Flow Field Measurements in a Large Controlled Ventilated Room

A large-scale test room, which represents a Test Control Room facilities in scale 1:1, has been recently developed in order to evaluate the internal flow filed induced by the ventilation system. Due to its crucial relevance in numerous technical applications, rooms ventilation efficiency has been subject of several scientific investigations considering also the restricted requirements that such devices should satisfy in terms of microbiology, particulate concentration and pathogen diffusion (Covid-19). Such a large-scale test room with an internal dimension of 6x6x3 m (corresponding to an internal volume of 108 m3) has been equipped with four inlets and twelve exhaust terminal grids, parts of the ventilation system entirely customary designed. In order to assess effects of different air flow rates, induced by the ventilation system, on the internal flow distribution, a relevant number of three dimensional velocity measurements has been performed, under isothermal conditions, by using a fiber optic Laser Doppler Velocimetry. Consistently with the survived literature, two different inlet flow rates have been considered, in particular 15 and 30 Air Change per Hour (ACH) respectively corresponding to 0.45 and 0.90 m3/s. The whole campaign of measurements has been performed totally in 690 points for a total of 4140 single velocity components acquired.