RENEWABLE ENERGY SYSTEMS
The information on these pages results from my researches into the potential for self-builders, or those aspiring to a self-sufficient lifestyle, to utilise renewable energy technologies on a domestic scale. These notes have also served as a way for me to organise my thinking about renewable energy. I don't for a moment pretend that this is a complete survey or represents fast-developing best practice. I don't have any formal scientific training and I have at times struggled to make sense of detailed technical data presented by manufacturers as a means of 'proving' that their equipment is the best. I have had to simplify some complex systems in order to describe them and don't discuss the technical aspects of their operation, even though this may be an important consideration when it comes to choosing specific equipment. I don't have a connection with any of the products or companies mentioned. I hope my comments will act as a stimulus to further enquiry and prompt questions by anyone who wishes to increase their independence from bought-in energy and fossil fuels.
The application of terminology such as 'Renewable Energy', 'Sustainable Energy', 'Zero-Carbon', 'Carbon-Neutral' and 'Carbon-Negative' is open to different interpretations and challenges. It is also necessary to differentiate between 'Embedded Energy' - the energy used in the manufacture, processing and delivery to the point of use of a piece of equipment, and the 'Operating Energy' - energy which that equipment consumes in order to function. Some equipment with low energy use in operation has very high embedded energy. Some would also argue that the source of both types of energy, and whether that is renewable, must be considered.
It is vital that renewable energy is not used as an excuse to consume energy. Super-efficient insulation, sustainable and intelligent building design, the best-rated appliances and lowest consumption lighting all come before installing renewable energy sources.
Links to pages describing specific technologies are at the foot of this page
I hope to add to the information as I install one or more of these technologies in my own house, and to report on the performance which they achieve.
Go to this page to view my Solar Thermal installation and comments on ongoing operation
Renewable Energy comes from
Sometimes the term Sustainable Energy is used: in my opinion the systems which use these five sources cannot always be described as 'sustainable' if they require inputs of electricity from the grid to make them function.
None of these sources can be used directly, with the exception of the Sun as a passive source in buildings expressly designed to capture solar energy for space heating. All other sources must be somehow converted into a form useable for energy and this includes the Sun for water heating or electricity.
The principal technologies available to use in the early 21st. century in a domestic context are
The use of Water and Earth relies on the fact that both water and earth store heat, are always at a more stable temperature than the air, and for part of the year in UK are at a higher temperature than air.
Grants from Government and Non-Governmental sources do exist, all have restrictions and limits for private domestic use. The principal sources of information are the Low Carbon Buildings Programme and Clear Skies (see Links). All insist on installations using approved equipment and approved contractors. The cynic in me suspects that a self-builder on their own will end up paying as much with a grant as they could have paid by using equipment and contractors selected with their own judgement, i.e. grants benefit contractors not householders. Don't accept the restrictions imposed by a grant without checking thoroughly that the equipment and system design is equally as good as a setup you would have selected yourself, and could have obtained for the same or less money after getting several quotations. Be wary of companies promoting too heavily the grants which their services attract.
LINKS are intentionally kept to a minimum, entering key words into search engines will bring up thousands of sites.
Detailed comments on an individual approach to Sustainability: www.earth.org.uk
Association for Environment Conscious Building: www.aecb.net
UK Building Research Establishment: www.bre.co.uk
Clear Skies: www.clear-skies.org
Energy Saving Trust: www.est.org.uk
Better Generation (lots of info. but they do sell stuff so care needed): www.bettergeneration.co.uk
Greenspec (vital source of products and materials): www.greenspec.co.uk
Low Carbon Buildings Programme: www.lowcarbonbuildings.org.uk
Green Book Live (approved products and materials): www.greenbooklive.com
Renewable Energy Association: www.r-p-a.org.uk
Not forgetting Channel4 Grand Designs: www.channel4.com/4homes
Further pages deal with each technology in turn, with discussion of the available systems and some links to futher sources of information. No single system is likely to provide a complete solution to a specific energy requirement, equally each has an important role in the right location.
Please click on a button to the left:
SOLAR THERMAL PANELS
SOLAR PHOTO-VOLTAIC PANELS
GEO-THERMAL ENERGY - Water and Earth
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