1. Basic performance requirements for the transparent part of uPVC windows to the outside world:

The performance of the transparent part of the glass is the most complex, and the following requirements must be met at the same time:

1) The heat transfer coefficient of glass should satisfy K≤0.8W/(㎡.K).

2) The total solar transmittance of the glass is G≥0.

3) The selectivity coefficient S of the glass is as large as possible, and meets the requirement of S=TL/g≥1.25; where TL is the visible light transmittance.

2. Selection of profiles:

The heat transfer coefficient K of the profile of the uPVC window frame outside the house should be determined according to the method specified in the current national standard "Classification and Testing Method of Thermal Insulation Performance of External Doors and Windows of Buildings" GB/T 8484, and meet the requirements of K ≤1.3W/(㎡·K).

3. Selection of sealing material:

The uPVC windows used in engineering in our country generally ignore the sealing materials of uPVC windows. The outer uPVC windows of passive houses should be sealed with three sealing materials with good durability.

4. Requirements for airtightness, watertightness and wind pressure resistance of external uPVC windows:

The outer uPVC windows should have good air tightness, water tightness and wind pressure resistance. According to the current national standard "Classification and Testing Methods for Airtightness, Watertightness and Wind Pressure Resistance of Building Exterior Doors and Windows" GB/T7106, the airtightness grade should not be lower than grade 8, the watertightness grade should not be lower than grade 6, and the wind resistance grade should not be lower than grade 6. The pressure performance grade should not be lower than grade 9.

5. Installation requirements for uPVC windows:

Unlike the uPVC windows outside the ordinary house, which are generally installed in the uPVC windows hole, the uPVC windows outside the passive house are generally installed on the outside of the outer wall. This installation method can reduce heat loss by about 20%. The connection between the outer uPVC windows and the wall is a complete sealing connection system composed of waterproof and vapor-permeable membrane, waterproof and gas-proof membrane and sealant.