An important fact is that double glazed windows and doors can vary widely in their thermal performance due to the components used in their construction, such as the type of frame and glass, the presence of seals, additional insulation and the type of hardware.
Thermal
Efficiency
in details
Thermal break technology
All Ramarex window and door systems have in-build polyamide breaks that enable them to achieve much better thermal performance in comparison to traditional aluminium windows and doors without thermal breaks.
While aluminium is an excellent conductor of heat and cold, its thermal performance can be drastically improved with the use of thermal breaks made from polyamide material. Polyamide is widely used in the construction industry for its low thermal conductivity and excellent mechanical resistance.
EPDM (or ethylene-propylene diene monomer) is a synthetic rubber seal specifically designed for areas that are exposed to UV and prolonged sunlight.
EPDM has become a product of choice in window and doors seals for its outstanding resistance to weathering.
As standard, EPDM gaskets are inserted along the perimeter of all Ramarex frames and sashes to create tight seals and high water resistance. EPDM gaskets creates triple seal between sash and frame (externally, centrally and internally). Additionally gaskets seal insulated glass units from inside and outside. Sliding systems use a combination of EPDM gaskets, brushes and tri-fin brushes to effectively seal around the sash. Muti level sealing across all Ramarex window and door systems ensures low air infiltration and, as a result, high thermal efficiency and effective acoustic performance.
46mm IGU, Low-E glass
An insulated glass unit (IGU) usually consists of two and three panes of glass separated by spacers in order to create a high-performance glass unit. Primary and secondary sealants are used to enhance protection from heat, cold, and noise over a single glass pane. Most common double-glazed units are 24mm in width, consisting of two panes of 4mm glass and an argon gap of 16mm.
It is important to note that the recommended air gap and argon gap in a double glazed IGU is 12-16mm. Any other gap size actually reduces thermal efficiency of a glass unit. For example, an argon gap of 8mm in comparison to 16mm decreases thermal performance of an IGU by about 10%. Thermal performance suffers even further when a gap is filled with air instead of argon (by about 20%).
warm edge spacers
Despite the ancillary components used in an IGU, by far the most important component is the glass itself. In colder climates such as Victoria, retaining heat in winter is of utmost important for any home. Low emissivity glass (low-e glass) drastically improves the u-value of window and door systems, enabling thwm, to retain more heat in winter and decrease heat transfer in summer.
Another important part of an IGU is the type of spacer. Aluminium spacers are commonly used, but they do not perform as well as warm edge spacers. An improvement of 0.1-0.2 in u-value can be achieved with the use of warm edge spacers. All Ramarex IGUs come with low-e glass, argon gas, and warm edge spacers as standard. Combined with thermally broken aluminium, EPDM gaskets and brushes, a truly modern and highly energy efficient system is created.
PE insulation foam
While all Ramarex windows and doors are manufactured to achieve a standard level of thermal efficiency,this can be further improved to an advanced or high level for those demanding jobs where the lowest u-value is of importance, e.g. passive house projects and homes aiming for 8 stars and above.
Advanced systems have an additional level of PE (closed cell) insulation on the outer part of the frame and inner part of the sash. Extra insulation creates additional barriers for heat penetration and cold transfer.
A step up from the advanced system is the high level system with even more thermal insulation added to the inside of both frame and sash. This insulation strengthens the thermal break provided by polyamide even further, creating some of the lowest u-values available on the Australian market today.
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