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Basically, the ‘Green Energy’ idea is how our everyday needs are supplied by natural resources such as wind, tides and even geothermal heat. They are considered ‘Green’ because they are environmentally friendly. It’s interesting to note that in some instances we’re actually travelling back in time to utilise some of the older energy skill sets e.g. Wind Power (Windmills etc.) But in the main, this is the process of utilising modern technology to provide eco-efficient and planet-friendly alternatives.

The home environment, for example, encompasses a range of energy ideas – including Solar Thermal and Solar Water Heating solutions. Equally there is electricity that is generated through roof-installed panels. Biomass Energy is the next phase, and this involves Fuel, Pellets, Stoves and Boilers burning Wood. What shouldn’t be forgotten is the heat stored in the ground from the Sun – often simply referred to as Ground Source Heat Pumps. Not all ‘Green Energy’ is new – by considering Wind Power and Hydropower we are looking at some of the oldest forms of energy production.

Thermal Energy Systems: By using different technologies, Solar Energy is effectively made up of two types of solar panels. Making hot water from solar energy is the first stage – and is known as Solar Water Heating Collection. Then we have the work of the Photovoltaic Heat Collectors, often called Solar Electrical Panels – which transform solar radiation into electricity. Across the board, Solar Panels should be mounted on a south facing roof, at an angle of 30 degrees away from horizontal – and to some extent away from blocking trees, surrounding buildings and chimneys.

In the UK, Solar Water Power is now one of the most sought after forms of Solar Energy. With the ability to provide almost half the annual need for hot water in the house, Solar Water heating systems are very important. The cost of fitting depends on whether you do it yourself (500 to 1500 pounds) or whether you get a professional fitter – in which case it will cost between 2-5k overall.

Biomass Energy Technology: This term encompasses all forms of natural products – such as plant and animal material. It is extremely useful – in that it can produce a range of power sources, including heat and electricity. It is interesting to note that the UK has some of the largest quantities of Biomass material to generate electricity within Europe. It should be borne in mind that the whole process is designed to produce energy without an impact on CO2. As each tree felled, it is replaced by another. This helps to reduce the overall effect on C02.

A process called Short Rotation Coppice (SRC), utilising trees such as Willow and Poplar, is used to meet the demands of such ‘Energy Crops’. Dry matter is also very sought after – and perennial grasses are a good source of this. Within this process also sits the lesser known Agricultural and Municipal Wastes. Agricultural Waste is commonly formed as a by-product of traditional agricultural work. Of equal importance is Municipal Waste, which comes from recycyled wood and food.

Systems Based On Geo-Thermal Energy: Used in the generation of both warm water and electricity, this energy mainly comes from the Sun and heats the Earth. Using the ground temperature of around 12 degrees in the UK – we can both heat and cool buildings. Generally, items such as Heat Pumps are thought of as very effective, as they produce four units of energy for every one that is used for generation. A greate return of energy (sometimes almost 100 percent) is produced – because heat source pumps can operate in-line with wind turbines and solar electrical panels.

Systems Based On Wind Energy: When you consider the milling of grain and pumping of water, it is easy to see how long wind energy has been with us. Whether to your home or to a local grid, when the energy has been generated it must be delivered to a point of usage – and cannot be stored. In fact, the UK has the largest wind resource within Europe. Although we only utilise 1 percent of the current electricity capability from wind – we do have the ability to create 10 percent. Overall, electricity could be generated from as low as 2p per kWh – instead of the current 2-10 p per kWh. Because of this, it is estimated that it takes between half a year to three quarters of a year to cover the installation costs.

Hydropower is a method that suits the UK energy production system. The field of using moving water to release energy is a very old technique – albeit we now do this in new ways. It is this type of energy production that could meet 2 percent of all the UK’s demand.

The Hydropower process uses a turbine that can convert the energy from one form into another. The important thing is that, without having to rely on water storage, the turbines can generate electricity. It is by using the eroded national distribution systems, that allows for outdated sluices and dams to be used by techniques known as ‘Micro-Hydro’. This smaller form of electrical output has been recently reviewed and could allocate some 200MW of capacity to the UK system. The capital cost of installing a micro-hydro system can run between 200 and 3000 pounds per kW of energy output.

‘Green Energy’ is growing – mainly due to the demands of the Western World. That said, the UK is well placed – especially in the domestic sector – to take full advantage of the items above.

With the rise in demand for domestic installations, both Electricians and Plumbers are well placed to take advantage of this technology. With ‘Green Energy’ rising up the political agenda in Europe, a range of financial aids and grants are becoming available. It is important to gain the correct qualifications to install these items. Electrical or plumbing training that incorporates green technology could be very useful for the future.

(C) Scott Edwards 2009. Check out Solar Energy Courses or CLICK HERE.

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