Abstract: When vehicles enter and exit the tunnel, awning can effectively reduce the "black hole" and "white hole" effect, and save electric energy. The photovoltaic thin film material has the function of photovoltaic power generation and has a certain transmittance, which can be well combined with the awning to achieve the double effects of reducing hole light and photovoltaic power generation. According to the characteristics of the transmittance of photovoltaic thin film materials and the demand of photovoltaic power generation scale, the visual illuminance adaptation curves are compared by DIALUX numerical simulation method, and the combined working conditions of different transmittance and different lengths of light transmittance of photovoltaic film awning under different seasons and driving speeds are discussed. The research results show that: (1) When the driving speed are 120, 80 and 40 km/ h, the best combination of light transmittance are 0.3 at the initial stage and 0. 15 at final stage, 0.2 at the initial stage and 0.1 at the final stage, and 0.15 at the initial stage and 0.05 at the final stage, respectively; and the corresponding optimal lengths of awning are 100, 80 and 60 m, respectively. (2) The photovoltaic film awning has a good effect on reducing the light at the tunnel entrance/ exit.

Key words: highway tunnel, photovoltaic film, awning, radiation, transmittance, vehicle speed, awning length