In winter, the indoor temperature is higher than the outdoor, and the far-infrared rays mainly come from indoors. Low-E glass can reflect it back indoors to keep the indoor heat from leaking out. Low-E glass can still allow part of the solar radiation from the outdoors to enter the room. This part of the energy is absorbed by indoor objects and then converted into far-infrared heat radiation and left indoors. In summer, the outdoor temperature is higher than indoors, and the far-infrared radiation mainly comes from outdoors. Low-E glass can reflect it out to prevent heat from entering the room. For outdoor solar radiation, Low-E glass with low shading coefficient can be selected to restrict its entry into the room, thereby reducing air-conditioning and cooling costs.
There are the following ten-glass surface emissivity, visible light transmittance, visible light reflectance, solar transmittance, solar reflectance, ultraviolet transmittance, total solar transmittance, shading coefficient, heat transfer coefficient, relative heat gain.
The spontaneous explosion of tempered glass can be expressed as the phenomenon that tempered glass breaks automatically without direct external action. Tempered glass can explode spontaneously during tempering processing, storage, transportation, installation, and use. Self-explosion can be divided into two types according to different causes: one is self-explosion caused by visible defects in the glass, such as stones, sand, bubbles, inclusions, notches, scratches, burst edges, etc.; the other is from nickel sulfide (NiS) in glass Self-explosion caused by the expansion of impurities.
The domestic spontaneous explosion rate varies from 3% to 0.3% among manufacturers. In order to uniformly measure the self-explosion rate, uniform conditions are set: 5 to 8 tons of glass contains one nickel sulfide sufficient to initiate self-explosion; the average area of each piece of tempered glass is 1.8 square meters; the nickel sulfide is evenly distributed. It is calculated that the self-explosion rate of 6mm-thick tempered glass is 0.34%～0.54%, that is, the self-explosion rate of 6mm tempered glass is about 3‰～5‰, which is basically consistent with the actual value of domestic high-level processing enterprises.
Both U value and K value are heat transfer coefficients, with different names under different test conditions. China calls the heat transfer coefficient K value under the national standard GB10294, and the heat transfer coefficient under the American ASHRAE (American Society of Heating, Refrigeration and Air-Conditioning Engineers) standard conditions is called the U value. At present, the U value under the American standard conditions is also widely used in China. The value is used as the basis for calculating the heat transfer coefficient.
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