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This paper shows the feasibility of harvesting condensate from large dedicated outdoor air handling units and applying the condensate to effectively reduce the annual projected potable water consumption for a case study building. Condensate production potentials are calculated for three areas in Texas; San Antonio, Houston, and Dallas / Fort Worth. A case study building is presented, for which the production potential is applied. The case study building annual condensate production as well as the annual potable water consumption for the water closets and urinals and cooling tower makeup water is calculated and presented to compare condensate supply and potable water demand. The case study building, which is a medical research laboratory located in San Antonio, TX, was determined to have an annual condensate production of 1,887,031 gallons (7.15 x 106 L), which would normally be sent to the sanitary sewer system. The analysis indicates that the condensate production from the case study building’s large dedicated outdoor air handling units can completely supplement the annual water closet and urinal water demand with 1,614,031 gallons (6.12 x 106 L) of excess, which could be used to supplement landscape irrigation system or the entire condensate production could be applied to reduce the cooling tower makeup potable water demand by an estimated 16%.

 

Units: Dual

Citation: ASHRAE Transactions, vol. 115, pt. 2, Louisville 2009