Retractable Roof Systems with Building-Integrated Photovoltaics (BIPV).

The Active Envelope

The integration of photovoltaic technology into Airclos mobile enclosure systems represents a paradigm shift in contemporary architecture: the transition from a passive envelope to an energy-generating asset. Through BIPV technology (Building Integrated Photovoltaics), the retractable roof not only protects the space, but also acts as an on-site power plant, optimising the building’s operational efficiency.

Photovoltaic Technology Specifications

We understand Building Integrated Photovoltaics (BIPV) as the convergence between Airclos structural engineering and clean energy generation. Unlike conventional installations, the photovoltaic modules are integrated directly into the glass of the retractable roof, acting simultaneously as a protective envelope and an active power plant.

In line with the structure and operation of Airclos retractable roof systems, the photovoltaic panel is always installed on the fixed leaf of the retractable roof. This technical configuration ensures a static, protected connection, eliminating issues with electrical conductors and facilitating access for potential preventive maintenance work without interfering with the operation of the retractable system. At the same time, it guarantees the correct operation of both the mobile system and the energy capture process.

Our modules use very high-purity monocrystalline silicon cells (sc-Si), encapsulated through advanced lamination processes with high-transmissivity PVB (polyvinyl butyral).

• Generation Capacity: Each custom module offers a maximum nominal power output of up to 395 Wp.
• Estimated Energy Performance:
  Daily generation: 2.37 kWh, based on average irradiation.
  Monthly generation: 71 kWh.
  Annual generation: 865 kWh per unit.
• Module Efficiency: 17.10% efficiency, optimised to capture energy even in diffuse radiation, diffused light or cloudy conditions.
• Critical Components: IP67/IP68-protected junction box resistant to high temperatures, and symmetrical cables designed to minimise voltage drop losses.

Thermal Efficiency and Light Comfort

The glazing design seeks to balance energy generation with extreme thermal insulation, using double or triple glazing configurations with treated cavities.

• Thermal Transmittance (Ug Value): Through the use of cavities filled with 90% argon gas, we achieve thermal transmittance values of just 0.5 W/m².K in triple-glazing configurations, equivalent to the insulating capacity of a traditional opaque enclosure.
• Solar Control (g-Value): The photovoltaic cells act as an “active shade”. Combined with selective solar control coatings, they achieve a solar factor (g) of up to 0.26, blocking 74% of infrared thermal radiation.
• Light Transmission (LT): The system allows natural light transmission of up to 54%–65%, depending on the configuration, ensuring bright interior spaces without the risk of overheating.

Structural Engineering and Mechanical Safety

Photovoltaic retractable roofs are designed to withstand the most adverse weather conditions, ensuring the structural safety and durability of the mobile system.

• Load Resistance: Certified mechanical resistance to wind and snow loads of up to 11,430 Pa, approximately 1,166 kg/m², allowing installation in highly exposed areas.
• Glass Safety: Use of high-strength thermally toughened glass and laminated glass compliant with EN 12600, pendulum body impact resistance, and EN 356, manual attack resistance, class P2A.
• Durability: Service life of more than 30 years, with linear performance warranties ensuring 80% power output after 25 years of operation.

Sustainability and Decarbonisation

The implementation of these solutions directly contributes to achieving international environmental certifications such as LEED, BREEAM and Passivhaus.

• Emissions Reduction: Each photovoltaic retractable roof system avoids the emission of approximately 831 kg of CO₂ per year.
• Circular Economy: The main components, such as glass and aluminium, are recyclable, minimising the embodied carbon footprint across the product life cycle.

International Standards and Certifications

Our manufacturing and transformation processes follow the most rigorous standards:

• Management: ISO 9001 (Quality), ISO 14001 (Environment) and ISO 45001 (Health and Safety).
• Photovoltaics: UNE-EN IEC 61215 and 61730-1/2 (Design qualification and safety).
• Insulating Glass: EN 410 (Light properties) and EN 673 (Thermal properties).
• BIPV: IEC 63092-1 (Building-integrated photovoltaic modules).