Passive House Doors and Windows
What is a Passive Building?
Passive buildings refer to achieving thermal insulation through the building's own systems.These buildings have excellent insulation and don’t require traditional AC or heaters. They utilize free heat from the sun, lights, and appliances. With a heat-recovery ventilation system, they only need minimal energy for heating and cooling.
Requirements for Passive House Doors and Windows
The passive house standard emphasizes continuous thermal insulation of the entire building envelope—free of thermal bridges or gaps—to ensure optimal comfort. For doors and windows in passive house projects, this requires prioritizing glazing configurations and thermal performance, including U-values and R-values:
U-Value: Measures the rate of heat transfer through doors/windows. Lower U-values indicate better thermal insulation of components or glazing systems.
R-Value: Measures the ability of insulation materials to resist heat/cold transfer—the higher the value, the better the performance.
Introduction to Passive House Doors and Windows
Passive house doors and windows feature a triple-glazed, double-chamber structure. The glass has a LOW-E coating, with warm-edge spacers between panes. The glass cavities are filled with argon gas (a common choice). Unlike regular windows where glass extends only 1.5cm into the frame, passive house glass extends 2-3cm. This design ensures better thermal insulation for passive house doors and windows.
Installation Requirements:
Passive house doors and windows are installed differently from regular ones. Ordinary windows are fitted near the interior wall, but passive House Windows are installed closer to the exterior wall. This setup can cut indoor heat loss by about 20%.
Where the outer window meets the wall, there’s a waterproof breathable membrane, a waterproof airtight membrane, and sealant. This design ensures the installation has excellent airtightness, which helps create a comfortable living environment.
Conclusion
Passive building energy efficiency is a complete engineering system. You need to consider energy saving, comfort, and safety. This includes things like insulation, sun shading, airtightness, wind pressure resistance, water tightness, sound insulation, daylighting, and durability.
It’s related to every step: design, material selection, installation, and maintenance. When it comes to materials, the performance of door and Window Profiles, glass, weather stripping, hardware, and accessories is crucial.
Overall, choosing doors and windows for passive houses needs a systematic approach. selecting high-quality products and professional installation. This ensures living comfort while reducing energy use and emissions to meet passive house requirements.
