Application of the hottest energy-saving glass in

2022-10-18
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Application of energy-saving glass in civil buildings

in building doors and windows and building exterior walls with glass curtain walls, glass is the most widely used component of exterior wall materials, and it is also the part that is most prone to heat transfer. Glass curtain wall buildings are also most affected by sunshine and outdoor temperature. Therefore, selecting appropriate glass varieties is a major measure for energy-saving control of doors, windows and glass curtain walls

energy saving glass mainly includes heat reflective glass, insulating glass, foam glass and solar glass, as well as PC board, a glass substitute that has been popularized and applied in recent years

1 heat reflective glass

heat reflective glass is also called coated glass. It uses various generation methods such as pyrolysis method, vacuum method, chemical coating method to coat the surface of the glass with metal or metal oxide films or non-metal oxide films such as gold, silver, copper, chromium, nickel, iron, etc., or uses electro flotation plasma exchange method to infiltrate metal ions into the surface of the glass to replace the original ions on the surface layer of the glass to form a heat reflective film, Heat reflective, heat reflective hollow and laminated heat reflective glass are manufactured. Heat reflective glass can obtain a variety of reflected light, which can map the surrounding buildings and natural scenery onto the colored glass curtain wall, making the whole building look extremely magnificent. At the same time, this product can reduce glare and make the working and living environment comfortable

single piece heat reflective glass can be directly used in curtain wall engineering, and can also be used to manufacture insulating glass and laminated glass. For example, if the insulating glass made of heat reflective glass and ordinary transparent flat glass is used to make glass curtain wall, its shielding coefficient is only about 10%, and the heat transfer coefficient is about 1. 74w/(m2. K), which is similar to the thermal insulation performance of 240mm thick brick wall. During curtain wall construction, it should be noted that the coated surface of coated glass should face indoors. A pencil can be used to judge the coating and observe its reflection position. If the reflection intersects with the pencil, this surface is the coated surface; If the reflection is staggered with the pencil, the surface is the uncoated surface

2 insulating glass

insulating glass is made of two or more pieces of glass glued together. The periphery of the two or more pieces of glass is separated by spacer frames and sealed with sealant, so that a dry gas space is formed between the glass layers. The thickness of the original piece of insulating glass can be 5, 6, 8, 10mm, and the thickness of the air layer can be 6, 9, 12mm. Insulating glass has the following characteristics:

(1) optical performance: if different glass original sheets are selected, they can have different optical properties, and the light transmission range of visible light is generally about 80%

(2) prevent condensation: if the indoor and outdoor temperature difference is large, the single-layer glass will condense; Dew is not easy to condense on the surface of double-layer glass. For the inner glass in contact with the indoor air, due to the influence of the air isolation layer, even if the outer glass is very cold, the inner glass is not easy to become cold, so condensation on the inner glass can be eliminated and reduced. The dew point of insulating glass can reach - 40 ℃. In general, the condensation temperature is about 15 ℃ lower than that of ordinary windows

(3) sound insulation performance: the insulating glass has excellent sound insulation performance, which can greatly reduce the outdoor noise. Entering the room through the glass can reduce the noise by dB, and can reduce the 80dB traffic noise to the level of about 50dB in a quiet room

(4) thermal performance: the overall thermal conductivity of insulating glass is almost reduced to half of a layer of glass, because it has an air layer between the two glasses. As a result, due to the reduction of indoor and outdoor temperature difference and the improvement of air efficiency, the thermal transmission energy is reduced, which is the most essential feature of insulating glass, so its thermal conductivity is much lower than that of ordinary flat glass, and its heat transfer coefficient is 1 23W/(m2.K)。

when insulating glass is selected for hidden frame glass curtain wall, it must be ensured that the second sealant of insulating glass must be silicone sealant and compatible with the sealant used for structural glass assembly, that is, both must improve the accuracy and reliability of experimental results, and compatible sealant must be used. When a silicone sealant is used for structural assembly, it is best to use the silicone sealant of the same factory as the sealant of insulating glass

insulating glass made of heat reflecting glass, heat absorbing glass, laminated glass and tempered glass must be distinguished between the front and back during installation. For example, when coated glass is used on the outside, the coated surface should face the air layer

the installation and construction of insulating glass should be carried out in strict accordance with the requirements of relevant construction specifications, to prevent the glass from cracking under the action of local uneven force, and there should be no direct contact between insulating glass and framed frame. The putty inlaid with insulating glass must be non hard curing type, and it does not contain substances that have chemical reaction with insulating glass sealant

when installing insulating glass, the working temperature should be above 4 ℃, and installation construction should not be carried out at a temperature below 4 ℃. In order to make better use of the energy-saving characteristics of insulating glass, insulating glass products composed of heat reflecting glass and heat absorbing glass can be used

