System Windows Design Factors
The word system itself indicates the windows are designed in a proper methodology & with a purpose to fulfil Performance in terms of function. Three important aspects the windows are designed for
- Environmental Factors
- Materials Factors ( Aluminium Extrusions, Hardware & Fitting accessories)
- Quality Workmanship Factors.
These terminologies were never discussed in India but with the current trend of high rise Structures major factors effecting like Wind, water, heat, air leaks etc became a challenge against the smooth performance of the Windows.
Indian standards wind speed codes Is 875 Part III discusses the Wind speed city to city. The formula to arrive at Wind Loads also cater to Building location, terrain factor, Height, Width & Depth of the building. Multiplication of all these factors constitutes to Wind Load in (KPa) Kilo Pascals.
Whole system calculations are evaluated using the wind load & size of sections are derived to sustain the loads.
The major challenge for any window during rains is to cater to drainage of water from the track, against the wind force blocking the drains. This is a dynamic situation any system window has to address. Conventionally drains caps are too design with flaps for high rise windows. The materials for cap is also selected considering the life of Window for minimum 10 years.
There are various sources of heat coming in a window through
- non solar conduction, convection & radiations. ( U Value of Window)
- Solar heat gain through convection.
- Air flow by means on ventilation & another by means of infiltration.
Aluminium extrusions, a technique used to transform Alloy into any shape with defined cross sectional area. Aluminium has unique physical properties its malleability allows to be easily machined & cast. The most unique property of Aluminium is it is Non corrosive & at the same time provides enough strength & stability for use in Architectural products.
Aluminium once alloyed with other metals provides strength & mechanical properties to bear the strength. It can also be coated easily with 3 different processes Anodizing, Powder coating & PVDF coating. PVDF coating is now widely used due to high resistance to UV rays and allows the gloss retention up to 70% over a period of 20 years.
Corner cleats, Locks, bearings, Anti lift, drainage cap constitutes major hardware components in any sliding window. All system windows have these components & their performance in terms of operations counts the most.
A bearing which is the most important element of window needs to be used based on evaluations of dead load of glass & cyclic testing with N number of cycles tested. These data from the vendors must be taken. Very few companies like Lavaal, Giesse have these testing facilities & provide the data. Locks the second most important component needs to be tested as well for cyclical locking so that the springs & joinery perform well.
Rest all components corner cleats, drainage cap materials always need to be examined or tested for those components to perform for 10 years.
Quality & Workmanship
With all things right Aluminium extrusions, Coating, hardware, EPDM gaskets, wool pile one has to ensure the fabrications machinery used is proper to get 45 degree & 90 degree joints precisely machined. The tolerance factor in machining must be very minimum so that the end product is right.
In the installation stage also use of sub-frame on site is preferred as this helps to standardize window sizes. The labour team has to ensure all the water levels of track shutter are thoroughly inspected on site to give a right end product.
In order to achieve a problem free Window one has to focus on System Windows as the best option. Also note system windows Aluminium consumption is marginally higher than the normal windows, but the major difference is in the hardware used.
There is a difference in terms of performance & comfort in operations.
If you are looking for any system Window design & development we @ glazingshopee.com can help you source the right window for your project.