DGU (Double Glass Unit)

Energy Conservation

The table given below shows, how insulating glass helps in conserving energy in hot climate, as compared to monolithic glass.

Monolithic Glass
Monolithic glass such as annealed glass is a single glass.It gets heated directly by sunlight. When air conditioner is used inside the building, the temperature difference between the inside and outside the building is very high. There is only a thin glass barrier to prevent the outside heat from coming in - resulting in excessive loss of energy.

Insulating Glass
Double glass such as IG, contains hermetically sealed dry air space between the sheets of glass. Double glazing prevents direct contact with sunlight. When air conditioner is used inside the building, the temperature difference between the inside and outside of the building is very less. Due to convection, air circulates inside and acts as a barrier, preventing outside heat from coming inside and the cool air inside from escaping - results in energy saving.

Perfect Transparency
Insulated glass units help in reducing the incidence of condensation on the warm air side and bring about transparency. IG can be used in larger glazed areas without increasing energy consumption and still bring about perfect transparency. For example, insulated glass is used in soft drink chillers in retail stores, airports, etc.

Sound Insulation
Monolithic glass resonates when high frequency sound comes in because it cannot withstand the high frequency. IG units are highly effective in reducing sound transmission. Air inside the IG will prevent the resonance from passing through. For example, buildings near airports, railway stations, and main roads are constructed using IG to prevent noise from entering the building.

Reduced Infiltration
In cold climates, the aim is to reduce infiltration of the cold, maintain internal heated temperature and reduce the cost of heating. Water from condensation build-up and the resultant water run-off can damage window sills and frames, and seep into walls and adjoining areas. Condensation will form when the moisture in the air condenses out on surfaces that are cooler. Window surfaces being colder than other surfaces in the building are more prone to condensation build up. An IGU reduces the likelihood of condensation forming by providing a thermal barrier between the inside and the outside.

Applications of IGU
Insulating glass (IG) units are used in a wide range of applications including.

  • Commercial/Residential Fixed and Operable windows
  • Curtain Walls
  • Storefronts
  • Sloped/Overhead Glazing
  • Non-vision (Spandrel) Locations



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