A Study on the Thermal Performance of Hollow Glass Windows With Reflective Aluminum Louvers

This study evaluates the energy‐saving potential of hollow glass windows integrated with reflective aluminum foil louvers, tailored for hot‐summer, cold‐winter regions. The reflective integration minimizes solar absorption and bolsters insulation. Experimental results indicate a 14.9% reduction in heat transfer coefficient ( K ) (from 2.427 to 2.066 W/[m 2 ·K]) and a 20% decrease in shading coefficient (SC) (from 0.30 to 0.24) compared to standard louvers in the closed position. Furthermore, a coupled effect between air layer thickness ( δ ) and louver angle ( θ ) on K is observed, with smaller δ intensifying θ ’s influence. The reflective system demonstrates superior thermal performance at a modest cost increase of 3.4%, rendering it viable for energy‐efficient applications.