VTT and Fläkt Woods control the airflow
VTT Technical Research Centre of Finland and Fläkt Woods have developed an intelligent flow sensor that automatically controls ventilation according to demand.
The flow sensor is based on ultrasound instead of estimated average occupancy rates as most existing ventilation systems utilise.
“An ultrasound pulse is transmitted in the radial direction of the air channel and is measured differentially,” explains Anu Kärkkäinen from VTT. “This measurement system enables us to eliminate several sources of error and obtain highly accurate measurements.”
Using a contemporary ventilation system in an overcrowded meeting room for example, would inevitably lead to poorer air quality as it cannot adapt to the unexpected number of people in the room.
“The new flow controller allows just the right volume of air to be pumped into a room, based on the current load,” says product manager Timo Kaasalainen from Fläkt Woods. “The overall lifecycle costs of a property fall when the ventilation works precisely and is demand-controlled.”
“Demand-controlled ventilation reduces energy costs by 45–50 per cent,” Kaasalainen estimates.
VTT and Flow Woods developed the flow sensor under the Tekes-funded ULVI joint project, and will launch the product first on the Finnish and Swedish markets in September.