It is the use of tides or wind to deliver our daily energy needs that form ‘Green Energy’. They are thought to be ‘Green’ due to the fact that they are easily restored and natural. If we think of some of the older energy skills e.g. Wind Power, then in many ways we are going back in time. But in the main, this is the process of utilising modern technology to provide eco-efficient and planet-friendly alternatives.
Solar Thermal and Solar Water Heating Collectors are examples of what can be used in your house as part of renewable energy technologies. Moving on from this there are the Photovoltaic Panels (PV’s) which can generate electricity from your roof. 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. Lastly, there are two of the more historical forms of energy production – namely Wind Turbines and Hydropower.
Thermal Energy Systems: Typically referred to as Solar Energy this is mainly made up of two types of Solar Panels – each using different methods to achieve similar results. Initially, there is the process of obtaining hot water from the Sun via Solar Water Heating Collectors. Solar Electrical panels or Photovoltaic heat collectors transfer solar radiation into electricity. Obviously situated away from blockages such as chimneys etc., these Solar Panels need to be mounted on south facing roofs at an angle of 30 degrees from the horizontal.
In the UK, Solar Water Power is now one of the most sought after forms of Solar Energy. These systems are very efficient – and can deliver 50 percent of a household’s hot water requirement annually. Getting a professional fitting will cost around 2-5k, however, doing the job yourself could make it as low as 500 to 1500 pounds in total.
Biomass Energy Systems – Including all natural energy forms derived from plant and animal products – such as wood, straw, poultry litter and ‘energy crops’. As such, this is a very versatile material and can be engineered to produce heat, electricity and a combination of heat and power in the form of electricity. Furthermore, within the European Markets, the UK is one of the central producers of Biomass fuels. It should be borne in mind that the whole process is designed to produce energy without an impact on CO2. Having a tree planted in place of another (that is felled for energy production) helps overall.
A process called Short Rotation Coppice (SRC), utilising trees such as Willow and Poplar, is used to meet the demands of such ‘Energy Crops’. Perennial grasses also produce a high yield of dry matter. Whilst Agricultural and Municipal waste may be lesser known, they are essential to the whole process. To begin with, Agricultural Waste is often produced as part of the agricultural process overall. Another biomass source is that of municipal waste – and this comes from recycled wood or food.
Geo-Thermal Energy Systems… This is primarily the heating of the Earth (mainly from the sun) and can be utilised in electricity and warm water production. Having a consistent ground temperature of around 12 degrees centigrade is fortunate for the UK – as it allows both the heating and cooling of 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 greater return of energy (sometimes almost 100 percent) is produced – because heat source pumps can operate in-line with wind turbines and solar electrical panels.
Wind Energy Based Systems – The use of wind as a source of energy has been going on for thousands of years, especially in milling grain and pumping water. More recently, there has been the desire to deliver the energy created to the home – or to a local power grid. With regard to wind generation, it is the UK that has the highest production within Europe. Although we only utilise 1 percent of the current electricity capability from wind – we do have the ability to create 10 percent. Rather than electricity production running at 2-10 p per kWh, it could be run at 2p per kWh. Therefore, recovery of cost takes approximately 6-9 months overall.
Hydropower is a method that suits the UK energy production system. The ability to utilise energy from moving water, much like wind power, has been going on for thousands of years. That aside, it is fair to say that some 2 percent of the UK’s electrical load could come from this source.
The Hydropower process uses a turbine that can convert the energy from one form into another. No water reservoirs are required – as the turbines either run through a water drop-off system or the natural power of the river. Alternatively, ‘Micro-Hydro’ systems use hitherto outdated sluices and dams to generate electricity. Having been reviewed recently, this form of electricity supply could provide 200mW of the UK capacity. The expected cost of installing a system such as this would be between 200 pounds and 3k per kW of 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. Not only in the EEC, but also in the UK, ‘Green Energy’ is rapidly gaining ground as the way forward – and a range of financial incentives are in place to support this. Getting the right qualifications can often provide job security in a new field such as this. Electrical or plumbing training that incorporates green technology could be very useful for the future.
(C) 2009 S. Edwards. Go to CLICK HERE or Green Certification.
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February 26th, 2010
Jason Kendall
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