Final Report: Integrated Solution – Double Skin Facade and Diffuse Ceiling Ventilation for School Renovation (I-DIFFER)

The I-DIFFER project aimed to develop and demonstrate a novel, and easily implementable renovation solution that can enhance overall indoor environmental quality in buildings, specifically addressing improvements in air quality, thermal comfort, and acoustics. The project introduces the I-DIFFER solution, which integrates technologies such as the Double Skin Facade (DSF), Diffuse Ceiling Ventilation (DCV), and a ventilation control system. This solution employs a mechanical exhaust system, transporting fresh air through the DSF into the diffuse ceiling plenum and then into the occupied space to ensure satisfactory indoor conditions.
The I-DIFFER project evolved through simulation testing, establishing the fundamental concept of integrating the above-mentioned technologies. The energy performance and comfort were assessed across several scenarios, including variations in the outer layer of DSF, building orientation, etc. Subsequently, the I-DIFFER solution prototype was selected, and evaluated experimentally in a full-scale outdoor façade laboratory. This step was to verify the efficiency of the developed solution in ensuring a high environmental quality and avoiding the potential risks (draught and overheating). An optimized I-DIFFER solution was then implemented at the Ellehøjskolen classroom for demonstration. Performance assessment in the demonstration building revealed positive outcomes, including superior air quality, good thermal comfort and strong indications of energy efficiency of the solution.