U-values - European versus Australian

U-values - European versus Australian from Paarhammer Pty Ltd

By: Paarhammer Pty Ltd  12-Sep-2016
Keywords: Doors, Windows, Sliding Doors

U-value calculations are not the same the world over. Australia has decided to follow the American NFRC (National Fenestration Rating Council) system when making calculations for the Window Energy Rating System – WERS.

U-value measures how well a product allows heat to pass through. It is a measure of the rate of non-solar heat loss or gain through a material or assembly. The lower the U-value, the greater a window's resistance to heat flow and the better its insulating value. The whole window assembly is tested which includes the effect of the frame, glass, seals and any spacers.

What does it mean that U-values differ from continent to continent? If you import windows and doors from Europe they will have a very low U-value number, lower than any U-value for windows made here in Australia. Do you get a better product? No, not necessarily. You might get the exact same product, with the U-values just calculated differently. Or you may get a better product in Australia, just with a higher number.

The AWA Australian Windows Association writes: ‘Performance calculations utilise different protocols to create their window performance data. In Europe windows are calculated to CEN protocols which utilise different temperature conditions to find the performance data of their windows. The windows will have different results to the performance data conducted in Australia.’

In Australia window sizes for U-value testing are 600mm wide x 1500mm high = 0.9m2, in Europe the size tested is up to 2.3m2 (1.23x1.48m). This means that in Europe the frame itself is a much smaller percentage in comparison to the glass than in Australia, hence another reason why U-values vary.

‘In the United States of America - while the results are calculated with the same protocols - the final data is published in Imperial units of measurement {Btu/(Hrft ²-°F)}.’ writes the AWA. ‘This differs to Australian published data that employs metric units of measurement {W/m².K}. In this case the results will differ significantly just as an inch differs from a centimetre.’ An easy way to convert inch-pound Imperial U-Values to metric U-Values, is to multiply them by 5.678.

WERS in Australia has just celebrated its 20th anniversary and now encompasses 350,000 rated products. It is not yet compulsory in Australia to have windows rated but this is envisioned for the near future.

http://www.paarhammer.com.au/

http://www.wers.net/

https://www.awa.org.au/

Keywords: Bay Windows, Bi-Fold Doors, Doors, Double Glazed Windows, Energy Efficient, Glazing - Architectural, Sliding Doors, Special Windows, Windows, Windows - Double Glazed, Windows - Special, Windows & Glazing

Other news and updates from Paarhammer Pty Ltd

Paarhammer joins the Australian Passive House Association from Paarhammer Pty Ltd thumbnail
22-Sep-2016

Paarhammer joins the Australian Passive House Association

With excellent energy efficiency ratings, Paarhammer products are a perfect fit for passive houses. Now we have joined the Australian Passive House Association.


Sliding Doors - what makes lift-slide work from Paarhammer Pty Ltd thumbnail
08-Aug-2016

Sliding Doors - what makes lift-slide work

For making an architectural statement, or for opening the home to entertaining areas, nothing beats the versatility and style of Paarhammer Sliding Doors.


Draft proof your home for savings & comfort from Paarhammer Pty Ltd thumbnail
04-Aug-2016

Draft proof your home for savings & comfort

Draft is the enemy of energy efficiency. Drafts or air leakages are year-round issues: in winter, they allow valuable warm air to escape and unwanted external cold air to enter; in summer, the reverse occurs.


Paarhammer Wood-Alu - the best of both worlds from Paarhammer Pty Ltd thumbnail
04-Aug-2016

Paarhammer Wood-Alu - the best of both worlds

The energy efficient Wood-Alu range of windows and doors feature the warmth of timber on the inside, and low maintenance aluminium on the outside. Get the best of both worlds with the natural beauty and energy efficiency of timber, with no exterior painting.


Paarhammer Builders Range from Paarhammer Pty Ltd thumbnail
04-Aug-2016

Paarhammer Builders Range

A new tooling acquisition allows Paarhammer to manufacture our Builders Range of domestic sized windows and doors at a reduced cost. This is a great way for builders to add value and achieve superior energy savings for home buyers.


MBA & HIA Award House from Paarhammer Pty Ltd thumbnail
01-Aug-2016

MBA & HIA Award House

A home incorporating the bonds of two families became the brief for this award winning home set overlooking the Werribee River in country Victoria. Two sisters and their husbands blended ideas and resources to design and build what looks like a large home, but is actually two units that allow for independence and privacy. The main criteria was high energy efficiency, home offices with separate entrances, and designing the home for retirement.


Paarhammer featured on Grand Designs Australia - 5x4 Hayes Lane from Paarhammer Pty Ltd thumbnail
01-Aug-2016

Paarhammer featured on Grand Designs Australia - 5x4 Hayes Lane

The motivation for the owner of the 5x4 Hayes Lane Project was to utilise a small, urban footprint of land to construct a liveable dwelling. Whilst maximising the use of the limited space, the building does not sacrifice functionality and an aesthetically grounded contemporary design


Blower Test for Airtightness from Paarhammer Pty Ltd thumbnail
01-Aug-2016

Blower Test for Airtightness

A blower door is a machine used to measure the airtightness of buildings. Some reasons for establishing airtightness are: reducing energy consumption due to air leakage, avoiding moisture condensation problems, and avoiding uncomfortable drafts caused by cold or hot air leaking in from the outdoors.


Top 5 renovation regrets from Paarhammer Pty Ltd thumbnail
26-Jul-2016

Top 5 renovation regrets

Insufficient insulation, air leakage, poor lighting, not selecting double glazing, and poor design are the Top 5 renovation regrets, according to the research of the Victorian Government and as stated on their website www.sustainability.vic.gov.au


Liveability - add value to your home from Paarhammer Pty Ltd thumbnail
26-Jul-2016

Liveability - add value to your home

Australia’s real estate agents are embracing the trend of comfort, energy efficiency, and healthy lifestyles when considering the appeal and marketability of a property. The use of the ‘Liveability Property Features™’ icon when advertising a property indicates that the property includes a minimum of six recognised liveability features.


Sustainable Production from Paarhammer Pty Ltd thumbnail
26-Jul-2016

Sustainable Production

It is not enough to produce sustainable products from sustainable materials, the manufacturing process and facility have to fit in with the overall ideology at Paarhammer. When building the new factory 5 years ago several sustainable features were included.


Australian Made Versus Imported Products from Paarhammer Pty Ltd thumbnail
22-Jul-2016

Australian Made Versus Imported Products

Paarhammer is proud to manufacture Australian Made windows and doors. Our philosophy is about sustainability and local jobs, therefore we use local materials where possible - including Australian glass - in our products.


Sustainability for end users from Paarhammer Pty Ltd thumbnail
22-Jul-2016

Sustainability for end users

Careful window selection and placement is rightly viewed as a means of reducing demand for artificial light and climate control.


Do your windows comply? from Paarhammer Pty Ltd thumbnail
22-Jul-2016

Do your windows comply?

Recently some high profile projects were in the media for all the wrong reasons: their windows did not comply to the Australian Standard.