller polycrystals, which with its structure and purpose shows the greatest efficiency;  works best with scattered light;  long-term efficiency of about 15%; in our terms the best solution.

The structure used for mounting photovoltaic panels plays an important role. Fixed installation on the roof of the building or outdoor area means statically mounted panels in a specific angle. Installation on positioning systems, called trackers, allows us, with using of sensors, to set the panels at the appropriate angle to the incident solar radiation, which increases the overall energy yield of solar power plant.

Photovoltaic power plant:

Photovoltaic power plant is a device used to generate electricity 230V with the purpose to sale the electricity to the grid or for your own consumption. The bases are the (photovoltaic) panels which are linked to each other appropriately. Electricity generated from these panels is led into the inverter, which transforms it into grid voltage of 230 V. The transformed voltage is connected to the grid through an electrometer, which is used to measure the energy produced.

Types of installation:

There are 4 basic types of panel installation:

  • Fixed
  • Single-axis positioning
  • Two-axis positioning
  • The so-called super traxle

Fixed installation means statically mounted panels on the structure in a fixed angle. The annual production in our country is 1000 working hours in a full performance at an angle of 35 °.

Single-axis positioning unit is a set of panels on the structure installed at the optimum 35 ° with the tracker positioning of the sun in one axis - east - west. The annual production is in our conditions approximately 1250 working hours in full power. Usually can not be installed on the roof – because of statics.

Two-axis positioning is rotating panels with construction to the sun, to achieve the orthogonal beam impact. The sun is tracked even in azimuth and elevation. The annual production is in our conditions, about 1,370 working hours in full power. Usually can not be installed on the roof - because statics.

Super traxle is a single-axis positioning unit with multiplier (mirror) of luminous flux. The manufacturer gives an estimate of the annual production in our country about 1370 working hours in full power. Usually can not be installed on the roof – because of statics.