Insulated Glass Units in high-performance is produced by hermetically sealing two or more panels of glass panels together. The space between the panels of glass is created using either an aluminum or warm-edge desiccant filled spacer-bar with bent corners and keyed joints. A primary seal(gas barrier) of polyisobutylene provides an airtight seal to prevent moisture transfer into the airspace, while the secondary seal(structural)holds the unit together and provides strength.The insulating airspace is filled with air or a noble gas, such as argon or krypton inside,which provides further insulation, as these gases are denser than air and less likely to let heat conduct through the IGU. Combined with a Low-E glass coating, these gases work to improve the window’s overall U-value, which is a measure of the heating transmission through a building part(such as a wall or window). The lower the U-value, the better the insulating glass unit.

 

    The popularity of insulated glass continues to grow among r who are seeking a Insulating Glass Units become more and more popular among residential and commercial property owners in a variety of applications including windows, doors and skylights for commercial buildings and residential construction as well as in refrigeration units, transportation, marine or any other areas where energy conservation and comfort are part of the design.

 

4 Factors-determining glass energy performance

 

● Visible Light Transmittance (VLT) – Measures the amount of visible light that passes through glass.

● Solar Heat Gain Coefficient (SHGC) – The measurement of how well glass absorbs heat generated by sunlight.  Measured on a scale of 0-1, glasses with a lower SHGC value block out more heat from transmitting.

● Light to solar Gain (LSG) – A measure of how well glass allows natural light to pass through while blocking out solar heat.  It is the ratio between the Visible Light Transmittance and Solar Heat Gain Coefficient and describes the relative energy-efficiency of glasses.  While not possible, the ideal environmental performance of glass would be to transmit 100% of the sunlight while absorbing 100% of the solar heat.

● U-Value – The measurement of heat transfer through glass and other building materials.  Glasses with lower U-Values are better insulators.

● The thickness of single glass panel can be from 3mm-19mm, 

● The size of IGU can be 10*10mm to 3300*13000mm

● The glass panel can be float, reflective, tempered glass, laminated glass and Low-E glass.