Active Filtering and Exchange of Indoor Air by Means of Mobile Air Conditioners to Avoid Infection by The SARS Cov-2 Virus

In not actively ventilated rooms such as in schools, air exchange is insufficient, particularly during win- ter. Under the presence of COVID-19 or to reduce the CO₂ concentration, the air must be filtered and refreshed as well as possible. A tracer clearance experiment using a mobile air conditioner e.g. from KRONE Kälte + Klima VertriebsmbH Germany is supposed to determine to what extent. In Szabadi [1]. the air exchange rate [n] = 1/h is introduced as a measure of air exchange. The exhaust volume flow [dV/dt] ⩒ = m3/h is related to room volume [V] = m³. The air exchange rate n is a multiple of the room volume. Reference values are n = 3/h <= n <= 6/h. The air conditioner in (Figure 1) comprises an air recirculation (5) and an active air exchange (6). The recirculation may also filter and cool the air. Here, the air filter rate [f] = 1/h serves as a measure. Both measures must be considered according to [1].