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igu window and insulated glass door
igu window and insulated glass door
Since there is a desiccant in the insulated glass that can adsorb water molecules, when the gas dries and the temperature drops, condensation disappears inside the igu window, and at the same time the dew point on the outer surface of the igu window rises. high. For example, if the outdoor wind speed is 5 m / s, the indoor temperature is 20 ° C, and the relative humidity is 60%, then when the outdoor temperature reaches 8 ° C, 5 mm of glass will begin to condense, but under the same conditions 16 mm. There is (5 + 6 + 5) insulating glass. Condensation begins when the outside air temperature reaches -2 ° C, and 27 mm (5 + 6 + 5 + 6 + 5) three-layer insulating glass begins to condense when the outside temperature reaches -11 ° C.
There are three ways to transfer energy in insulated glass door: radiation transfer, convection transfer, and conduction transfer.
Radiation transfer is the transfer of energy in the form of radiation through light rays, including visible light, infrared light, and ultraviolet light, similar to the transmission of sunlight. A well-structured hollow glass and a reasonably thick insulating glass spacer layer minimizes the transfer of energy due to radiation, thereby reducing energy loss.
Convection
Convection transmission is due to the temperature difference between both sides of the glass, causing air to fall to the cold side and rise to the hot side, causing air convection and energy loss. There are several reasons for this phenomenon. One is poor sealing between the glass and the surrounding frame system, which directly exchanges gas inside and outside the window frame, causing convection and energy loss. The other is the design of the internal space structure of hollow glass. Unreasonable, the gas inside the hollow glass causes convection due to the temperature difference, causing energy exchange and energy loss. Third, the temperature difference between the inside and outside of the windows that make up the entire system is large, causing a temperature difference between the inside and outside of the hollow glass. Larger, with the help of cold radiation and heat conduction, air first creates convection on both sides of the hollow glass and then passes through the entire hollow glass to form an energy loss. A rational hollow glass design can reduce gas convection, thereby reducing energy convection loss.
transmission
Conduction transfer transfers energy through the movement of object molecules and achieves the purpose of transmission in the same way as using an iron pan to cook and solder things with electrically soldered iron, hollow glass Energy is transferred through the glass and its interior. There is air. The thermal conductivity of glass is known to be 0.77 W / mk. The thermal conductivity of air is 0.028 W / mk. The thermal conductivity of glass is 27 times that of air, indicating that the presence of active molecules such as water molecules in the air affects the energy transfer and convection transfer performance of igu window. The main factor that improves the sealing performance of insulated glass door is an important factor in improving the heat insulating performance of insulating glass.
