Conservatories / Energy Rated
“Climate
change is probably the sternest challenge facing mankind and needs prompt
action. It is local, nation and international. It will affect all of our
children”
Enviroment Sec Rt Hon David Milliband.
Parliamentary statement on new draft climate control legislation 12th Oct
2006
Window
Energy Ratings – Meeting the Requirements
The British Fenestration Rating Council (BFRC) rates windows by looking at total energy balance and not one single factor. The total energy efficiency of a window is calculated by a sum of the three main heat transfer mechanisms, as detailed below;
The U Value -
- The U value is a measure of the rate of heat flow through a window.
- A lower U value indicates less heat loss through the window.
- The U Value for a window is affected by
- Type and number of panes of glass
- Coatings used on the glass panes
- Gas used to fill the glazing cavity (if any)
- Glazing cavity size
- Frame material and design
- Spacer material and design.
Solar Heat Gain
- The G Value is a measure of the rate of solar heat gain through a window.
- A Higher G Value indicates higher heat gain through the window.
Air Infiltration
- Uncontrolled air flow through a window loses heat and creates uncomfortable draughts
- Windows should be designed and fitted to minimise uncontrolled ventilation from air leakage.
These three components are given individual values, which are scaled by two constants to reflect their importance for the UK climate and the average UK house and then are combined to give the BFRC rating.
High Performance Windows
Replacing
old windows with new double glazing will improve thermal efficiency of your
home – but not all double glazed windows are the same.
Fersina’s New High Performance windows are different. By combining advanced glass and frame technology they can cut a great deal of the heat loss from your home.
Much of your home’s heat loss is through the windows, so with high fuel costs it makes sense to fit the most energy efficient double glazing you can afford.
By choosing Fersina’s High Performance windows you can benefit from real savings on your fuel bills and reduce the impact on the world’s natural resources.
Only High Performance windows can display the Energy Efficiency logo. A new energy efficiency label, similar to that displayed on domestic appliances, makes it easy to see how ‘green’ a window is.
Why Energy Rated Windows?
Reducing our impact on the environment -
- CO2 is the main green house gas effect climate change
- Our house causes a quarter of all CO2 emissions in the UK
- Windows can account for up to 30% of the total heat lost from a house
- Energy rated Advanced Performance PVC-U windows are one of the most effective ways to save energy and reduce CO2 emissions
Save energy and reduce heating bills -
- Up to 30% reduction in heat loss from the home
- Can reduce heating bills by 10% every year. (Based on Energy Saving
- Trust estimated annual figures & endorsed by British Gas)
- Highly insulated PVCu frames provide a barrier to cut heat loss
- Heat from radiators and fires is reflected back into the room, keeping more warmth inside your home
- Even during the winter, energy from the sun passes through the specialised glazed and has a warming effect on the room.
