Does the low-E glass coating surface position affect the performance of the insulating glass

Most of the hollow glass types currently used are double-glass hollow, triple-glass hollow, double-glass Low-E hollow and other products. With the improvement of energy-saving performance requirements for doors and windows, the configuration of insulating glass for doors and windows is also to double-glass Low-E hollow (offline, double silver), triple-glass Low-E hollow, triple-glass double-Low-E or warm edge. With the development of technology such as inflation, the energy-saving performance of glass will be significantly improved.

People pay more and more attention to the selection of Low-E glass. Its product series, specifications and varieties have become more and more detailed. More new products have emerged for different energy-saving performance requirements.

Low-E glass characteristics

Low-E glass (also known as low-emission coated glass) is the abbreviation of Low Emissivity Glass, which is a film-based product coated with multiple layers of metal or other compounds on the surface of the glass. The product has a high transmittance for visible light, a high reflectivity for infrared rays (especially for the far-infrared), and good thermal insulation properties. It can control sunlight, save energy, control heat regulation and improve the environment. The surface emissivity e of ordinary glass is about 0.84, and the surface emissivity of on-line Low-E glass is generally below 0.25. The low-emission film layer having a thickness of 80 nm to 90 nm has a high reflectance to far-infrared heat radiation, and can reflect far-infrared radiation of more than 80%, so Low-E glass has a good function of blocking heat-insulating radiation. .

The sun's radiant light can be transmitted through the hollow glass to the interior, bringing light and warmth to our lives. The indoor items are re-radiated (long wave) due to their warm temperature. And a certain amount of heat is transmitted to the outside through the insulating glass. Insulating glass made of low-emission coated glass transmits most of the visible light and solar energy in the sun's rays into the room which effectively prevents indoor re-radiation (long-wave) from passing through the glass to the outside, thus reducing the U value of the door and window products.

In winter, the design of low-radiation insulating glass is mainly to shield ultraviolet rays, high transmission of visible light (to improve the utilization of natural light), high transmission to near-infrared rays (to obtain solar thermal energy) and low transmission long-wave (between 2.5 μm and 50 μm) to prevent heat loss in the room.

In summer, the design of low-radiation insulating glass is mainly to shield ultraviolet rays, high transmission of visible light (enhance the use of natural light), low transmission to near-infrared rays (shield solar heat), and low transmission for the wavelength (between 2.5μm and 50μm), prevent the thermal radiation of outdoor objects (roads, buildings, etc.), but also to prevent the loss of indoor air.