Evaluating UV-Protective Low-Emissivity Window Films: Implications for Thermal and Visual Comfort in Luminous Office Buildings

This review article explores the integration of thin window films and solar energy systems to enhance thermal comfort in luminous office buildings. Luminous office buildings, which prioritize natural lighting, often face challenges in maintaining thermal comfort for occupants. By integrating solar energy systems, such as photovoltaic (PV) and solar thermal systems, with thin window films, it is possible to optimize thermal comfort while harnessing sustainable energy sources. Thin window films act as a barrier against solar radiation, reducing heat gain while allowing therapeutic blue light (400-520nm) transmission. The advantages of thin window films include improved thermal insulation, glare reduction, and harmful ultraviolet (UV) band protection. Case studies reveal that the integration of low emissivity (Low-E) films resulted in up to a 30% reduction in energy consumption for heating and cooling, while also enhancing indoor thermal comfort. Solar energy systems contributed to a 20% increase in energy efficiency by supplementing the building’s energy needs. Furthermore, Low-E films support the public health and CO2 emission reduction by cutting down the energy requirement of the buildings leading to lower greenhouse gas emission, better air quality, and more comfortable indoor environments. Through these influences, such thin films provide the efforts for improving environmental health and foster sustainable urban living.