[China Aluminum Industry Network] First, wind pressure strength and water tightness:
Because steel doors and windows have low material strength and rigidity, they have been strengthened by adding linings, but their wind pressure resistance and watertightness are about two grades lower than aluminum alloy doors and windows. This is the case for the standard sample screen submitted by the company, and the sample for the construction site. Shanghai Construction Curtain Wall Testing Center adopts the average value of the “three performances†measured by the witness sampling method for aluminum alloy doors and windows and plastic steel doors and windows installed on the construction site; “In addition to airtightness, the watertightness and wind pressure resistance performance of plastic steel doors and windows are Compared with aluminum alloy doors and windows, this result is unexpected, but after further analysis, it reflects the important issues in the quality of steel doors and windows." Moreover, because the lining steel of steel doors and windows is not connected to the complete frame system at the corners of the inner corners of its profiles, the plastic welding angles of the window frames, the four corners of the fan, and the small-sized dots are relatively low.
Second, airtight performance:
Because the steel doors and windows are welded by the frame and fan components, their airtightness should be slightly better than the aluminum alloy doors and windows connected by screws. However, the aluminum alloy door and window profiles have higher dimensional accuracy, and the frame and fan are more closely matched, so the two are still in One level up.
Third, insulation performance:
Aluminum alloy six-window insulation performance is not as good as steel doors and windows, but because, according to the thermal conductivity of the window calculation formula k=1/(1/ai+Rw+1/ae) window heat transfer coefficient k value depends not only on the form itself The heat transfer resistance Rw (reciprocal of the heat transfer coefficient of the form itself) also depends on the form. The indoor and outdoor surface heat exchange coefficients ai and ae; and according to another calculation formula k = k box f + k glass (1-f), the heat transfer coefficient of the window k value from the window frame, fan components and window glass The composition of the k-frame and k-glass of the second part is directly related to the ratio f of the window frame fan occupying the entire window area, while the frame fan of the aluminum alloy window accounts for about 10% of the entire window area than the plastic steel doors and windows, and the profile of the aluminum door frame and window fan is also Not solid, and the hollow aluminum wall thickness (actual thermal bridge) is about 40% smaller than the plastic profile wall thickness.
Fourth, lighting performance:
The steel doors and windows have poorer daylight performance than aluminum alloy doors and windows, and the shading area of ​​the frame sash components is about 10% greater than that of aluminum alloy doors and windows. The visual field and decorative effect are poor, which is not conducive to energy saving and consumption reduction of architectural lighting.
Fifth, sound insulation performance:
The sound insulation performance of the window is mainly the sound insulation effect of the glass that accounts for about 80% of the window area. The gap sealing level of aluminum alloy doors and windows and plastic steel doors and windows are basically the same, and its sound insulation performance is basically the same. Shanghai Institute of Building Research conducted a series of sound insulation performance tests and comparative experiments on plastic steel doors and windows and aluminum alloy doors and windows (6); 5mm thick single glass steel doors and windows sound insulation is about 21~24dB; 5+12A+5 hollow single-frame double glass steel doors and windows is 24~29dB; double glass sound insulation is 5dB larger than single glass; plastic steel doors and windows and aluminum alloy doors and windows "At least the thickness, the same structure, and the similar sealing conditions, the same amount of sound insulation RW value."
Six, fire performance:
Fire-retardant pvc plastic doors and windows have better fire resistance than flammable wood doors and windows, but they are inferior to non-combustible aluminum doors and windows. Polyvinyl chloride plastic is a non-flammable material. Under the effect of fire, it will burn slowly after encountering an open flame, and it will self-extinguish if it is away from the fire. The flame-retarding mechanism is the release of hydrogen chloride during combustion, which has the function of capturing H, OH, and free radicals, and becomes flame-retardant<7>. HCLCOCO2 and other toxic gases are emitted when burning. The hazard of smoke is the main reason for the heavy casualties caused by fire in the building. Therefore, some countries in Europe stipulate that public buildings must not use pvc doors and windows to avoid unnecessary harm. About the fire performance of doors and windows: steel doors and windows are relatively good, plastic doors and windows are relatively poor.
Seventh, on lightning protection and static electricity issues:
Aluminum alloy is a good electrical conductor, so when it is used as a building peripheral structure, effective grounding measures can be used as a lightning protection facility and can prevent the generation of static electricity; pvc plastic is a non-conductive insulator when it is used in high-rise buildings (a More than 30m of lightning-protection buildings, over 45m of Category II, and over 60m of Category III) cannot solve the problem of side-by-side lightning strikes. Moreover, if it is not used for antistatic treatment, it will be difficult to clean the electrostatic dust and dirt when it is used in civil buildings, and it will affect the appearance and decoration. For industrial buildings, it cannot be used in dust and other explosive shops, electronic or electrical assembly workshops and computers. Room and so on. According to information, electrostatic fire protection for plastics can be applied on the surface with an anti-static oil agent containing quaternary ammonium salt, which can absorb moisture in the air and increase the electrical conductivity. However, the current domestic plastic doors and windows are not treated with anti-static coating.
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