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Green building strategies - thermal insulation glass

2015/12/14      view:
        In the south hot regions, there is still a certain blindness in the choice of energy-saving glass. A lot of people on the performance of energy-saving glass is still lack of understanding, think that the insulating glass is the best, of course, is the most expensive. For the energy-saving characteristics of glass, glass manufacturers do not understand; designers do not understand; Party A is not possible to understand, but it is natural to think: the most expensive must be the best! This is a misunderstanding.
        South area, what kind of glass is conducive to energy saving? In order to explore this problem, it is to analyze the thermal characteristics and the regional adaptability of various glass. Generally speaking, the glass can be divided into a transparent glass, a heat absorbing glass, a glass of low radiation glass, and a glass, which can be made into a hollow glass by its performance.
        (1) a transparent glass, a transparent glass, has almost the same reflectivity as a variety of spectra, and it has to be hot and fast. Its shade coefficient is very high, the barrier ability of the sunlight radiation is poor, most of the solar radiation heat energy through the glass into the room. During the summer, the heat energy of the transparent glass into the room is much larger than that of the glass. The insulation performance of the transparent glass is very poor.
        (2) the heat absorbing glass is made of a number of metal ions or certain substances through the glass, so that the glass has a number of colors to enhance the absorption of light. The shade coefficient of the heat absorbing glass is lower than that of the transparent glass, and the principle of the solar energy is weakened by absorbing the solar energy. The nature of this block is actually the absorption of radiation, and these are absorbed by the glass heat will eventually be delivered to the indoor and outdoor, but not to heat up in the outdoor.
Whether summer or winter heat absorbing glass, will cover part of the solar energy, so it can be used to heat the southern region, but not suitable for Northern area. The absorption glass has no effect on the spectrum, and it also prevents the projection of the visible light from the decrease of the light transmittance. Summer itself due to heat absorption will be hot, the radiation rate is high, the absorption of heat will be part of the radiation to the interior, can easily lead to discomfort.
        (3) the heat reflective glass is reflected in the surface of the metal film and some interference layer, so that the glass products can reflect more solar radiation, in order to achieve the effect of shading, and has a wealth of color. Heat reflective glass has a strong reflection on both visible and long wave radiation, which is to restrict the solar radiation into the interior. Heat reflective glass insulation and transparent glass is therefore not suitable for indoor not much difference between, for the cold area of high temperature difference.
        But in the light of strong heat, the heat insulation effect is very good, suitable for hot summer and warm winter area. Need to pay attention to the reflection of glass in the reflection of the sun's radiant heat, but also limited the access of visible light, the indoor lighting will cause adverse effects. In addition, high reflectivity can cause light pollution, too low and can not reach the effect of energy saving.
        (4) the low radiation glass, also called Low-E glass, is a low radiation (Low-E) coating formed on the surface of the glass by vacuum deposition technology. The function of the Low-E coating is reflected by far infrared radiation, which can reduce the heat transfer coefficient of the glass, and secondly, the thermal radiation in the sun, and has the choice of reducing the sun shading coefficient.
The biggest characteristic of Low-E glass is its spectral selectivity. In the manufacturing process can adjust the process to produce a variety of different optical properties, such as the sun, we are concerned about the shading coefficient, transmittance, etc.. In different regions or toward a different Low-E glass to achieve the best results. Suitable for the hot areas of the use of Low-E glass, the shade coefficient and transmittance are lower. In the heating area, the traditional high transparent Low-E glass with high transmittance and shading coefficient can be selected.
        (5) insulating glass has a higher thermal resistance, which can effectively prevent the indoor thermal conduction caused by temperature difference, and has very high thermal insulation performance, which is very suitable for the use of the north area. The dry and non - convection gas in the insulating layer of insulating glass can block the heat conduction, thereby limiting the temperature difference between the glass and the effective heat transfer coefficient. The interior is generally filled with inert gas to further reduce the heat transfer coefficient.
        The gas layer of insulating glass can not effectively restrict the transmission of solar radiation, so the contribution to improving the shading coefficient is limited. Insulating glass of the two layers of glass can be selected according to the need to meet the use requirements of various occasions. Transparent insulating glass, insulating glass, insulating glass, heat reflective insulating glass, Low-E insulating glass, etc..
        In general, the insulating glass is the largest increase in its thermal conductivity, rather than its thermal insulation properties. In the southern region of the summer, through the glass into the interior of the heat to heat radiation, and the room temperature difference between the inside and outside the room only a few, especially in the summer night, insulating glass of good insulation performance, so that the heat can not be distributed out of the interior, the energy saving but is unfavorable.