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Characteristics working principle of insulating glass

2020-03-07 07:35:53

Insulating glass is a good heat insulation, sound insulation, beautiful applicable, can reduce the building weight of the new building materials, it is with two ( three) pieces of glass, the use of high strength high air tightness composite binder, glass aluminum alloy frame containing desiccating agent bond, made of high-efficiency sound insulation glass. Insulating glass is superior to ordinary double-layer glass in a variety of properties, so it has been recognized by the world, insulating glass is two more pieces of glass with effective support evenly separated sealed around the bond, so that there is a dry gas space between the glass products. Its main material is glass, aluminum spacer, Angle bolt, butyl rubber, polysulfide adhesive, desiccant.


Characteristics of insulating glass


1, superior energy-saving effect: modern building energy consumption is mainly air conditioning lighting, the former accounted for 55% of the energy consumption, the latter accounted for 23% of the energy consumption, glass is the thinnest building in the outer wall, the most easily heat transfer material. Insulating glass because the desiccant in the aluminum frame through the gap above the aluminum frame makes the air inside the glass hollow keep dry for a long time, so the temperature insulation performance is excellent.


2, height of sound insulation: insulating glass can reduce the noise 27-40 decibels, outside 80 decibels of traffic noise to the indoor, only 50 decibels.


3, eliminate frost dew: indoor outdoor temperature difference is too large, the single glass will frost. Insulating glass as a result of indoor air contact with the inner glass by the air layer, even if the outer contact is very low, will be exposed to the surface of the glass due to the temperature difference. Dew point of insulating glass up to -70℃(excluding strip insulating glass)


4. Improvement of wind compressive strength: the curtain wall mainly bears the wind load, the wind compressive strength becomes the main index of the curtain wall. The wind compressive strength of insulating glass is 15 times higher than that of monolithic glass


5, glass is easy to self-explosion: insulating glass production method for the bonding method, for cold processing, the original glass internal stress does change, surrounded by elastic material sealed, glass is easy to self-explosion.


6, coated glass film layer will fall off: coated glass metal film surface can be exposed to the air for a long time, coated insulating glass metal film surface in the dry sealing air will never fall off.


7, the original piece of glass will burst: in the air conditioning room, summer single glass outside by direct sun, heat, there is a temperature difference between the glass, when the temperature difference is too large, the glass will burst. This phenomenon exists in insulating glass.


8. Application scope of insulating glass: doors Windows of high-grade buildings, ceiling, schools, hospitals, stadiums, TV radio recording studios that need sound insulation, etc., also used in refrigeration appliances, aircraft, ships, locomotives other fields.


How insulating glass works


Because there are desiccant which can absorb water molecules inside the insulating glass the gas is dry, when the temperature drops, there will be no condensation inside the insulating glass. Meanwhile, the dew point on the outer surface of the insulating glass will also rise. For example, when the outdoor wind speed is 5m/s, the indoor temperature is 20℃, the relative humidity is 60%, 5mm glass begins to dew at the outdoor temperature of 8℃, 16mm(5+6+5) insulating glass under the same conditions, the outdoor temperature is -2℃ before the dew, 27mm(5+6+5+6+5) three layers of insulating glass at the outdoor temperature of -11℃ began to dew.


There are three modes of energy transfer in insulating glass: radiation, convection conduction.


1. Radiation transmission


Radiation is the transfer of energy in the form of radiation by rays, which include visible, infrared, ultraviolet radiation, just like the sun's rays. The reasonable arrangement of insulating glass the reasonable thickness of insulating glass spacer layer can greatly reduce the energy transfer in the form of radiation, so as to reduce the energy loss.


2. Convection transmission


Convection is due to the temperature difference on both sides of the glass, causing the air to fall on the cold side rise on the hot side, creating convection in the air, resulting in the loss of energy. There are several reasons for this phenomenon: first, the glass the surrounding frame system seal is poor, resulting in the window frame inside outside the gas can be directly exchanged convection, resulting in the loss of energy; Second, the internal spatial structure of the insulating glass is designed reasonably, which leads to the convection of the gas inside the insulating glass due to the action of temperature difference, driving the exchange of energy resulting in the loss of energy. Thirdly, the temperature difference between inside outside of the window that constitutes the whole system is large, resulting in the temperature difference between inside outside of the insulating glass is also large. With the help of cold radiation heat conduction, the air first generates convection on both sides of the insulating glass, then transmits the whole through the insulating glass, resulting in the loss of energy. The reasonable design of insulating glass can reduce the convection of gas the convection loss of energy.


3. Conduction


Conduction is through the movement of the object molecules, drive the energy to move, to achieve the purpose of transmission, just like cooking with an iron pot welding things with a soldering iron, insulating glass to the energy conduction through the glass its internal air to complete. We know that the thermal conductivity of the glass is 0.77w/mk. air coefficient of thermal conductivity is 0.028 W/mk, thus, the thermal conductivity of glass is the air 27 times, the presence of reactive molecules such as water molecules in the air, affecting hollow glass energy conduction convection transfer performance, the main factors thus improve the sealing performance of hollow glass, is an important factor to improve the performance of hollow glass heat insulation.

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