3 polycarbonate board (PC board)

polycarbonate board is also called PC board, also known as transparent plastic sheet, or sunshine board or endurance board. It has similar light transmission performance with glass. Its main characteristics are impact resistance (impact resistance is 100 times that of glass), thermal insulation performance is better than glass, and it can be cold formed. It is an ideal daylighting pre purchase material. At present, it has become a key concern material for automobile manufacturers to develop new car parts. It is also used as the enclosure fence of closed balcony, canopy door bucket, partition, cabinet door, and can replace doors and windows and curtain wall glass. Because of its safety, permeability, heat preservation, easy bending, light weight, impact resistance, variable color and other characteristics, it is being promoted and applied in modern buildings

the disadvantage of PC board is that it turns yellow over time. Its surface wear resistance is worse than that of glass. Its linear expansion coefficient is 7 times that of glass, and its expansion and contraction is obvious when the temperature changes. However, with the continuous improvement of production technology and processing technology and the further improvement of material formula, its product quality and performance are also improving. Through the systematic comparative test, under the condition of the same thickness. Single layer PC board can save 10%-25% energy than glass, and double-layer PC board can save 40%-60% energy than glass. No matter heating in winter or cooling in summer, PC board can effectively reduce building energy consumption and comprehensive cost. Today, this has particularly significant social and economic benefits. 16mm thick double-layer PC boards are widely used in new houses in the cold regions of Hokkaido, Japan. Weather resistance: all physical indexes of PC board can maintain stability in the range of -40 ℃ -120 ℃. The low-temperature embrittlement temperature is -110 ℃, and the high-temperature softening temperature is 0 ℃

the surface of PC board is treated by high-tech light stabilization process, and the product has anti-aging function, which successfully solves the aging problem that other engineering plastics cannot solve. Anti condensation performance: under normal conditions, when the outdoor temperature is 0 ℃, the indoor temperature is 23 ℃, and the indoor relative humidity. When it reaches 40%, the inner surface of the lighting material glass will condense. With PC board, when the indoor relative humidity reaches 80%, the inner surface of the material begins to condense. Flame retardant performance: the self ignition temperature of PC board is 6, and the fixture is made of metal material 30 ℃. The PC board does not produce toxic gases such as cyanide, acrolein, hydrogen chloride, sulfur dioxide and so on during the combustion process (the products are non corrosive). After measurement, the smoke concentration during PC board combustion is far lower than that of wood and paper. In recent years, PC board has passed the strict examination and test of professional standards in the United States, Britain, Germany, France, Japan and other countries, and has been determined as a quasi combustible grade I material. Processing performance: PC single-layer board can be processed into various shapes by vacuum forming method and pressure forming method, and can also be formed by cold bending at room temperature. At room temperature, the minimum bending radius of PC double-layer plate is 180 times of the plate thickness, and the minimum bending radius of PC single-layer plate is 150 times of the plate thickness

4 conclusion

energy saving glass is an efficient, practical and beautiful building material, which plays an irreplaceable role in building energy saving system engineering. In the energy-saving design of buildings, the selection of energy-saving glass should follow the principle of "adjusting measures to local conditions, paying equal attention to appearance and lighting", and reasonably select the glass with suitable performance according to the climatic characteristics of different regions, which should not only consider the appearance effect, but also pay attention to the degree of lighting. At the same time, fully consider the impact of the type, configuration, emissivity, film surface position, spacer gas and other factors of energy-saving glass on the performance of energy-saving glass, avoid adverse factors, and make energy-saving glass provide 1billion euros in 10 years to support glass to play its most ideal energy-saving effect in building energy-saving projects, so as to achieve the purpose of reducing energy consumption. We believe that with the gradual deepening of the concept of sustainable development and the awareness of building energy conservation, high-performance energy-saving glass will continue to develop and have a broader market prospect

global glass () Department

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