Passivante

Passivante is a term used in the context of passive house design and construction. It refers to the practice of incorporating passive design strategies to achieve high levels of energy efficiency and comfort in buildings. The goal of passivante is to minimize the need for active heating and cooling systems by utilizing natural processes and the building's envelope to regulate internal temperature and air quality.

Key principles of passivante include:

1. Insulation: Thick insulation layers are used to reduce heat transfer through the building envelope. This helps in maintaining a consistent internal temperature throughout the year.

2. Airtightness: The building is made as airtight as possible to prevent drafts and reduce the loss of heated or cooled air. This is typically achieved through detailed construction techniques and the use of airtight seals.

3. Ventilation: While the building is airtight, it is also designed to provide adequate ventilation. This is often achieved through mechanical ventilation with heat recovery (MVHR) systems, which exchange outdoor air with indoor air while minimizing heat loss.

4. Solar Orientation and Shading: Windows are oriented to maximize solar gain in winter and minimize it in summer. Shading devices such as overhangs, awnings, or external shutters are used to control solar heat gain.

5. Thermal Mass: Materials with high thermal mass, such as concrete or brick, are used in the building's construction. These materials absorb and release heat slowly, helping to stabilize internal temperatures.

Passivante buildings typically require much less energy for heating and cooling compared to conventional buildings. This not only reduces operational costs but also contributes to lower greenhouse gas emissions, making it an environmentally friendly approach to construction. The Passivhaus Institute, based in Germany, is a prominent organization that promotes and certifies passivante buildings.