Renewable energy

Renewable energy is energy generated from natural processes that are replenished constantly. This includes sunlight, wind, tidal, geothermal heat of the earth, water and various forms of biomass. This energy can not be exhausted, and constantly updated.

  Solar  

The sun is a major, renewable and inexhaustible source of energy. 

Every day, the sun bathes the Earth in an unimaginable amount of solar energy, most of which comes in the form - visible light. All over the planet Earth, sunlight is the most important source of energy for all living beings, without it, the Earth would be lifeless. Sunlight can be a practical power source for daily needs such as cooking, heating water, heating or home. 

To use the sun as an energy source we need to convert it to visible light to heat or electricity. 

Electricity is supplied by solar panels 

Heat is supplied by solar collectors 

Heat pumps also use the sun's energy, ie solar heat stored in the air, soil and ground water. Heat pump takes heat from the soil, for example, so that it can be used for heating of buildings and hot water. The principle on which such a pump is based, is not new, since it is the inverse principle cooler which extracts heat from the food stored inside, and releases it into the environment. 

There are heat pumps that can be used for both purposes - for heating in winter and cooling in summer. These heat pumps, which get their energy from the air, especially popular in North America, while heat pumps for space heating and domestic water dominated in Europe. Here geothermal pumps are the most common, which use ground as a heat source. Heat pumps use quite little energy. 1 kW/h of electric energy sufficient to generate up to 5 kW/h of heat energy, which means that about 80 percent of the heat energy drawn from the environment. Accordingly, the running costs of the heat pump are low, but initial investments, typically greater than the gas or oil-fired heating systems. Although heat pumps are environmentally friendly and highly efficient, they occupy only a relatively small proportion of the major European markets heating technology. 

  Wind Energy   

Wind energy is really another form of solar energy. 

Wind continents and oceans are due to the temperature difference across the globe. some places, especially near the equator receive more direct sunlight than those closer to the north or south pole. As a result, the air over these areas is warming up, and then rises. Cold air from the vicinity of bursts filling the space left by the ascending air flow, creating a wind. Humans have harnessed wind power for thousands of years, for the first ship across the ocean, and then to pump water and grind grain. The air is constantly in motion. In some places, especially along the coast and in the mountains, provides a high reliable source of mechanical energy. Today, wind is used as a clean, safe source of power throughout the world. Electricity using wind turbines.