USA
Challenge
A unique system known as the Centralized Renewable Energy System (CRES) was designed by Olsson Associates to provide significant amounts of energy to NIC in an innovative, efficient and renewable manner and eventually handle the heating and cooling needs of 1.8 million square feet. The remainder of NIC will be heated and cooled using traditional methods. CRES uses the heat from the City of Lincoln’s Theresa Street Wastewater Treatment Facility (WWTF), which is conveniently located next to NIC.
Solution
The heat exchange facility pumps — purchased from Electric Pump, a Xylem distributor — are Flygt CP 3306, 110-horsepower submersibles with a design point of 4,947 gallons per minute (GPM) at 62.4-foot total dynamic head. There are currently three pumps installed; the project was designed for expandability so three more pumps can be added when necessary.
