Monk Spaces evaluated a mixed-use building in Raipur in collaboration with Ant Studio. This study focused on quantifying the benefits of implementing a double-skin facade system. The performance evaluation encompassed several key metrics, including the capital cost of the HVAC system (Heating, ventilation, and air conditioning), building Energy Performance Index (EPI), carbon payback, economic payback, and the required air conditioning hours. The aim was to determine the comprehensive impact of the double-skin facade on its performance in terms of economic and environmental costs.

The study considered variations in the façade’s design to evaluate multiple options. These variations were defined in terms of some parameters. These parameters included the following:

• Distance between the primary facade and the double-skin
• Possibility of opening windows in the facade
• Provision of water flow
• Temperature of the water flow

These parameters were varied to understand how they could optimize the building’s energy performance and cost efficiency. Adjusting the distance between the facade and double skin was seen to impact insulation and airflow, while window openings affect natural ventilation. Water flow provisions enable passive cooling or heating, and controlling water temperature influences thermal comfort.

The isolated benefit study highlighted the double skin facade’s potential for operational cost savings and capital cost reductions. It also led to an understanding of incremental embodied carbon due to constructing the façade for operational carbon savings. By carefully considering the impact of the variable parameters on performance, the study provides a comprehensive understanding of how to optimize the design and implementation of double-skin facades for enhanced building performance and sustainability.