A field study of temperature efficiency, air change efficiency and ventilation efficiency in an office room with a displacement ventilation system has been made. The air change efficiency and the ventilation efficiency have been determined by using a tracer gas (N20) technique. Concentrations have been measured at four heights in the room and in the supply and exhaust air.
Using passive sampling techniques, including a passive sampling, multiple tracer gas technique (the PFT-technique), the Danish Building Research Institute has performed field measurements in about 130 dwellings. The dwellings comprised detached, naturally ventilated single family houses and single family houses and flats ventilated with exhaust ventilation systems.
Free Cooling is a mode of operation of a mechanical ventilation system to remove excess heat from office rooms during summer nights. A case study demonstrates, that free cooling can be quite effectiv and consumes a comparatively small amount of energy. Computer simulations give insight into the physical mechanisms and allow parametric variations.
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