Spacer Bars play a crucial role in double-glazed units (also known as insulated glass units or IGUs). These units consist of two or more glass panes separated by a spacer bar, creating an insulating air or gas-filled space between the panes. The spacer bar's primary function is to maintain a uniform distance between the glass panes and provide structural integrity to the overall double-glazed unit.
Here are some key aspects of spacer bars used in double glazed units:
1. Material: Spacer bars are typically made from various materials, such as aluminum, stainless steel, thermally improved aluminum, or a combination of materials. Aluminum is a common choice due to its lightweight, durability, and thermal conductivity properties.
2. Insulating Properties: To enhance the insulating properties of the double-glazed unit, the spacer bar may have a "thermal break" or "warm edge" technology. This technology uses materials with low thermal conductivity to reduce heat transfer between the inside and outside of the unit, thereby improving energy efficiency and reducing condensation.
3. Shape and Design: Spacer bars are available in different shapes and designs. Traditional spacer bars are often rectangular or U-shaped, while more modern designs might be thinner and have curved or profiled edges. The choice of spacer bar design can impact the overall aesthetics and thermal performance of the double-glazed unit.
4. Desiccant: Inside the spacer bar, a desiccant material is placed. The desiccant's purpose is to absorb any moisture or humidity trapped within the unit during the manufacturing process, ensuring the air or gas-filled space remains dry and condensation-free.
5. Gas Filling: In some high-performance double-glazed units, the space between the glass panes is filled with an inert gas, such as argon or krypton. These gases have lower thermal conductivity than air, further improving the unit's insulation properties.
6. Warm Edge Technology: As mentioned earlier, some spacer bars incorporate warm edge technology, which is essential for reducing heat loss at the perimeter of the IGU. This can contribute to overall energy efficiency and prevent the formation of condensation around the edges.
7. Structural Integrity: In addition to insulating properties, the spacer bar also provides structural support to the double-glazed unit, keeping the glass panes at a consistent distance and preventing them from bowing or bending under external pressure.
8. Color Options: Spacer bars are available in various colors to match the appearance of the frame and complement the overall design of the window or door.
Double-glazed units with spacer bars offer improved thermal insulation, reduced condensation, and enhanced energy efficiency, making them a popular choice for modern windows and doors in both residential and commercial buildings. When selecting double-glazed windows or doors, it's essential to consider the type and design of the spacer bar used, as it can significantly impact the unit's performance and longevity.
