Hollow glass is not only transparent and clear, but also has high strength and hardness. There are three main ways of energy transfer in insulating glass, namely radiation transfer, convection transfer and conduction transfer.

1. Radiation transfer

Radiation transfer is the transfer of energy in the form of radiation by rays, including visible, infrared, and ultraviolet rays, just like the transmission of light from the sun. Reasonable allocation of hollow glass and reasonable thickness of insulating glass interval layer can reduce energy transfer through radiation to a greater extent, thus reducing energy loss.

2. Convective transfer

Convection is caused by the temperature difference between the two sides of the glass, causing air to fall on the cold side and rise on the hot side, causing air convection and energy loss. There are several reasons for this phenomenon: first, the tightness of the glass and the surrounding frame system is not good, which leads to the interflow of gas inside and outside the window frame, resulting in the loss of energy. Secondly, the unreasonable design of the space structure inside the hollow glass leads to the convection of the gas in the insulating glass due to the temperature difference, which drives the energy exchange and thus causes the energy loss. Third, the temperature difference between inside and outside the Windows constituting the whole system is large, resulting in a large temperature difference between inside and outside the insulating glass. With the help of cold radiation and heat conduction, air first generates convection on both sides of the insulating glass, and then passes through the insulating glass as a whole, causing energy loss. The reasonable design of hollow glass can reduce the convection of gas and thus reduce the convection loss of energy.

3. Conduction and transmission
Transfer refers to the movement of the molecules of an object, which causes the energy to move, so as to achieve the purpose of transfer, just like cooking in an iron pot or welding something with an electric iron. The energy transfer of hollow glass is accomplished through the glass and the air inside the glass. The existence of active molecules such as water in the air is the main factor affecting the energy conduction and convective transfer performance of insulating glass. Therefore, improving the sealing performance of insulating glass is an important factor to improve the insulating performance of insulating glass.