Insulating glass was invented by Americans in 1865. It is a new type of building material with good heat insulation, sound insulation, beautiful appearance, and reduced building weight.

It uses two pieces (or three pieces) of glass, uses high-strength and high-airtight composite adhesive, and bonds the glass piece with the aluminum alloy frame containing desiccant to make highly efficient sound insulation and heat insulation glass. Insulating glass is superior in performance to ordinary double-layer glass, so it has been recognized by all countries in the world. Insulating glass is two or more pieces of glass with effective support and evenly spaced and bonded and sealed at the periphery, so that dry gas is formed between the glass layers Glassware for space. The main materials are glass, warm edge spacers, angle plugs, butyl rubber, polysulfide rubber, and desiccant.

principle:

Since there is a desiccant that can adsorb water molecules inside the hollow glass, the gas is dry. When the temperature is lowered, condensation does not occur inside the hollow glass, and the dew point on the outer surface of the hollow glass will also rise. high. For example, when the outdoor wind speed is 5m/s, the indoor temperature is 20℃, and the relative humidity is 60%, 5mm glass starts to dew when the outdoor temperature is 8℃, and 16mm (5+6+5) insulating glass under the same conditions, Condensation only occurs when the outdoor temperature is -2℃, and the 27mm (5+6+5+6+5) three-layer insulating glass starts to condense when the outdoor temperature is -11℃.

There are three methods of energy transfer for insulating glass: radiation transfer, convection transfer and conduction transfer.

Radiation transfer

Radiation transfer is the transfer of energy in the form of radiation through rays. Such rays include visible, infrared, and ultraviolet radiation, just like the transmission of solar rays. Reasonable configuration of insulating glass and reasonable insulating glass spacer thickness can minimize the transmission of energy through radiation, thereby reducing energy loss.

Convection

Convective transfer is due to the temperature difference between the two sides of the glass, causing the air to fall on the cold side and rise on the hot side, generating convection of the air and causing energy loss. There are several reasons for this phenomenon: one is the poor sealing between the glass and the surrounding frame system, causing the gas inside and outside the window frame to be directly exchanged to produce convection, resulting in energy loss; second, the design of the inner space structure of the hollow glass Unreasonable, the gas inside the hollow glass generates convection due to the temperature difference, which drives the energy to exchange, resulting in the loss of energy; third, the temperature difference between the inside and outside of the window forming the entire system is large, resulting in the temperature difference between the inside and outside of the hollow glass. Larger, with the help of cold radiation and heat conduction, the air first generates convection on both sides of the hollow glass, and then passes through the hollow glass as a whole, forming a loss of energy. Reasonable design of insulating glass can reduce the convection of gas and thus the convection loss of energy.

Conduction transmission

Conduction transmission is the movement of energy through the movement of the molecules of the object, and the purpose of transmission is achieved, just like cooking with an iron pan and soldering something with an electric iron, and the conduction transmission of energy through hollow glass is through the glass and its internal Air is done. We know that the thermal conductivity of glass is 0.77W/mk. The thermal conductivity of air is 0.028 W/mk, which shows that the thermal conductivity of glass is 27 times that of air, and the presence of active molecules such as water molecules in the air affects the performance of hollow glass energy conduction and convection transmission. The main factor, thus improving the sealing performance of insulating glass, is an important factor to improve the insulating performance of insulating glass.