Projected Benefits of New Residential Evaporative Cooling Systems: Progress Report #2

Research output: NRELTechnical Report


The use of conventional evaporative cooling has rapidly declined in the United States despite the fact that it has high potential for energy savings in dry climates. Evaporative systems are very competitive in terms of first cost and provide significant reductions in operating energy use, as well as peak-load reduction benefits. Significant market barriers still remain and can be addressedthrough improved systems integration. This report investigates the first of these approaches, exploring innovative components. The U.S. Department of Energy (DOE) Building America research teams are investigating the use of two promising new pieces of residential cooling equipment that employ evaporative cooling as a part of their system design. The OASys unit, which is a combination of directand indirect evaporative cooling stages developed by Davis Energy Group (DEG) and manufactured by Speakman CRS, is used to ultimately provide outside air to the living space. The outdoor air provided is indirectly and directly evaporatively cooled in two stages to a condition that can be below the wet-bulb (wb) temperature of the outside air, thus outperforming a conventional single-stage directevaporative cooler.
Original languageAmerican English
Number of pages62
StatePublished - 2006

NREL Publication Number

  • NREL/TP-550-39342


  • Building America
  • energy savings
  • evaporative cooling
  • peak-load reduction
  • residential buildings
  • residential cooling equipment
  • U.S. Department of Energy


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