This paper presents information on the principles and application of displacement ventilation and discusses the most significant design parameters. Included are details of the performance characteristics of low velocity air terminal devices and of the resulting indoor environment based on experimental studies. Strategies for the design of displacement ventilation systems are also presented.
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.
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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