Radiation control optimization for dynamic glazing in building façades in subtropical climate

Glazing facade in commercial buildings contributes to significant thermal loads for HVAC. Smart window proposes efficient solar control, but it demands insulated glass units (IGU), which could not be appropriate for warm climates. Simulations were carried out for a small office room in Sao Paulo/Brazil with laminated, IGU, and electrochromic (EC) glazing. Results showed almost no difference in consumption between laminated and IGU in cooling energy and a 5% decrease for EC glazing. Performance increases with building infiltration; when coupled with hybrid ventilation, energy consumption reduces 64.7%. EC window is suitable for the warm climate since combined with proper ventilation design.