Noise testing of ventilation systems in teaching rooms on a laboratory scale

The article presents the measurement results of reverberation time, acoustic background and noise level of the tested ventilation installations in a teaching room. The research was carried out as part of the "Ventilation for schools and homes" project financed by NCBiR. The aim of the research project is to develop innovative ventilation systems dedicated to individual classrooms and apartments. The used solutions are intended to improve low air quality in schools and multi-family buildings while reducing the demand for energy necessary to heat them. For the purposes of the research, an actual-sized model room with various development options was built. The applied ventilation systems are to meet, in accordance with the imposed project guidelines, the requirements for an equivalent sound level not exceeding 40 dB. The conducted research allowed for a preliminary assessment of the acoustic quality of the room. The introduced solutions to increase the acoustic absorption of the interior allowed to obtain background acoustic levels of 20.8 dB. For the tested types of the operating ventilation, the equivalent sound level was 32.2 dB, 37 dB and 29.7 dB, respectively.