The thermal insulation performance of insulating glass is mainly because the internal gas is in a closed space, the gas does not generate convection, and the thermal conductivity of air is 0.028W/m.K is 1/27 of the thermal conductivity of glass is 0.77W/m.K, so the heat transfer and conduction heat transfer account for a small proportion in the energy transfer of insulating glass. In order to improve the insulation performance of insulating glass, generally speaking, it is to increase the thickness of the space layer, and use the gas with low thermal conductivity to replace the air inside the insulating glass, which can reduce the conduction and heat transfer, but the space layer is too large, and the convection of the gas will be generated, increasing the convective heat transfer, and the reasonable space layer gap should be about 12mm; To reduce radiation heat transfer, it is generally done by using sunlight control, especially low-radiation glass, to control the transmission of various rays to achieve the purpose of reducing radiation heat transfer.

Insulation and sound insulation principle of insulating glass:

As we all know, there are three ways of energy transfer: radiation transfer, convection transfer and conduction transfer.

Radiation transfer is the transfer of energy through radiation in the form of radiation, including visible light, infrared and ultraviolet radiation, just like the transmission of solar light. Reasonable configuration of insulating glass and reasonable insulating glass spacing layer thickness can minimize the transfer of energy through the form of radiation, thereby reducing energy loss.

Convection transfer is due to the temperature difference on both sides of the glass, causing the air to fall on the cold side and rise on the hot side, resulting in the convection of air, resulting in the loss of energy. There are several reasons for this phenomenon: first, the seal of the glass and the surrounding frame system is poor, resulting in the direct exchange of gas inside and outside the window frame, resulting in the loss of energy; Second, the unreasonable design of the internal space structure of the insulating glass leads to the convection of the gas inside the insulating glass due to the effect of temperature difference, driving the exchange of energy, resulting in the loss of energy; Third, the temperature difference between the inside and outside of the window of the entire system is large, resulting in the temperature difference between the inside and outside of the insulating glass is also large, and the air, with the help of cold radiation and heat conduction, first generates convection on both sides of the insulating glass, and then passes through the insulating glass as a whole, forming the loss of energy. Reasonable design of insulating glass can reduce the convection of gas, thus reducing the convection loss of energy.

Conduction transfer is through the movement of the molecules of the object, drive the energy to move, and achieve the purpose of transmission, just like making rice with an iron pot and welding things with an electric iron, and the conduction and transmission of energy of insulating glass is completed through the glass and its internal air. We know that the thermal conductivity of glass is 0.77W/ m2k. The thermal conductivity of air is 0.028W/m2k, it can be seen that the thermal conductivity of glass is 27 times that of air, and the existence of active molecules such as water molecules in the air is the main factor affecting the conduction and convective transfer performance of insulating glass energy, so improving the sealing performance of insulating glass is an important factor to improve the insulation performance of insulating glass.