The eyes are the windows of the human mind, and the windows are the eyes of the building. The idea of ​​a building, the soul of a building, needs to be represented by windows, so windows are a vital part of the building. In addition to its decorative functions, doors and windows have six aspects of function: water tightness, air tightness, wind load, and sound, light, and heat. The key points related to building energy conservation are light and heat performance.
Energy-saving doors and windows, building is more energy efficient
In general building construction, window heat transfer accounts for about 22%, and the heat transfer loss of the window gap accounts for about 50% of the total energy consumption of the building. Doors and windows are mainly composed of profile frame and glass. The proportion of glass in doors and windows is very large. The ratio of frame to glass of general steel and aluminum alloy window is 20:80, and the window of plastic window is 35:65. The glass fiber reinforced plastic and wooden window are insulated by heat. The reasons for the good effect and high intensity are not strictly defined, but basically between the two. Therefore, the glass has a great influence on the heat transfer coefficient of the doors and windows. The heat retention of the glass of the same orientation area is 8 to 15 times that of the same facing wall. As the country's energy control requirements for buildings are higher and higher, the construction The application of glass has also been improved from ordinary single glass to energy-saving glass such as double glass, triple glass and Low_E hollow. For doors and windows, everyone is accustomed to using the material of the frame to refer to the door and window, because for the same specification of doors and windows, the glass is the same, the performance parameters are also fixed, the factors affecting the performance of the door and window become The material of the door and window frame, the different materials, the heat insulation of doors and windows, sound insulation, sealing, anti-corrosion and other properties are also different.
Different materials, diverse
There are many types of building doors and windows. In general, it includes two categories of industrial and civil doors and windows. In the international arena, doors and windows are divided according to the development order of functions, which can be roughly divided into four generations: the first generation is lighting windows, ventilation and ventilation windows, perspective or overlooking doors and windows; the second generation is enclosure or security doors and windows, decorative doors and windows; third On behalf of energy-saving windows, insulation windows, heat insulation windows, sealed windows, soundproof windows and anti-corrosion windows, etc.; the fourth generation is smart windows, mainly including breathing windows, induction windows, remote control windows and anti-bacterial environmental protection windows. Doors and windows are broken down according to the development of productivity. In essence, it is based on the order of the doors and windows of different materials. It can be divided into three generations: the first generation is wooden doors and windows; the second generation is metal doors and windows, including steel doors and windows, aluminum alloy doors and windows, copper doors and windows, etc. The third generation is plastic doors and windows, including PVC doors and windows and fiberglass doors and windows.
In China, the interior of the industry usually replaces doors and windows in chronological order, namely, wooden doors and windows, steel doors and windows, aluminum alloy doors and windows, PVC doors and windows, and FRP doors and windows.
Wooden doors and windows: wooden doors and windows are traditional doors and windows made of wood. The wooden doors and windows are easy to process and produce. It has the earliest and longest application history. Until now, the world's high-grade doors and windows are still wooden. Wooden doors and windows have many characteristics: they can be "plastic" and have many kinds of wood. The appearance of doors and windows is simple, elegant, solemn and lively. The thermal conductivity of wood is very small. Wooden windows can obtain good energy-saving effects as long as the airtightness is improved. However, the strength of wood is limited, it can't adapt to the processing of large-area doors and windows, and it has poor fireproof, insect-proof and anti-corrosion properties. It is deformed by moisture and needs regular maintenance. As of the fifth national forest resource inventory in 2006, China's forest coverage rate only accounts for 16.55% of the national area. The timber resources are limited. The world is banned from protecting the environment and protecting the ecology, so that the use of wooden doors and windows is restricted. .
