VTT Technical Research Centre of Finland and Lifa Air Oy Ltd have jointly developed a room filter that traps particles, toxic gases, bacteria and viruses in the incoming air. Low-priced and energy-efficient, the filter can be fitted in the existing air-conditioning systems. Room-specific filtering of inlet air has been attracting increasing international attention in the face of the possibility of a terrorist strike with chemical warfare agents introduced into the HVAC (Heating, Ventilating, and Air-Conditioning) system.
Developed with VTT’s expert assistance, the new filter is revolutionary because it can trap not only hazardous particles like natural disease carriers but also gaseous impurities. The filter has been tested in co-operation with the Finnish Defence Forces, and the world’s first “Lifa 3G” SARS filter was installed on an ambulance at the Helsinki University Central Hospital.
The idea with the new filter is that the impurities contained in fresh air introduced into a space are given an electric charge and then trapped on the filtering surfaces and activated carbon. Once trapped, bacteria and viruses are killed by ultraviolet light. The Hong Kong University of Technology was also involved in the project that was funded partly by the National Technology Agency of Finland (Tekes).
Ilpo Kulmala | alfa
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The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.
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