Verizon, 95 William Street

ADIABATIC DRY COOLER DESIGN

• This project consisted of the replacement of three 500-ton cooling towers located on the roof of Verizon’s “G” building.
• The goal of the project was to replace old equipment that was past its useful life. The replacement we designed was a new adiabatic drycooler plant. This system had the benefits of reduced water costs, and elimination of legionella and chemical treatment issues prevalent in the old system.
• We evaluated the replacement of the existing towers with either new cooling towers in kind of adiabatic drycoolers. The use of adiabatic drycoolers provides the advantage of creating a closed loop condenser water system which significantly reduced the water consumption and maintenance costs of the plant.
• The biggest challenge with designing the adiabatic drycooler was the larger footprint and overall size of the equipment in comparison to traditional cooling towers.
• As the building was a critical facility, the project was phased in order to prevent any downtime. We designed a temporary air-cooled chiller plant that could operate during construction and support Verizon’s cooling needs while the cooling towers were replaced.
• The building has two separate chiller plants that needed to be supported from the single drycooler plant. Our solution was to design crossover piping and automatic controls solution at the rooftop level which allows Verizon to run either both chiller plants or only a single plant while still providing the required redundancy.