For the case study, the four flats were equipped with a sophisticated sensor system and continuously monitored. A comparison of numerous measurement data on indoor air quality and energy consumption clearly shows the advantages of comfortable indoor ventilation.
Timber construction apartment blocks
The ventilation units were installed in the plant room in the basement, together with the Zehnder ComfoHeat 25 kW geothermal probe heat pump and the Zehnder hot water storage tank. The heat output in the flats is provided by underfloor heating. In summer, the underfloor system can also be used for cooling.
Odours and pollutants are also removed much more effectively than with manual window ventilation. Even if residents were disciplined in the way they ventilate through their windows, it would not be possible to achieve the same air quality as with comfortable indoor ventilation.
The measurements in the 4 flats provide a wealth of data on indoor air quality, outdoor conditions, and energy consumption for heating and cooling. To summarise, it can be concluded that professionally designed comfortable indoor ventilation makes a significant contribution to pollutant-free indoor air and a healthy indoor climate in living spaces. CO2 limit values are not exceeded or are significantly reduced when operating comfortable indoor ventilation.