Steel doors and windows: Steel doors and windows have been widely used in the 1980s. It has made important contributions to reducing wood consumption. Steel doors and windows have high strength, small material section and large light transmittance, which can obtain a large lighting coefficient. Durable and fire resistant. The development of steel doors and windows has also experienced four stages of solid steel doors and windows, open steel doors and windows, color steel doors and windows and broken steel doors and windows. At present, more steel doors and windows are used. Solid steel doors and windows and open steel doors and windows are early steel doors and windows. Although these doors and windows have the advantages of small cross section, they also have poor air tightness, poor water tightness, poor sealing, and are not resistant to corrosion, especially in coastal salt. In the foggy area and the southern part with high humidity, the thermal conductivity is large and the appearance is poor. The convection and conduction in the use of doors and windows are large and the heat loss is large, which is a high-energy-consuming product.
Aluminum alloy doors and windows: aluminum alloy doors and windows are the third generation of doors and windows that appear after wooden doors and windows and steel doors and windows. They have good appearance and usability in appearance and structure, instead of wood doors and windows and steel doors and windows to occupy the door and window market. As early as the 1930s, trial production began in Europe and the United States. After World War II, due to advances in aluminum industry technology, the development of aluminum alloy door and window curtain walls provided substantial building materials, thus making aluminum doors and windows from the 1950s. It began to develop systematically, and its excellent properties have become the most widely used metal materials in the modern construction industry except steel. China introduced European, American and Japanese technical equipment from the mid-1980s. The main technical systems are from Italy and Germany in Japan and Europe. The development of aluminum alloy doors and windows has also gone through three stages: the early single aluminum doors and windows, the current color aluminum doors and windows and the broken aluminum alloy doors and windows, the most widely used color aluminum doors and windows. Inferior aluminum alloy doors and windows have led to endless inferior engineering phenomena. At the same time, the government's supervision is not enough, and it has caused very bad effects in the society. Coupled with the requirements of energy-saving performance, PVC doors and windows have sprung up and developed rapidly in China.
Plastic (PVC) doors and windows: Plastic (PVC) doors and windows are the fourth generation of doors and windows developed after wood, steel and aluminum. In 1955, Nobel produced the first plastic window. Later, in 1959, Hearst first exhibited PVC door and window samples at the World Exhibition held in Düsseldorf, Germany. Since then, the world's first plastic doors and windows have been promoted and applied for more than 50 years. history. Plastic door and window technology in the United Kingdom, the United States, France, Switzerland, Denmark and other countries have been introduced and rapidly developed in Germany. At present, the market share of plastic doors and windows in Europe is 40%, and that in Germany is 54%. The United States has grown to 45%. According to authoritative data, the average occupancy rate of plastic doors and windows worldwide has reached more than 20%. China has introduced Italian and German plastic door and window technology since the 1980s. After nearly 30 years of development, it has reached the level of Germany in the late 1990s, and the domestic market share is around 35%.
FRP doors and windows: FRP doors and windows, is a new type of doors and windows after wood, steel, aluminum and plastic. FRP doors and windows integrate anti-corrosion, heat preservation and energy-saving performance of other types of doors and windows, and have their own unique properties: no expansion under direct sunlight, no shrinkage in cold climate, no need for metal reinforcement for light weight and high strength, long service life Its comprehensive performance is superior to other types of doors and windows. It has excellent characteristics and beautiful appearance, which fully meets the requirements of modern society for energy saving and environmental protection of building doors and windows. It has many characteristics such as light weight, high strength, good sealing performance, energy saving and heat insulation, sound insulation, anti-corrosion insulation, good dimensional stability, good weather resistance, etc. In addition, FRP doors and windows are rich in color, and are treated with special surface treatment and scrub resistance. It does not fade, looks comfortable and generous, and the price is moderate, suitable for medium and high-end consumption, in line with the development of China's door and window industry.
10 zones door frame metal detector:
Fireproof, waterproof, shockproof design, dual-zone or single-zone alarm can be set, and 10 sections can be used to subdivide the human body parts.
10 zones door frame metal detector can accurately determine the specific location of metal objects in the human body and be used for inspections in factories, exhibition halls, etc. Suitable for export.
10 Zones Door Frame Metal Detector
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