A multi-stage down-draft evaporative cool tower for semi-enclosed spaces. Part II: Water spraying system Academic Article uri icon


  • In a conventional down-draft evaporative cool tower (DECT), dry ambient air is drawn in at the top and cooler moist air is delivered at the bottom. Most of the cooling occurs near the inlet, where water is introduced and air temperature approaches the wet bulb. A novel DECT was developed which incorporates a secondary air inlet and complex longitudinal section that comprises two partly overlapping cones. The complex section and the addition of a secondary air intake near the middle required a sophisticated water spraying system. In addition to maximizing the cooling potential, the spraying system was designed to limit spray drift beyond the base of the tower, to reduce maintenance costs (especially due to clogging of the sprayers) and to minimize pumping energy. Analysis shows that maximum cooling may be obtained either by employing a very fine spray, requiring the introduction of a …

publication date

  • January 1, 2006