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Simple Guide to Sustainable Windows

GUIDE IN SELECTING WINDOWS FOR YOUR CLIMATE ZONE

 

Here is a simple guide to selecting the windows for your project. Windows can have a large effect on your energy rating, so make sure you contact Sustainability WA to ensure  your windows will work for you.


 

 

Hot Climate Zones (Climate Zones 1, 2 & 3) Areas included in these climate zones are Northern Australia, Brisbane, Darwin

ConsiClimate Chartderations: Keep solar radiation out of the home;  Retain  Coolness of

air-conditioned air

Preferred U-Value: LOW

Preferred SHGCw: LOW

Other Factors: Wind with high operable areas to maximize  opportunity for air movement for natural cooling

 

 

Mixed Climate Zones (Climate Zones 4 & 5) Areas included in these climate zones are Sydney, Perth and Adelaide

Climate Chart

Considerations: Balance the benefits of solar heat gain in winter against keeping cool in summer. Use mid-range solar control.
Reduce heat flowing through windows (in & out) over course of year

Preferred U-Value: LOW

Preferred SHGCw: Mid Range (or ideally tuned by elevation)

Other Factors: “season-specific” physical shading of windows (e.g. eaves over Northern-facing windows). Windows with adequate operable area of ventilation

 

 

Cold Climate Zones (Climate Zones 6, 7 & 8 ) Areas included in these climate zones cover most of Victoria, Australian Capital Territory, Tasmania and some southern parts of New South Wales and Eastern Australia

 

Climate ChartConsiderations: Maximise opportunity to exploit desirable solar heat gain for majority of year. Reduce heat flowing through windows (in both directions) over course of year.

Preferred U-Value: LOW

Preferred SHGCw: HIGH (or ideally tuned by elevation)

Other Factors: “Season-specific” physical shading of windows (e.g. over North-facing windows)

 

 

 

 

 

*From the SWA project there have been three Simple Guides to Window Selection Developed. These guides focus on providing the information to allow you to select the best windows your climate. *Information Courtesy of Window Energy Rating Scheme (WERS)


For more information on how  SIMPLE GUIDE TO SUSTAINABLE WINDOWS will affect the energy efficiency of your house, or you would like to know more about the service Sustainability WA provide including an Energy Rating or Energy Efficiency certification for your project please contact us here or phone 08 9537 2000

Other terms sometimes used to describe an energy rating includes:  Energy Star, Energy Audit, Energy Ratings, Energy Efficiency Certificate, Energy Assessment, HERS, BER or EPC.

Sustainability WA can help you with them all!

 

 

 

 

GLAZING

When selecting windows for your home, it’s also important to consider what type of glazing or glass you should use to improve your home’s energy efficiency. Based on various window design factors—such as window orientation, your climate, your building design, etc.—you may even want different types of glazing for different windows throughout your home.

There are many types of glazing available for windows, especially since many glazing technologies can be combined. These window glazing technologies include the following:

Glass with colors

Standard Glass

It is most typically used as transparent glazing material in the building envelop e, including windows in the external walls. Glass is also used for internal partitions and as an architectural feature. When used in buildings, glass is often of a safety type, which includes reinforced, toughened and laminated glasses.

Spectrally Selective Window Glazing or Glass

A special type of low-emissivity coating is spectrally selective. Spectrally selective coatings filter out 40%–70% of the heat normally transmitted through insulated window glass or glazing, while allowing the full amount of light to be transmitted.

Glass with layers and coating

Spectrally selective coatings are optically designed to reflect particular wavelengths but remain transparent to others. Such coatings are commonly used to reflect the infrared (heat) portion of the solar spectrum while admitting a higher portion of visible light. They help create a window with a low U-factor and solar heat gain coefficient but a high visible transmittance. (See energy performance ratings for windows, doors, and skylights for more information on these terms.)

Spectrally selective coatings can be applied on various types of tinted glass to produce “customized” glazing systems capable of either increasing or decreasing solar gains according to the aesthetic and climatic effects desired.

Reflective Window Glazing or Glass

Reflective Window Glazing or Glass

Reflective coatings on window glazing or glass reduce the transmission of solar radiation, blocking more light than heat. Therefore, they greatly reduce a window’s visible transmittance (VT) and glare, but they also reduce a window’s solar heat gain coefficient (SHGC). (See energy performance ratings for windows, doors, and skylights for more information on these terms.)

Reflective coatings usually consist of thin, metallic layers. They come in a variety of metallic colors, including silver, gold, and bronze.

Reflective window glazing is commonly used in hot climates where solar heat gain control is critical. However, the reduced cooling energy demands they achieve can be offset by the resulting need for additional electrical lighting, so reflective glass is mostly used just for special applications.

Low-emissivity

Low-emissivity (Low-E) coatings on glazing or glass control heat transfer through windows with insulated glazing. Windows manufactured with Low-E coatings typically cost about 10%–15% more than regular windows, but they reduce energy loss by as much as 30%–50%.

