Doors and windows, known as the eyes of architecture, are an important part of the building. They not only provide rich decorative effects for the building facade, but also play an important role in controlling building energy consumption. With the topic of building energy saving more and more attention, the basic function of doors and windows is also more and more attention.
In the test of building doors and windows, what are the physical properties corresponding to the three basic functions? What are the requirements of the test?
Three properties of doors and windows
The three properties of doors and windows generally refer to air tightness, water tightness and wind pressure resistance, which are required in the inspection of building external doors and windows. There are clear requirements for the three basic performance tests of doors and windows in the standards GB / T 7106-2008 and JG / T 211-2007
Air tightness, also known as air permeability, refers to the ability of external doors and windows to prevent air penetration when they are normally closed. The air tightness of exterior doors and windows has great influence on heat loss. The better the air tightness is, the less heat exchange will be and the less influence on room temperature will be. The air permeability per unit seam length and air permeability per unit area are taken as evaluation indexes when the pressure difference between inside and outside the window is 10Pa under standard state.
Watertight performance refers to the ability to prevent rainwater leakage under the action of wind and rain at the same time when the doors and windows are normally closed. Generally, the standard used to test the water tightness performance of external doors and windows is in accordance with GB / T 7106-2008 "classification and test methods for air tightness, watertightness and wind pressure resistance of building external doors and windows", which specifies the requirements for testing equipment, performance testing methods and grading index of water tightness performance. The detection equipment simulates the simulation state of the external doors and windows in the storm weather. The pressure difference between the two sides of the external doors and windows is measured by the pressure supply system, water supply system, pressure measurement and water flow system, and then the pressure difference in case of serious leakage is determined, and finally the water tightness performance coefficient and grade of the external doors and windows are determined.
Wind pressure resistance
Wind pressure resistance refers to the ability of doors and windows not to be damaged (such as cracking, panel damage, local yield, bond failure, etc.) and hardware looseness, opening difficulty and other dysfunction when the doors and windows are normally closed. The test method is to test 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 air tightness and sound insulation effect of the building as a whole, which is of great importance in building energy-saving detection. The test of its basic three properties also needs to be carried out in strict accordance with the requirements
The test pieces shall be qualified products or developed according to the provided drawings, and shall not be attached with any spare parts or special assembly process or improvement measures. The test pieces must be assembled according to the design requirements, assembled well, and kept clean and dry. At least three specimens of the same type, structure and size shall be tested.
Test piece installation requirements
① The test piece shall be installed on the mounting frame.
② The connection between the test piece and the mounting frame shall be firm and sealed. The installed specimen shall be vertical and the lower frame shall be horizontal. The lower mounting frame shall not be higher than the drain hole outside the test piece chamber and shall not be deformed due to installation.
③ After the test piece is installed, the surface shall not be stained with dirt and other impurities.
④ After the test piece is installed, the part of the test piece that can be turned on should be turned on for 5 times, and finally be closed tightly.