We verified that the electronic air cleaner installed in the whole-building air-conditioning system removes aerosols containing viruses and bacteria for the prevention of airborne infection. As a result, we consider the electronic air cleaner to be effective against viruses and bacteria due to its ability to collect dust at the particle size of a virus. In addition, we confirmed that living spaces where the system is installed do not become “poorly ventilated closed spaces” due to the system’s heat-exchange type of ventilation.
2. Miniaturization of humidity element leads to advances in sensor unit technology
Tatsufumi Yano, Masahiro Sugiyama
Duct temperature-humidity sensors require regular maintenance in order to maintain performance. To reduce the required man-hours, we developed a new compact humidity element （FP5™） and made it into a sensor unit to replace our existing one. Additionally, in order to compensate for the decreased S/N ratio resulting from miniaturization of the humidity element, we digitized the measurement signal processing, allowing us to develop a temperature-humidity sensor that solves problems in design and production control.
