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One or two of the two flat glasses that make up the vacuum insulating glass are Low-E glasses· A square arrangement of pillars, each measuring between 0·1 and 0·2 mm in height, divides the glass plates· Glass solder is wrapped around the two glass pieces to seal them· On one piece of glass, there is an exhaust port where a getter is installed· A sealing piece is used to seal the exhaust port after vacuum exhaust, creating the vacuum cavity· Low heat transfer coefficient and good sound insulation performance are two qualities of windows with vacuum insulating glass, which can be used for heat insulation, condensation prevention, energy conservation, noise reduction, and other purposes·
Three methods are available for achieving heat transfer: convection, radiation, and conduction· Since vacuum insulating glass contains almost no gas molecules, heat conduction and convection are significantly reduced· In contrast, Low-E glass performs significantly better in terms of thermal radiation· The vacuum insulating glass performs better in terms of thermal insulation as a result·
Heat transfer occurs in three ways:
Conduction
Heat transfer in objects is a phenomenon that cannot occur in a vacuum·
Convection
When fluids flow, the phenomenon of heat transfer takes place· Without air in a vacuum and water, convection cannot occur·
Heat Radiation
Low-E coating significantly reduces radiation heat transfer
Why vacuum insulating glass is a good choice
Thermal insulation
The conductivity of heat Vacuum insulating glass has a U of as little as 0·38W/m2·K·
The weak point in a building’s insulation is its doors and windows· Doors and windows lose fifty percent of the energy used in buildings, and over seventy percent of these openings are made of glass· Vacuum insulating glass keeps the interior temperature comfortable, greatly insulates the exchange of hot and cold air, and dramatically improves the thermal insulation performance of doors and vacuum glazed windows·
Sound insulation
A single vacuum-insulating glass’s weighted sound insulation can reach 39 dB, while a composite vacuum-insulating glass can reach 42 dB·
The vacuum layer of vacuum insulating glass effectively stops sound transmission· Weighted sound insulation values for single and composite vacuum insulating glass are 39 and 42 dB, respectively· One of the major risks to the lives of those who live close to airports, expressways, and major thoroughfares is noise pollution· Traffic-related low- and medium-frequency noise can be effectively isolated with vacuum-insulating glass· It is a wiser decision to address life’s noise and establish a peaceful area·
Prevention of condensation
If ordinary insulating glass with a single cavity is used, the indoor side glass will begin to condense when the outdoor ambient temperature drops below 1·6 ℃, even at 20 ℃ and 65% relative humidity· When the indoor side glass is made of single cavity Low-E insulating glass, it will begin to condense when the temperature falls below -12·5 °C· When the indoor side glass with vacuum insulating glass is used, it will begin to condense at temperatures below -35 °C·
Lighter and thinner
The vacuum insulating glass has a simple structure, is lighter, and offers a wider range of optical parameters when compared to insulating glass, which must increase the number, thickness, and number of Low-E glasses in order to reduce the heat transfer coefficient·
Wide application
Vacuum insulating glass can be used on the facade, slope, and roof of the building without compromising its excellent performance (U value)· When the insulating glass is positioned horizontally, gas convection increases and the U value is enhanced significantly, making vacuum insulating glass a better choice for daylighting roofs·
Suitable for plateau area
In a plateau area, the average air pressure is less than 0·85, whereas in a plain area, it is one atmospheric pressure· It is prone to failure and cracking when used in plateau areas; however, since the vacuum insulating glass has almost no internal pressure, cracking will not occur in these conditions· However, because of the slight pressure difference, the vacuum insulating glass’s safety is increased and its atmospheric pressure and stress are decreased·
Longer life
Inorganic nonmetal materials are used to seal the edge of the vacuum insulating glass, which can better protect the Low-E coating in a vacuum state without aging it· The real service life of vacuum insulating glass is extended to 30 years by its getter, pillar, and high temperature exhaust technologies·
