It is the use of tides or wind to deliver our daily energy needs that form ‘Green Energy’. ‘Green’ basically means that all the energy is renewable. 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.) Overall, this is the method of using modern techniques to provide eco-effiency and planet friendly options.
In the home environment, one can see examples such as Solar Thermal and Solar Water Heating Collectors. For electricity created through roof-installed panels, you would need Photovoltaic Panels or PV’s. Equally important is that of Biomass Energy – which includes Stoves, Fuel, Pellets and Boilers burning Wood. Then we have the ancient energy of the Sun and the heat that comes from it – now called Ground Source Heat Pumps. Finally, we have two of the most traditional forms of energy generation that have gone through some resurgence over the last few years; these being Wind Power, Wind Turbines and Hydropower (including Water Wheels.)
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.
Biomass Energy: This is a ‘capture all’ phrase which includes all natural materials. e.g. Wood, straw and poultry litter – but nowadays also includes modern ‘Energy Crops’. It is by using these materials in new ways to create energy that makes it so exciting. Furthermore, within the European Markets, the UK is one of the central producers of Biomass fuels. One of the main factors of this style of energy is the result without the impact on C02. To that end, many wood crops come from sustainable sources (as one tree is felled, another is planted in its place; thus the new tree absorbs the CO2 produced during the heating process.)
Within this field is the need for the use of ‘Energy Crops’, such as fast growing trees, e.g. Willow and Poplar or other entities grown on a Short Rotation Coppice (SRC). Of equal importance is the ability to produce dry matter – and perennial grasses are very good for this. Of equal importance, although maybe less well known, are Municipal and Agricultural Waste. As a by-product, Agricultural Waste is simply part of the farming process. Of equal importance is Municipal Waste, which comes from recycyled wood and food.
Geo-Thermal Energy Based Systems – By naturally heating the Earth, the Sun has the potential to generate both warm water and electricity. Within the UK, the constant ground source heat temperature is around 12 degrees centigrade – and can be utilised to both heat and cool buildings. Heat pumps are recognised as a very good form of power generation, generally giving back four units of energy for every one used. By using energy from solar electrical panels or wind turbines to power them, heat source pumps can be almost 100 percent renewable in energy production.
Wind Energy – An Update On Old Technology: 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. Frankly, electricity can be realised from as little as 2p per kWh – as opposed to the current level of 2-10 p per kWh. The financial recovery process takes around 6-9 months.
Within the UK, Hydropower suits the energy generation model. Just like a thousand years ago, we are utilising the energy from water. That aside, it is fair to say that some 2 percent of the UK’s electrical load could come from this source.
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.
Written by Scott Edwards. Visit Renewable Energy Certification or www.electricianqualification.co.uk/Green-Engineer-Certification.html.