Do You Know Why Doors and Windows Are Known as the Eyes of Buildings? Let Me Give You a Good Lesson!

Doors and windows are known as the eyes of the building and are an important part of the building. They not only provide rich decorative effects for the facade of the building, but also an important link to control the energy consumption of the building. With the topic of building energy conservation getting more and more attention, the basic functions of doors and windows, such as heat preservation, sound insulation and wind pressure resistance, are also getting more and more attention. In the test of building doors and windows, what are the required physical properties corresponding to the three basic functions? Three properties of Windows: three properties of doors and windows generally refer to the three properties of air tightness, water tightness and wind pressure resistance. It is a mandatory item in the inspection of outside doors and windows of buildings. The standard "air tightness, water tightness, wind pressure resistance performance classification and testing methods GB/T 7106-2008 and building exterior windows airtight, watertight, on-site test method for wind pressure resistance JG/T 211-2007 has clear requirements for three basic performance tests of doors and windows: Air tightness Air tightness, also known as air permeability, refers to the ability to prevent air penetration when the outer doors and windows are normally closed. The air tightness of external doors and windows has a great influence on heat loss. The better the air tightness, the less heat exchange, the influence on room temperature is also more accurate. The index to measure air tightness is the air permeability per unit seam length and air permeability per unit area when the pressure difference between inside and outside the window is 10Pa under the standard state. Water tightness Watertightness refers to the ability to prevent rainwater leakage under the simultaneous action of wind and rain when the outer doors and windows are normally closed. Generally, the standard used 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 7106-2008, this standard specifies in detail the requirements for testing equipment, performance testing methods and grading indexes of watertightness. The detection equipment simulates the simulated state of external doors and windows in stormy weather, and uses pressure supply system, water supply system, pressure measurement and water flow system to measure the pressure difference between both sides of external doors and windows, then determine the pressure difference during severe leakage, and finally determine the water tightness coefficient and grade of outer doors and windows. Wind pressure resistance Wind pressure resistance refers to the fact that the external doors and windows are normally closed without damage (such as cracking, panel damage, local yield, bonding failure, etc.) and the hardware is loose under the action of wind pressure, the ability to enable dysfunction such as difficulty. 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 detect the three performance of doors and windows? These basic properties of doors and windows determine the air tightness and sound insulation effect of whole architecture, which is very important in building energy conservation testing. The basic three performance testing tests also need to be carried out in strict accordance with the requirements: Test pieces require that the test pieces should be qualified products or developed test pieces produced according to the provided drawings, and should not be attached with any spare parts or adopt special assembly processes or improvement measures. Test pieces must be combined and assembled in accordance with the design requirements, and kept clean and dry. The number of test pieces of the same type, structure and size of the test pieces should be tested at least three times. Test piece installation requirements ① the test piece should be installed on the installation frame. ② the connection between the test piece and the installation frame should be firm and sealed. The installed specimen must be vertical, the lower frame must be horizontal, and the lower installation frame should not be higher than the outdoor side drainage hole of the specimen. No deformation should occur due to installation. ③ After the test piece is installed, the surface should not be stained with dirty materials such as oil stains. ④ After the test piece is installed, switch the test piece openable field for 5 times, and finally close it tightly. The detection sequence should be carried out in the order of air tightness, water tightness and wind pressure resistance (deformation P1, repeated compression P2 and safety detection P3). Detection security requirements Appropriate safety measures should be taken when wind pressure resistance performance testing or high pressure water tightness testing. [This article reprints the public Number of zhironghai design. Only information is transmitted. Please contact us to delete the infringement]] Edit: doors and windows online-Yanzi