Hybrid Cooling for Geothermal Power Plants: Final ARRA Project Report

Research output: NRELTechnical Report


Many binary-cycle geothermal plants use air as the heat rejection medium. Usually this is accomplished by using an air-cooled condenser (ACC) system to condense the vapor of the working fluid in the cycle. Many air-cooled plants suffer a loss of production capacity of up to 50% during times of high ambient temperatures. Use of limited amounts of water to supplement the performance of ACCs isinvestigated. Deluge cooling is found to be one of the least-cost options. Limiting the use of water in such an application to less than one thousand operating hours per year can boost plant output during critical high-demand periods while minimizing water use in binary-cycle geothermal power plants.
Original languageAmerican English
Number of pages32
StatePublished - 2013

NREL Publication Number

  • NREL/TP-5500-58024


  • air cooled condensers
  • binary-cycle
  • finned-tube
  • heat transfer
  • Nevada
  • Ormat Technologies, Inc.
  • power plant cooling


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