Lots of schoolchildren, confined spaces, whether working concentrated or over tables and benches during breaks – an insufficiently ventilated classroom is ideal for the spread of infectious diseases such as COVID-19.
The desire for fresh air in the classroom did not just arise in the wake of the pandemic. The air quality in schools has long been discussed. This is mainly due to the high CO2 concentration in the room air. This leads to headaches, concentration problems and symptoms of fatigue over several lessons. The windows would have to be opened much more frequently.
For various reasons, the need for fresh air in the classroom is not being met. With the window ventilation, dust, pollen and noises come to the inside. It also becomes critical in the cold season. Regular ventilation causes cold drafts to flow into the classroom, the rooms cool down, students and teachers freeze and are therefore more susceptible to supposedly more harmless pathogens.
In this case, the iV-Office is designed with 25 m³/h per device, resulting in an outside air volume flow of 100 m³/h with 4 devices in the room (two device pairs).
This corresponds to 5 m³/h per person with a group of 20 people.
In general, classrooms can be designed in accordance with DIN EN 15251: 2012 and DIN EN 16798-3. An average CO2 concentration of 1000 ppm should be maintained. Depending on which classification is agreed, outside air volume flows between 20 and 36 m³/h per person are required. One way of achieving the required outside air volume flows is to combine mechanical ventilation with heat recovery and window ventilation. By using efficient ventilation systems, the ventilation can be taken over completely or the number of window openings can be reduced to a minimum.
The iV-Office achieves continuous basic ventilation within the specified sound emission requirements (here: 35 dB(A)). The basic ventilation slows down the increase in the CO2 concentration, and the air exchange can be temporarily increased to up to 180 m³/h before and after use. In addition to the removal of CO2, the mechanical ventilation also prevents infections. Existing aerosols are transported outside via the devices and the fresh air supplied lowers the concentration of the aerosols in the room air. In order to achieve the required air exchange in this application, ventilation should be achieved by opening the windows temporarily, e.g. be supported during the breaks.