Removal of formaldehyde in urban office building by the integration of ventilation and photocatalyst-coated window. (April 2020) - Zhang, Tianhu
Highlights: Both of ventilation and photocatalysis were involved in the removal of indoor HCHO. The CFD method was used to study the ventilation and photocatalysis in an office. The continuous and transient released HCHO were considered. Abstract: Indoor formaldehyde (HCHO) has become a big problem for the development of health building in cities. Ventilation and photocatalysis are two efficient tools to remove HCHO. The comparison and integration of the two methods was conducted. Pure titanium dioxide (TiO2 ) and Fe/N-TiO2 were prepared and coated to a glass plate, and experimental and computational fluid dynamics (CFD) method was used to analyze photocatalysis of HCHO. The reaction kinetic of HCHO degradation was studied by experiment, and the efficiency of Fe/N co-doped TiO2 exhibited 2.3 times than that of pure TiO2 . Then the CFD method was used to study the removal of HCHO by ventilation and photocatalysis in an office. The evaluations were conducted with continuous and transient released HCHO, separately. In the case of continuous release, the average concentration of HCHO was reduced by 27 % with the contribution of photocatalyst. In the case of transient release, the removal efficiency was improved by 21 % when the photocatalyst was added. This research shows that the CFD method is a convenient tool to explore the effect of novel materials in indoor environment.