Beneficial Use of Air Handling Unit Condensate for Laboratory HVAC Energy and Water Recovery in Hot and Humid Climates

Greg Eades, U.S. Environmental Protection Agency

Although there has been much research into reduced potable water consumption derived from air handling unit (AHU) condensate for sites situated in hot and humid climates, relatively few studies have explored its energy recovery potential. In hot and humid climates, AHU condensate can be leveraged as a source for pre-cooling and cooling tower make-up water.

This presentation describes the methodology used to analyze and predict AHU condensate's energy and water recovery potential by presenting a case study for a 100% outside air laboratory building sited in Raleigh, North Carolina. Results indicate 10% energy and 28% water savings utilizing this approach.

Learning Objectives

  • Learn how to employ a simplified model to predict energy and water savings by employing air handling unit condensate for laboratories located in hot and humid climates.
  • Appreciate the pronounced affect that make-up water chemistry has on laboratory cooling tower operations.
  • Realize the benefit of using air handling unit condensate to pre-cool the exhaust air stream for laboratory run-around energy recovery loop systems.
  • See how blending laboratory air handling unit condensate with other cooling tower make-up water sources decreases the amount of required potable water and increases the frequency between blow down events.


Greg Eades currently serves as the Facility Operations Branch Chief for the U.S. Environmental Protection Agency's Research Triangle Park, N.C. Campus. He has also held a variety of engineering positions for the State of North Carolina, the private sector and the U.S. Air Force. Mr. Eades is a North Carolina registered Professional Engineer and a Certified Energy Manager.


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