Engineering application related issues of air cleaners—Discussion on several problems about air cleaners (4)

Discusses the issues of the air pollution that air cleaners can bear and the indoor concentration level that can be achieved, which are generally concerned with the use of air cleaners in rooms, and gives a simple calculation method. Considers that the normal indoor dust is much smaller than the infiltrated dust from the gaps, which can be ignored in calculation. When outdoor air ratio ranges from 0.1 to 0.3, the air cleaner with outdoor air supply can resist the invasion from gaps, which reduces the indoor particle concentration. Comparing with improving the filter efficiency or the equivalent air change rate of the air cleaner without outdoor air, the air cleaner with outdoor air can effectively control indoor pollution. When the weight efficiency is equal to 0.95, the equivalent air change rate should not be less than 6 h-1 and reach 8 h-1, and the time required for the indoor concentration reaching 1/6 of the initial concentration is close to 1 h.