What Is Insulating Glass?
Hollow glass by the Americans invented in 1865, is a good heat insulation, sound insulation, beautiful and reduce the weight of the building of new building materials, it is with two (or three) of glass, the use of high strength and high air tightness composite adhesive, glass and contains stem dry agent of aluminum alloy frame bond, made of high-performance insulating glass. A variety of performance of the hollow glass is superior to ordinary double glass, so it has been recognized by all countries in the world, the hollow glass is will of two or more than two pieces of glass to effectively support evenly spaced and surrounding bonded seal, so that the glass layer is formed between the dry gas space of glass products. The main materials are glass, aluminum spacer, corner bolt, Ding Ji rubber, poly sulfur adhesive, desiccant.
Heat insulation, sound insulation principle
There are three ways in which the energy is transferred, that is, radiative transfer, convection and conduction.
Radiation is a form of energy passing through the rays in the form of radiation, such as the radiation of visible, infrared and ultraviolet radiation, like the sun's rays. Rational allocation of hollow glass and reasonable insulating glass spacer thickness, maximum reduction of energy through the transfer, thus reducing the energy loss in the form of radiation.
Convection transfer is due to the two sides of the glass with a temperature difference, resulting in the cold side of the air in the hot side of the rise, resulting in air convection, resulting in the loss of energy. There are several reasons for this phenomenon: one is the poor sealing glass and the periphery of the framework of the system, causing the air inside and outside the window frame can directly exchange convection, leads to the loss of energy; the two is to design the internal spatial structure of the hollow glass is not reasonable, resulting in the air in the hollow glass convection due to temperature difference effect, driven by the energy exchange, resulting in energy loss; three is the temperature difference between inside and outside the structure of the whole system window is larger, resulting in hollow glass, the temperature difference between inside and outside is large, cold radiation and heat conduction through air, first produced on both sides of convection in the hollow glass, hollow glass and then through the whole transfer in the past, the formation of energy loss. Reasonable hollow glass design can reduce the gas flow, thus reducing the energy of the convection loss.
Conduction transfer is through the motion of object molecular, driven by energy movement, and achieve the purpose of passing, like with the wok, cook, and use the same electric soldering iron things, and insulating glass for energy conduction transfer is accomplished through the glass and its internal air. We know that the thermal conductivity of the glass is MK 0.77W/. The thermal conductivity of air is 0.028 w / MK. Thus, glass thermal conductivity is 27 times the air, and the existence of water molecules and other active molecules in the air is main factors that influence energy of hollow glass conduction transfer and convective transfer performance, thereby enhancing insulating glass sealing performance is the important factors to improve the insulation performance of hollow glass.
Anti condensation, reducing cold radiation and safety performance
Because in the hollow glass are desiccant adsorption of water molecules, the gas is dry, at lower temperature, the interior of the hollow glass can not cause condensation phenomenon. At the same time, in the hollow glass surface dew point will rise. As outdoor wind speed of 5m / s, indoor temperature of 20 DEG C, relative humidity is 60%, 5mm glass in the outdoor temperature for 8 DEG C to condensation, and 16mm (5+6+5) hollow glass under the same conditions, the outdoor temperature for - 2 DEG C when condensation, 27mm (5+6+5+6+5) three layers of glass in the outer room temperature is 11 degrees to condensation.
Because the hollow glass insulation performance better, on both sides of the glass temperature difference is bigger, can also reduce the effect of radiant cooling; when the outdoor temperature is - 10 DEG C, the temperature of indoor single glass window is - 2 DEG C and the temperature of the hollow glass window is 13 DEG C; in the same housing structure, when the outdoor temperature is 8 degrees C, the indoor temperature is 20 DEG C, 3mm ordinary single-layer glass cold radiation region accounted for 67.4% of the indoor space, and the use of double hollow glass 3+6+3 was 13.4%.
The use of insulating glass, can improve the safety performance of the glass, in the use of the same thickness of the original piece of glass, the wind pressure strength of the hollow glass is 1.5 times the ordinary monolithic glass.
1, ordinary insulating glass
Insulating glass is made up of two or more layers of flat glass. All around with high strength and high air tightness composite binder, two or more pieces of glass and sealing, glass adhesive, sealing. In the middle of the dry gas, the box is filled with desiccant, to ensure that the air of the glass film is dry. Various different properties of glass chips may be selected according to the requirements, such as colorless transparent float glass embossed glass, heat absorbing glass, heat reflective glass, wired glass, toughened glass and frame (aluminum frame and glass, etc.), after the cementation, welding or welding and made.
The hollow glass can be used for 3, 5, 6, 8, 10, 4, 12mm thickness of the original piece of glass, air layer thickness can be used 6, 9, 12mm interval.
(1) technical requirements for hollow glass
GB11944-89's requirements are as follows:
A. glass can be used for flat glass, laminated glass, embossed glass, heat absorbing glass, coating glass, tempered glass etc.. Float glass should be in accordance with the provisions of the GB11614 level, the first product, laminated glass should comply with the provisions of GB9962, tempered glass should comply with the provisions of GB9963.
B. sealant should meet the following requirements of the first, the second part of the seal between the color difference should be clear; the validity of the first half of the year; the curtain wall with second seals