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The Green Building Sector Is Ripe for Water-Saving Innovation, Report Says

"Cooling Tower Water Recovery: Cooling towers for chillers are often the largest consumers of water in commercial buildings. (They typically rely on water evaporation to provide cooling for air conditioning.) A large commercial building with 1,000 tons of refrigeration will use 3,000 gallons of water per minutes, the report says.

Newer cooling technologies like variable refrigeration volume systems, which cool individual rooms of a building depending on the need, show promise for reducing water (and energy) use, as do cooling tower water management techniques, such as automated controls. Water treatment technologies (such as Dolphin WaterCare’s system) increase the recirculation rates in cooling towers before the need for a so-called blowdown, when water is removed from the system to reduce mineral concentration and scaling that occurs as a result of the evaporation process.

There is a “potential opportunity” for whole building water savings, according to the report, in the reuse of wastewater (blowdown and condensate) from cooling towers and other mechanical equipment for irrigation. But condensate recovery has not yet caught on all that well in the building industry."

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