GSA Guidance - Alternative Water Treatment Systems for Cooling Towers

Jesse Dean, Gregg Tomberlin, Andrea Silvestri

Research output: NRELTechnical Report


Between 2014 and 2017, GSA's average water rates nationwide increased 41%. Rapidly escalating costs, mandated water-reduction targets, and the fact that on average, 28% of commercial office-building water use is associated with heating and cooling led the GSA Proving Ground (GPG) to select six alternative water treatment (AWT) technologies for in-field validation. AWT technologies claim significant reductions in the amount of water consumed by chilled water plant cooling towers, which provide cooling for 80% of GSA floor space. This report summarizes the first four evaluations, which were evaluated by the National Renewable Energy Laboratory (NREL).
Original languageAmerican English
Number of pages24
StatePublished - 2020

NREL Publication Number

  • NREL/TP-7A40-73940


  • AWT
  • cooling towers
  • GPG
  • GSA


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