A Low-E coating is a microscopically thin, virtually invisible, metal or metallic oxide layer deposited directly on the surface of one or more of the panes of glass. The Low-E coating reduces the infrared radiation from a warm pane of glass to a cooler pane, thereby lowering the U-factor of the window. Different types of Low-E coatings have been designed to allow for high solar gain, moderate solar gain, or low solar gain. A Low-E coating can also reduce a window’s visible transmittance unless you use one that’s spectrally selective.

To keep the sun’s heat out of the house (for hot climates, east and west-facing windows, and unshaded south-facing windows), the Low-E coating should be applied to the outside pane of glass. If the windows are designed to provide heat energy in the winter and keep heat inside the house (typical of cold climates), the Low-E coating should be applied to the inside pane of glass.

Insulated Window Glazing or Glass

Insulated window glazing refers to windows with two or more panes of glass. They are also called double-glazed and triple-glazed.

Insulated Glass

To insulate the window, the glass panes are spaced apart and hermetically sealed to form a single-glazed unit with an air space between each pane of glass. The glass layers and the air spaces resist heat flow. As a result, insulated window glazing primarily lowers the U-factor, but it also lowers the solar heat gain coefficient.

Other technologies window manufacturers use to improve the energy performance of insulated glazing include these:

* Gas fills

* Low-emissivity coatings

Heat-Absorbing, Tinted Window Glazing or Glass

Heat Absorber Glass

Heat-absorbing window glazing contains special tints that change the color of the glass. Tinted glass absorbs a large fraction of the incoming solar radiation through a window. This reduces the solar heat gain coefficient, visible transmittance, and glare.

Some heat, however, continues to pass through tinted windows by conduction and re-radiation. Therefore, the tint doesn’t lower a window’s U-factor. However, inner layers of clear glass or spectrally selective coatings can be applied on insulated glazing to help reduce these types of heat transfer.

To improve the thermal performance of windows with insulated glazing, some manufacturers fill the space between the glass panes with gas.

Gas Filled Double Glazing

Window with Gas filled

To improve the thermal performance of windows with insulated glazing, some manufacturers fill the space between the glass panes with gas.

For these gas fills, window manufacturers use inert gases—ones that do not react readily with other substances. Because these gases have a higher resistance to heat flow than air, they (rather than air) are sealed between the window panes to decrease a window’s U-factor.

For more information on how  GLAZING will affect the energy efficiency of your house, or you would like to know more about the service Sustainability WA provide including an Energy Rating or Energy Efficiency certification for your project please contact us here or phone 08 9537 2000

Other terms sometimes used to describe an energy rating includes:  Energy Star, Energy Audit, Energy Ratings, Energy Efficiency Certificate, Energy Assessment, HERS, BER or EPC.

Sustainability WA can help you with them all!


Types of Window

A smarter energy-efficient home ensures more comfort, a healthier indoor environment, lower costs to operate and reduces carbon emission. Window consideration is one among the basics. Energy efficient windows will make your home more comfortable, dramatically reduce your energy costs and help to create a brighter, cleaner, healthier environment. However, ordinary windows can also represent a major source of unwanted heat gain in summer and significant heat loss in winter. Thus, appropriate window selection is a MUST!

There are several types of window designs, with different degrees of energy efficiency, and different ventilation and lighting possibilities. They include namely – -

Fixed-pane windows

Fixed-pane windows are stationary windows. They don’t open, and can be customized and designed to match other types of windows, namely casement and double-hung windows.

Fixed-pane windows tend to be the most energy-efficient windows, but since they don’t open, they do not allow ventilation – which is a big disadvantage in many cases. They are also the most inexpensive type of windows.

Double-hung and gliding windows and sliding windows

 

Double-hung and gliding  windows and Sliding windows

Variations of the same frame design: a design that does not seal as well as other designs.

 

Casement windows, hopper windows and awning windows

 

Casement windows, hopper windows  and awning windows

(They have a crank out, and differ on where the hinges are located: at the side, at the bottom or at the top of the window).

Casement, hopper and awning windows are variations of the same frame design, based on hinges at the side, bottom or top of the window.

Casement, hopper and awning windows can be excellent windows, with a higher energy-efficiency than that of gliding and double-hung windows. Besides, they also allow good ventilation possibilities.

Bow or bay windows

Bow or bay windows are  window combinations that project outward…  They allow multiple views and are excellent for lighting and ventilation. They allow a sense of spaciousness, and they are particularly used in kitchens, though not only. Their design can reduce their structural strength.

When selecting windows for your home, it’s also important to consider what type of glazing or glass you should use to improve your home’s energy efficiency. Based on various window design factors—such as window orientation, your climate, your building design, etc.—you may even want different types of glazing for different windows throughout your home.

 

For more information on how  TYPES OF WINDOW will affect the energy efficiency of your house, or you would like to know more about the service Sustainability WA provide including an Energy Rating or Energy Efficiency certification for your project please contact us here or phone 08 9537 2000

Other terms sometimes used to describe an energy rating includes:  Energy Star, Energy Audit, Energy Ratings, Energy Efficiency Certificate, Energy Assessment, HERS, BER or EPC.

Sustainability WA can help you with them all!