Abstract: what are the required physical properties corresponding to the three basic functions in the test of building doors and windows? What are the requirements of the test?
Doors and windows are known as the eyes of the building, which is an important part of the building, which not only provides a rich decorative effect for the building facade, but also an important link to control the building energy consumption. With the topic of building energy saving getting more and more attention, people pay more and more attention to the basic functions of doors and windows.
What are the required physical properties corresponding to the three basic functions in the test of building doors and windows? What are the requirements of the test?
Three performances of doors and windows
The three properties of doors and windows generally refer to air tightness, watertightness and wind pressure resistance, which is a necessary inspection item in the inspection of building exterior doors and windows. the standard "classification and testing methods of air tightness, watertightness and wind pressure resistance of building exterior doors and windows" GB/T 7106 and "on-site testing methods for air tightness, watertightness and wind pressure resistance of building exterior windows" JG/T 211 have clear requirements for the testing of the three basic properties of doors and windows:
Air tightness, also known as air permeability, refers to the ability of outer doors and windows to prevent air infiltration when they are normally closed. The airtightness of the outer doors and windows has a great influence on the heat loss. the better the airtightness, the less the heat exchange and the smaller the effect on room temperature. The air permeability per unit seam length and the air permeability per unit area are used as the evaluation index when the pressure difference between inside and outside the window is 10Pa in the standard state.
Watertight performance refers to the ability to prevent Rain Water leakage under the action of wind and rain when the outer doors and windows are normally closed. Generally, the standard for testing the watertightness of exterior doors and windows is according to the "classification and testing method of air tightness, watertightness and wind pressure resistance of exterior doors and windows of buildings" GB/T 7106. The standard specifies in detail the requirements of testing equipment, the methods of performance testing and the classification index of watertightness performance. The testing equipment simulates the simulated state of the outer doors and windows in stormy weather, and measures the pressure difference between the two sides of the external doors and windows by using the pressure supply system, the water supply system and the pressure measurement and water flow system, and then determines the pressure difference in the case of serious leakage, and finally determines the watertight performance coefficient and grade of the outer doors and windows.
Wind pressure resistance.
Wind pressure resistance refers to the ability of no damage (such as cracking, panel damage, local yield, bond failure, etc.) and hardware loosening and opening difficulties under the action of wind pressure when the outer doors and windows are closed normally. The detection method is to detect the ability of the specimen to resist damage and dysfunction under the action of instantaneous wind pressure.
How to test the performance of doors and windows?
These basic properties of doors and windows determine the overall air tightness and sound insulation effect of the building, which is very important in the detection of building energy saving. The testing tests of its three basic performances also need to be carried out in strict accordance with the requirements:
The test piece requires that the test piece should be a qualified product or developed sample produced according to the provided drawing, and shall not be accompanied by any extra parts or special assembly process or improvement measures. The specimens must be assembled and assembled in accordance with the design requirements, and kept clean and dry. The number of specimens of the same type, structure and size should be tested at least three times.
Installation requirements of specimen.
1. the specimen should be installed on the installation frame.
2. the connection between the specimen and the installation frame should be firm and sealed, the installed specimen should be vertical, the lower frame should be horizontal, the lower installation frame should not be higher than the outer drainage hole of the specimen room, and should not be deformed as a result of installation.
3. after the specimen is installed, the surface shall not be stained with unclean objects such as oil stains.
4. after the specimen has been installed, the part of the specimen can be turned on and off for 5 times and closed at last.
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