Book - School of Science and Technology

Distribution for air-conditioning 423Supply airElement frameDiffuser core30°30°Range ofadjustmentFigure 15.21 Jet-type diffuserSupply ductPart section throughroof over poolDrum punkah louvre(adjustable)Figure 15.22 Punkah-type louvres in a swimming pool hallthat for which a fixed device is able to provide a satisfactory distribution within the space.Typical designs for these were illustrated in Figure 14.15.Floor outletsThe principle to be applied where floor distribution is to be used is `little and often'. Toavoid unacceptable air movement being experienced by the occupants, no more than arelatively small air quantity can be introduced at each outlet. There are effectively twotypes of floor outlet used in comfort application: the `twist' pattern and the straightpattern, both being circular and non-adjustable. These are shown in Figure 15.23 togetherwith the resulting air distribution patterns. The limiting air quantity handled by this type