Thermal performance of double glass curtain wall

The greatest advantage of double-layer structural glass curtain wall is shown in the thermal performance, and the biggest difference is also in the thermal performance. The double curtain wall has obvious greenhouse effect. As the name implies, the greenhouse effect is that the passageway of the double curtain wall, which can form a heat shield and prevent the indoor heat from flowing to the outdoor in winter and the outdoor heat from flowing to the indoor in summer, so that the indoor is in a relatively constant thermal environment. There are three forms of the greenhouse effect of the double curtain wall:

One is in the hot summer, the double curtain wall canal of air inlet and the outlet is opened entirely. Due to smokestack effect, the air will run from the bottom up, in the channel in the process of air operation, the heat out of the channel, and within the channel makes the inner wall of low temperature environment, to prevent heat from outside to inside, This is one of the manifestations of the greenhouse effect of the double channel curtain wall. However, this kind of greenhouse effect is dynamic and random, which can only be described qualitatively. At present, it can not be calculated quantitatively. Even if the calculation software is used to simulate the calculation, the accuracy of the results is not easy to evaluate. Secondly, during the winter, the double curtain wall in the channel of air inlet and air outlet were closed, still, the air in the channel in the sunlight, will have larger temperature rising, the air in the channel make the inner wall in high temperature environment, to prevent quantity of heat from indoor to outdoor, this is the second form of the greenhouse effect of double channel curtain wall facade. However, this kind of greenhouse effect is dynamic and random, which can only be described qualitatively. At present, it can not be calculated quantitatively. Even if the calculation software is used to simulate the calculation, the accuracy of the results is not easy to evaluate.

In summer, if the air in the double-layer curtain wall cannot take away the hot star in the channel in time, the temperature in the channel will gradually rise, usually reaching 50-60 degrees, or even higher, which is the basis for the formation of the view that the double-layer curtain wall is not energy saving. Due to the double modern curtain wall, even more than outdoor air temperature, in this case, originally should be determined by the outdoor to indoor heat environment, which is now within the channel heat to outdoor, namely the double curtain wall channel formed the thermal barrier, outdoor heat through.