solar radiation
It consists of three parts: ultraviolet radiation with a wavelength of 300~380 nm, accounting for about 3% of the total radiation energy;
Visible light, the wavelength is 380~780 nm, and the energy accounts for about1/2 of the total radiation energy;
Infrared radiation, the wavelength is 780~2500 nm, and the energy accounts for about 1/2 of the total radiation energy.
ASHRAE standard
ASHRAE stands for American Society of Heating, Refrigeration and Air Conditioning Engineers. ASHRAE standards are formulated by the Association. The optical parameters and energy-saving indexes of CSG adopt American ASHRAE standard.
ASHRAE standard winter and summer test conditions
Winter conditions: outdoor temperature-18℃, indoor temperature 2 1℃, outdoor wind speed 24km/h, indoor air natural convection, sunshine intensity 0W/ m2 (at night).
Summer conditions: outdoor temperature 32℃, indoor temperature 24℃, indoor and outdoor wind speed 12 km/h, indoor air natural convection, sunshine intensity 783 W/ m (during the day).
Whether the shading coefficient Sc is as low as possible.
The shading coefficient is high, and more solar energy enters the room through the glass, which is beneficial to heating in winter; The shading coefficient is low, and less solar heat energy enters the room through the glass, which is beneficial to air conditioning and refrigeration in summer. In order to determine the appropriate building energy-saving coefficient, it is necessary to calculate the comprehensive energy-saving amount of buildings in a certain climate area in winter and summer. CSG Technical Service Department can provide energy consumption simulation calculation.
Does the outdoor far-infrared radiation come directly from the sun?
It comes from the sun indirectly, is absorbed by the object and radiated by the sun, and the wavelength range is 5~50 microns. In summer, the far infrared radiation heat emitted by outdoor roads and buildings after absorbing sunlight radiation is one of the main heat sources from outdoor.
How does Low-E glass work in summer and winter?
In winter, the indoor temperature is higher than the outdoor temperature, and far infrared radiation mainly comes from indoors. Low-E glass can reflect heat back to the room and prevent heat from leaking out. For outdoor solar radiation, the traditional Low-E glass can let it enter the room in large quantities. After being absorbed by indoor objects, this part of heat is converted into far infrared radiation and stays indoors.
In summer, the outdoor temperature is higher than the indoor temperature, and the far infrared radiation mainly comes from the outdoor. Low-E glass can reflect it out, thus preventing heat from entering the room. For outdoor solar radiation, shading Low-E can restrict it from entering the room, thus reducing the cooling cost (air conditioning cost).
What is a single silver low e? Double silver Low-E? Yin San Roy?
Ordinary off-line Low-E generally contains only a single layer of silver, which consists of more than five layers, of which the main functional layer is pure silver layer; Double silver Low-E is generally composed of more than 9 layers, of which the main functional layer is two layers of pure silver, which are separated by a dielectric film. Yin San Low-E is generally composed of 13 or more membranes, including three independent pure silver layers.
What are the advantages of double silver and triple silver Low-E?
Any coated glass not only limits the solar thermal radiation, but also limits the visible light. On the premise of the same light transmittance, the shading coefficient Sc of Double Silver Low-E and Triple Silver Low-E is lower, which can filter sunlight into a cold light source to the maximum extent. The following figure shows the transmittance curves of different coated glasses in solar energy band.
How to divide the use function of Low-E membrane
In the national standard, Low-E film can be divided into traditional type and sunshade type according to its function. All shading coefficients Sc≤0.5 belong to shading type, and all shading coefficients SC > 0.5 belong to traditional type. It has nothing to do with whether the film layer is single silver, double silver or three silver low-e.
Functional differences between Low-E glass and heat reflective glass
Heat reflection coated glass can reduce the shading coefficient Sc of glass and limit the penetration of solar thermal radiation, but it cannot reduce the heat transfer coefficient U and the penetration of temperature difference heat transfer.
Low-E glass has a wide range of shading coefficient Sc, which can limit the penetration of solar thermal radiation as needed, and at the same time, it can effectively reduce the heat transfer coefficient U and reduce the penetration of temperature difference heat transfer.
What are the composite products of insulating glass?
The composite products of insulating glass generally include heat reflection coating hollow, Low-E hollow, interlayer Low-E hollow, colored glaze hollow, interlayer colored glaze Low-E hollow and so on.
What parameters are used to measure the sound insulation performance?
Measured by weighted sound insulation Rw or sound transmission level (STC), the unit is decibel (dB). China standard adopts Rw, and European and American standards mostly adopt STC. The meanings and values of these two parameters are equivalent.
What is the weighted sound insulation Rw of ordinary glass?
Filling argon into insulating glass can further reduce 1~2dB.
Product name glass structure rw (db)
Single glass 6mm 26
Single glass10mm29
Insulating glass 6mm+9a+6mm 33
Insulating glass 6mm+ 12a+6mm 35
Laminated glass 6mm+1.14pvb+6mm 35.
What's the climate in the area where you work?
Climate zoning mainly represents cities.
Harbin, Qiqihar, Mudanjiang, Manzhouli, Jiamusi, Yichun and Karamay.
Zone B in severe cold area includes Shenyang, Changchun, Fushun, Yanji, Tongliao, Siping, Benxi, Anshan, Dandong, Datong, Hohhot, Zhangjiakou, Urumqi, Turpan, Xining, Yinchuan and Jiuquan.
Cold areas such as Beijing, Tianjin, Shijiazhuang, Dalian, Xi, Lanzhou, Taiyuan, Jinan, Qingdao, Zhengzhou, Luoyang, Xuzhou and Kashgar;
Shanghai, Nanjing, Hangzhou, Ningbo, Hefei, Wuhan, Changsha, Nanchang, Guilin, Chongqing, Chengdu, Guiyang and Shaoguan are hot in summer and cold in winter.
Guangzhou, Shenzhen, Nanning, Fuzhou, Xiamen, Shantou, Liuzhou, Haikou and Wuzhou in hot summer and warm winter areas;
Main indicators of "Design Standard for Energy Efficiency of Public Buildings"
U-value (w/m2 k) and shading coefficient Sc (southeast, west/north) of envelope climate zone.
Shape coefficient ≤ 0.3 0.3