Study on the Distribution Characteristics and Purification Effect of Formaldehyde in Decorated Indoors under Different Ventilation Methods

This paper analyzes the improvement of formaldehyde concentration in residential decoration after one month and ten months by testing, and uses simulation software to numerically simulate the distribution of formaldehyde in the closed, natural ventilation and mechanical ventilation conditions of the decorated house. The results indicate that, the concentration of formaldehyde is 0.10 mg/m³ after one month of decoration, 25% above standard;reduced to 0.08mg/m³ after ten months, reaching the standard. In closed conditions, the concentration of formaldehyde near the sofa and bed is the highest at 0.08mg/m³, while the concentration in the kitchen and bathroom is slightly lower, around 0.07mg/m³. Compared with closed conditions, the concentration of formaldehyde in the living room, master bedroom, secondary bedroom, and kitchen is reduced by 40%, 35%, 10%, and 25% respectively when the natural ventilation wind speed is 0.2m/s; reduced by 80%, 80%, 50%, and 70% respectively when the natural ventilation wind speed is 2m/s; reduced by 40%, 55%, 55%, and 25% respectively when the mechanical ventilation wind speed is 2m/s.