Optimizing movable insulation configurations for semitransparent photovoltaic systems integrated with building's rooftop in cold climates

Abstract This study explores the performance of a building integrated semitransparent photovoltaic system enhanced with movable insulations, a thermal mass, and a south‐facing window focusing on its application in cold climatic conditions at a conceptual level. The system's electrical energy production, thermal gains, and daylight savings are assessed, with particular attention to the thermal conductivity, thickness, and configuration of movable insulations. A new daylight savings equation, integrating both roof and window contributions, showed a 72.66% improvement over previous approaches that neglected the contributions of the south‐facing window. Comparative simulations revealed that applying movable insulation only during off‐sunshine hours effectively prevents nighttime heat loss while avoiding daytime overheating. Additionally, optimizing the number of air changes from N = 1 to N = 5 reduced peak indoor temperatures from 40.88°C to 24.45°C, enhancing thermal comfort. The results confirm that decreasing U ‐values from 8.36 to 2.902 W/m 2 °C directly correlates with improved insulation performance, leading to greater energy efficiency and occupant comfort.