We know that the vacuum layer of vacuum insulating glass has extremely low thermal conductivity and high sound insulation performance, so vacuum glass is excellent heat insulation glass and sound insulation glass. So Can vacuum glass insulate the solar??
Let’s first take a look at the difference between door and window heat insulation glass and solar insulation glass heat insulating glass usually refers to preventing the transfer of indoor heat to the outside during winter, thereby maintaining an appropriate temperature indoors; Solar Insulation glass usually refers to the isolation of solar radiation heat and the transfer of outdoor high temperatures to the indoor environment in summer, ensuring that the indoor temperature is maintained appropriately.
From the above, it can be seen that heat insulating glass is about reducing temperature transfer. The lower the heat transfer coefficient, the better. In addition to reducing temperature transfer, insulation glass also needs to reduce solar radiation, which is not only related to the heat transfer coefficient of the glass but also to the shading coefficient of the glass.
The principle of solar insulating glass to block solar radiation: In order to achieve the expected shading effect (blocking solar radiation), general door and window glass will use sunshade type LOWE coated glass. This type of glass has a high reflectivity and absorption rate of solar radiation, thereby reducing the solar radiation that directly passes through the glass and enters the room. This transmittance is not determined by the thermal conductivity of the glass, but by the shading coefficient.
However, it should be noted that the absorbed part of the solar energy will be converted into temperature, which is why glass exposed to sunlight in summer will generate heat, even higher than the outdoor temperature. The transfer of this temperature and outdoor high temperature to the indoor environment is related to the heat transfer coefficient of the glass itself, and the vacuum layer of vacuum glass can also play a role.So the solar insulation effect of glass is determined by both the shading coefficient and the heat transfer coefficient of the glass, and the shading coefficient plays a key role.
So, there is no doubt that vacuum glass is not only an excellent heat preservation glass and soundproof glass, but also an excellent solar insulation glass. Although as a vacuum layer of vacuum insulating glass, it cannot fully exert its capabilities, the characteristics of thickness and thinness allow for flexible selection of sunshade. LOWE has better sunshade effect, and in addition, the characteristic of flat heat transfer coefficient not decaying is the best choice for sunlight rooms, daylighting roofs, and other areas that require excellent solar insulation glass.
