Many high-end houses and even high-end villas only use double white insulating glass with poor thermal performance, which makes the thermal insulation performance of glass windows and walls far different; On the other hand, the thermal performance of glass materials accounting for the main area of external windows is poor, which can not reach the thermal level of wall materials, making external windows a major short board of building energy conservation.
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The use of vacuum glass window or curtain wall can effectively isolate outdoor noise and improve indoor sound environment.
For buildings in different climate areas, vacuum glass with different thermal performance can be selected according to local building energy-saving requirements.
Due to the poor thermal insulation performance of building envelope, the energy consumption of heating in winter and air conditioning and refrigeration in summer is high.
(2) Anti condensation: the super thermal insulation performance of vacuum glass can completely isolate the indoor and outdoor ambient temperature, and the anti condensation factor is > 75.
The heat transfer coefficient K of vacuum glass can be as low as 0.6W / (M2 • K), which is similar to the thermal performance of thermal insulation wall.
Even in the cold winter of minus 20 ℃ outdoors, the temperature difference between the indoor surface of glass and the indoor air will not exceed 5 ℃, which is much higher than the condensation temperature.
(3) For the needs of architectural appearance design, when a part of the enclosure structure can not meet the requirements of the specification and needs to be weighed and calculated, the thermal indicators of vacuum glass curtain wall can meet the requirements of weighing and judgment.
The thermal performance of vacuum glass should also be different for the daylighting surfaces in different directions of the same building.
Therefore, whether it is glass window or glass curtain wall, the transparent envelope is no longer the short board of building energy conservation, and the energy consumption of the whole building can be significantly reduced to meet the specified indicators of green building.
2、 Vacuum glass is a new type of energy-saving glass.
The energy consumption of public buildings with large area of glass curtain wall is higher.
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Therefore, it is necessary to develop an energy-saving glass with excellent thermal insulation performance, so that the glass window system and glass curtain wall system have thermal performance comparable to the wall, so as to balance the energy consumption of all parts of the building envelope and eliminate short boards.
Indoor environmental quality (1) noise: the weighted sound insulation of vacuum glass is more than 36dB, and that of composite vacuum glass is more than 40dB.
(2) Due to the needs of building functions, when the window wall area ratio exceeds the specification requirements and needs to be weighed and calculated, the thermal index of vacuum glass window can meet the requirements of weighing and judgment.
Under the action of atmospheric pressure, the two pieces of glass constituting the vacuum glass are closely combined into a whole and can not be cut, but can be combined with other glasses by means of glue or hollow, so as to form a composite vacuum glass to meet the needs of different projects such as doors, windows and curtain walls.
3、 Vacuum glass improves energy-saving indicators.
The thermal performance of the external window is 3 ~ 4 times worse than that of the external wall and roof, which makes the external window, which accounts for a small proportion of the total area of the building envelope, account for a high proportion of energy consumption.
Energy saving standard (1) the thermal insulation performance of vacuum glass is close to that of the wall.
1.
The difference between the glass indoor surface temperature and the room temperature is less than 3 ~ 5 ℃, which eliminates the serious cold and heat radiation, reduces the temperature gradient in front of the window, and significantly improves the indoor environmental comfort.
On the one hand, the reason for this phenomenon is the concept of energy conservation.
2.
1、 Building energy-saving industry standard analysis envelope is the key part of building energy-saving.
The key to reduce the energy consumption of glass external window (or glass curtain wall) is to improve the thermal performance of glass.
The application of vacuum glass can significantly improve the following performance indexes of the building in the theme planning specified in the green building evaluation standard, and improve the quality of the building.
Glass plays a very important and indispensable role in modern architecture.
Compared with ordinary hollow glass window or Low-E hollow glass window, the thermal insulation performance of vacuum glass window has obvious advantages.
(3) Comfort: vacuum glass has super thermal insulation performance, which is easy to maintain indoor constant temperature and humidity.
The thermal insulation performance of commonly used window frame profiles is poor, and the energy-saving effect of glass, which accounts for the absolute majority of the window area, is often ignored.
Vacuum glass can be selected to be composed of glass with different thickness, different varieties or different functions.
At the same time of heat insulation, it also has the characteristics of sound insulation and noise reduction, anti condensation and improving comfort.
The demand for energy-saving glass in modern buildings is becoming more and more urgent.
The heat transfer coefficient and shading coefficient of vacuum glass can be designed and selected according to requirements.
Because there is no gas heat transfer and there is a transparent low radiation film on the inner surface which plays the role of silver film of thermos bottle, the thermal insulation performance of vacuum glass is much better than that of hollow glass which has been widely used at present.
Pay attention to thermal insulation in cold areas of North China to minimize indoor heat loss; The hot summer and cold winter areas in the South should not only pay attention to thermal insulation in winter, but also pay attention to thermal insulation in summer to reduce the entry of solar radiant heat in summer.
China has begun to implement the evaluation standard for green buildings, which makes vacuum glass technology and products develop rapidly and widely used.
Therefore, the national and local standards on building energy conservation have rigidly stipulated the window wall area ratio of each direction, which is a last resort to limit building energy consumption.
Based on the principle of thermos bottle, the two pieces of glass are sealed around to form a thin vacuum layer of 0.1 ~ 0.2mm between them.
According to the actual test of the national construction engineering quality supervision and inspection center, the vacuum glass window can save more than 50% energy in winter when it is used in cold areas such as Beijing.
Therefore, vacuum glass has different heat transfer coefficient and shading coefficient to meet the thermal requirements of different climate areas.
