[China Glass Network] There are three ways of heat transfer: convection heat transfer, heat transfer and radiation heat transfer. Convective heat transfer is due to the temperature difference in the gas, which causes the gas to convect and drive the energy to transfer; the heat conduction is the energy transfer due to the molecular motion; the radiation heat transfer is the direct transfer of energy by the ray or infrared ray. As the insulating glass, its thermal insulation performance is mainly due to the fact that the internal gas is in a closed space, the gas does not convect, and the thermal conductivity of the air is 0.028 W/mK, which is 1/27 of the thermal conductivity of the glass is 0.77 W/mK. Convective heat transfer and conduction heat transfer account for a small proportion of the energy transfer of the insulating glass. In order to improve the thermal insulation performance of the insulating glass, it is generally to increase the thickness of the space layer, and to replace the air inside the hollow glass with a gas having a low thermal conductivity, thereby reducing conduction heat transfer, but the space layer is too large and will be generated. Convection of gas, increase convective heat transfer, reasonable space layer gap should be about 12mm; to reduce radiation heat transfer, generally by using sunlight control, especially low-emissivity glass, to control the transmission of various rays, to reduce radiation heat transfer the goal of. A. Insulation and sound insulation principle of insulating glass As we all know, there are three ways to transfer energy: radiation transmission, convection transmission and conduction transmission. Radiation transfer is the transfer of energy through radiation in the form of radiation, including radiation from visible light, infrared light, and ultraviolet light, just like the transmission of sunlight. A properly configured insulating glass and a reasonable thickness of the insulating glass spacer layer can reduce the transmission of energy through the radiation form to a large extent, thereby reducing the energy loss. 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, resulting in convection of the air, resulting in the loss of energy. There are several reasons for this phenomenon: First, the sealing of the glass and the surrounding frame system is poor, and the gas inside and outside the window frame can be directly exchanged to generate convection, resulting in loss of energy; second, the internal space structure design of the insulating glass Unreasonable, the gas inside the insulating glass is convected due to the temperature difference, and the energy is exchanged to generate energy loss. Third, the temperature difference between the inside and the outside of the window constituting the whole system is large, so that the temperature difference between the inside and outside of the insulating glass is also Larger, by the action of cold radiation and heat conduction, the air firstly produces convection on both sides of the insulating glass, and then passes through the hollow glass as a whole to form a loss of energy. A reasonable hollow glass design can reduce the convection of the gas, thereby reducing the convection loss of energy. Conduction transfer is the movement of the molecules of the object, which drives the energy to move, and achieves the purpose of transmission, just like cooking with iron pots and soldering things with electric iron. The conduction of energy through the insulating glass is through the glass and its interior. The air is done. We know that the thermal conductivity of glass is 0.77W/m2k. The thermal conductivity of air is 0.028 W / m2k, 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 is the conduction and convection transfer properties that affect the energy of the insulating glass. The main factor, thus improving the sealing performance of the insulating glass, is an important factor to improve the thermal insulation performance of the insulating glass. B. Anti-condensation of insulating glass, reducing cold radiation and safety performance Since there is a desiccant inside the hollow glass that can adsorb water molecules, the gas is dry, and when the temperature is lowered, the inside of the insulating glass does not cause condensation, and at the same time, the dew point on the outer surface of the insulating glass rises. high. For example, when the outdoor wind speed is 5m/s, the indoor temperature is 20°C, and the relative humidity is 60%, the 5mm glass starts to dew at the outdoor temperature of 8°C, while the 16mm (5+6+5) insulating glass is under the same conditions. Condensation occurs only when the outdoor temperature is -2 °C, and 27 mm (5+6+5+6+5) three-layer insulating glass begins to dew at an outdoor temperature of -11 °C. Because the insulating performance of the insulating glass is better, the temperature difference between the two sides of the glass is larger, and the effect of cold radiation can also be reduced; when the outdoor temperature is -10 ° C, the temperature in front of the indoor single-layer glass window is -2 ° C and hollow. The temperature in front of the glass window is 13 ° C; in the same building structure, when the outdoor temperature is -8 ° C and the indoor temperature is 20 ° C, the 3 mm ordinary single-layer glass cold radiation area accounts for 67.4% of the indoor space, while the double layer is used. The insulating glass (3+6+3) was 13.4%. The use of insulating glass can improve the safety performance of the glass. In the case of using the original sheet glass of the same thickness, the wind-resistant strength of the insulating glass is 1.5 times that of the ordinary single-piece glass. 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