The solar building façade system in the study uses special modules to generate hot water and electricity. These modules help reduce heat entering the building and can warm up fresh air. By analyzing heat transfer theoretically and through experiments, the researchers found that the system's performance is good, with a coefficient of 3.1 and a 9% efficiency in converting sunlight to electricity. The special façade can cut heat flow through the walls by 40%, making it more efficient than traditional walls.