Energy Management

VTT and Flakt Woods have developed an intelligent flow sensor for demand-controlled ventilation

VTT Technical Research Centre of Finland and Flakt Woods have developed a flow sensor which enables ventilation to adapt to actual demand, thereby improving indoor air quality and energy efficiency. The flow control utilises a flow sensor, based on ultrasound, which is ideal for use in challenging hospital conditions and schools, for example.

Existing ventilation systems are based on estimated average occupancy rates and cannot adapt to unexpected changes in them. For example, the air can be poor in a meeting room due to inadequate ventilation, if more than the expected number of occupants arrive; or the ventilation can be humming away in an empty room, wasting energy.

Under the ULVI joint project, funded by Tekes, VTT and Flakt Woods have developed a new flow sensor, which enables reliable measurement across the entire speed range, even at low flow rates. No dirt-gathering or bulky measuring devices are needed for the ventilation system. This maintenance-free, quiet, precise and intelligent sensor solution does not cause pressure drops.

“Our flow sensor is based on ultrasound technology. An ultrasound pulse is transmitted in the radial direction of the air channel and is measured differentially. This measurement system enables us to eliminate several sources of error and obtain highly accurate measurements,” says Anu Karkkainen of VTT, who is leading the research team.

“The new flow controller allows just the right volume of air to be pumped into a room, based on the current load. The overall lifecycle costs of a property fall when the ventilation works precisely and is demand- controlled,” says Product Manager Timo Kaasalainen of Flakt Woods. “Demand-controlled ventilation reduces energy costs by 45-50 percent,” he estimates.


The product will be launched on the Finnish and Swedish markets first, in September.

“The ULVI project is a good example of the cost-effective application of technology to a new area. VTT has been developing silicon-based MEMS (Micro Electro Mechanical System) sensors since the 90s and we now have a strong basis for meeting the measurement technology challenges faced by companies,” says Karkkainen.

Tel: +358 40 820 5883 WWW.VTT.FI

Introducing the Heatrec 1003 single room heat recovery unit from Vectaire

Vectaire’s Heatrec 1003 single room heat recovery unit is for both new-build and refurbishment.

It provides low level and continuous, energy saving ventilation combined with high performance and efficiency.

It saves up to 75% of potential heat loss and includes an integral summer mode and a frost-start.

The Heatrec 1003 is available with 400, 500 or 600mm length tube heat recovery cells (100mm dia),


Tel: 01494 522333 32

and a terminal kit incorporating both a weather louvre and a condensate outlet.

It is available in standard, timer, and humidity control.

This product, together with other models in Vectaire’s range of energy saving ventilation units, are detailed in the latest Social Housing Catalogue (downloadable from socialhousing)


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