Basically, the ‘Green Energy’ idea is how our everyday needs are supplied by natural resources such as wind, tides and even geothermal heat. Collectively they are thought to be ‘Green’ because they are ecologically sound and easy to replace. The older energy skill sets have had value for years, especially when we think of wind power and windmills. However, it is the result of eco-efficient and planet friendly options that this process is maintained.
Solar Thermal and Solar Water Heating Collectors are examples of what can be used in your house as part of renewable energy technologies. Equally there is electricity that is generated through roof-installed panels. Following on from this is a process known as Biomass Energy – which includes Boilers burning wood and other fuels. There is also the ground heat from the Sun – now known as Ground Source Heat Pumps. Considering items such as Wind Power and Hydro Turbines, we are finally getting to very old forms of energy production.
Solar Thermal Energy – By using different technologies, Solar Energy is effectively made up of two types of solar panels. Initially, there is the process of obtaining hot water from the Sun via Solar Water Heating Collectors. Additionally, there is the method of converting solar radiation into electricity known as Photovoltaic – or simply Solar Electrical panels. To get the best results these panels need to be south facing at an angle of around 30 degrees from horizontal, and away from blockages.
With Solar Power being so common within the UK, it’s Solar Water Power that is most often used. Solar Water heating systems can meet the need for more than half of all hot water needs in the domestic market. The average cost of installing this type of equipment is expected to range from 500 to 1500 pounds for a DIY system, through to 2-5k for a professionally installed system.
Systems Utilising Biomass Energy: This term encompasses all forms of natural products – such as plant and animal material. It’s the ability of this power source to generate diverse forms of energy, such as heat and electricity, that makes this so adaptable. Indeed, within the European Markets, the UK has some of the leading levels of Biomass material at hand. Added to all this, is the lack of C02 produced as a by-product of the whole process. Because the system often involves one tree being planted as another is felled, many wood crops are deemed to be sustainable sources.
To meet the need, fast growing trees, known as Short Rotation Coppice (SRC) are utilised. Perennial grasses are also responsible for large quantities of dry matter. Within this process also sits the lesser known Agricultural and Municipal Wastes. To begin with, Agricultural Waste is often produced as part of the agricultural process overall. However, waste derived from food or wood is another biomass entity – called Municipal Waste.
Systems Based On Geo-Thermal Energy: The constant energy of the Sun heating the Earth results in both warm water and electricity being produced. Using the ground temperature of around 12 degrees in the UK – we can both heat and cool buildings. Whilst these heat pumps require energy to operate, their rate of return is excellent – being four units produced for every one unit used. 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: As an energy source, wind energy has to be one of the oldest forms of energy creation in history. However, in more recent times there’s been the option to recover the energy for its own sake – and deliver this either to a home unit or to the local power grid. To be fair, the UK has the highest level of wind generation within Europe. Although, within the UK we currently only utilise 1 percent of electricity from wind, yet the potential rests at a surprising 10 percent. Rather than electricity production running at 2-10 p per kWh, it could be run at 2p per kWh. Recovery of the cost involved is somewhere between 6-9 months.
Last of all there is Hydropower – an area of especial importance to the UK. The ability to utilise energy from moving water, much like wind power, has been going on for thousands of years. That said, this type of energy can generate around 2 percent of the total electrical demand for the UK.
A hydropower system uses a turbine to create energy from moving water. By using a dam or a natural river drop, these turbines do not require water storage. A ‘Micro-Hydro’ system creates energy through the use of dams and sluices (that are no longer a part of the national distribution system.) Although a lesser known form of electricity output, this process could supply 200mW of UK demand. When considering the installation cost of items such as this, we’re looking at somewhere between 200 pounds and 3k per kW of energy created.
The demand on ‘Green Energy’ continues to develop – in light of the energy demands worldwide. The UK remains one of the main beneficiaries of this technology.
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) 2009 S. Edwards. Look at Green Engineer Certification or Renewable Energy Certification.
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