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/[m2·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.
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