Design and performance investigation of a novel double-skin ventilated window integrated with air-purifying blind

Abstract

The blind is an effective device for controlling solar heat gain through the window. However, the usage of it exists the issues of overheating in summer and low heat gain in winter. Meanwhile, formaldehyde is a common indoor gaseous pollutant in buildings. Here, we proposed a novel double-skin ventilated window integrated with air-purifying blind, which could improve the overheating issue in summer and the solar thermal efficiency in winter while realize formaldehyde degradation at the same time. Then the system heat and mass transfer model was developed and verified, the impacts of various parameter on system performance were analyzed. Finally, the performance comparison of the double-skin ventilated window with air-purifying blind and shading blind applied in Hefei was performed. Main results were: (1) The model had the high accuracy in terms of thermal transfer, optical behavior and air purification. (2) The optimal slat angle and position of blind applied in winter and summer were 20° and 50o, 0.3 m and 0.7 m, respectively. (3) Compared with shading blind, the double-skin ventilated window with air-purifying blind could improve the thermal and visual comfort, and the saved thermal energy was 23.9 kWh/m2 in winter and 78.8 kWh/m2 in summer.