The experimental and numerical analysis of semitransparent double-skin ventilated window for heating, shading and air purification based on a flexible thermal catalysis film

A novel semitransparent thermal-catalytic glass (TC-glass) for heating, daylighting and air purification was proposed, which was applied to double-skin window (TC-glass window). Firstly, a novel flexible TC film was designed, the purification performance and kinetic model were investigated. Secondly, the experimental system of TC-glass window was built and the thermal performance and purification performance were investigated by all-day experiment. Thirdly, the heat and mass transfer model of TC-glass window was established and verified. Main results were: (1) The adding of polyvinyl alcohol in TC materials increased 10.07 kJ/mol activation energy. (2) The daylighting and formaldehyde removal analysis on TC-glass showed that the catalyst coverage ratio of 60 % was recommended as the optimal ratio. (3) The experimental average thermal, formaldehyde once-through conversion and daily total clean air volume of TC-glass window glass were 40.8 %, 31.1 % and 238.18 m³, respectively. (4) Throughout the year, with 40 %, 60 % and 80 % catalyst coverage ratios, the heat gain from channel air over heating season were 213.47, 261.62, and 284.22 MJ/m², respectively, the total clean air were 11952, 16672, and 19851 m³/m², respectively, the heat carried away by the channel air over summer were 274.53, 287.2 and 297.44 MJ/m², respectively.