Churchill Downs Gets an IAQ Grooming
The race, which is staged annually in Louisville, caps the two-week-long Kentucky Derby Festival. Outstanding comfort, especially IAQ, was a prime consideration for the historic landmark’s owners.
$121 MILLION RENOVATIONChurchill Downs began its monumental expansion and renovation project in 2002, under the direction of architects and engineers from the Louisville firm of Luckett & Farley. The renovation lasted almost five years.
The project included new grandstands, Millionaires Row and Jockey Club suites, a new clubhouse, and a renovation to the original twin spires. The renovation has added three new stories to the main spectator facility, taking the present structure to a height of more than six stories. The project was completed in two phases.
Three main objectives impacted the HVAC design criteria for the sales team from Harshaw Trane in Louisville:
IAQ AND HVACAccording to John Dorn, Trane sales engineer, “The system was designed to meet the specific needs of the new Churchill Downs facility. They had a clear understanding of what they wanted and that allowed us to tailor the equipment to meet their objectives.”
For Phase 1, engineers chose a low-temperature, low-flow, variable-primary-flow (VPF) system capable of supplying 38°F water with two 1,000-ton chillers. The system included one Systecon water-source heat pump package and a large number of Trane air-handling units, some inside and some outdoors where they could be hidden from view. Several of the air-handling units were fitted with Dynamic V-Bank air cleaners for filtration and odor control.
The VPF design eliminates the need for constant-flow chiller pumps and uses variable-flow chilled-water pumps to circulate water through the chilled-water loop. The design adds a modulating bypass valve in the bypass line to deliver the amount of water necessary to maintain the minimum evaporator-flow limit of each operating chiller. By contrast, the bypass line in a primary-secondary system helps ensure constant chiller flow at all times.
Like the secondary pump in a primary-secondary system, the pumps in a typical VPF system operate to maintain a target differential pressure, the designers said. As the plant controller stages the chillers on and off to match cooling capacity with system load, the difference between the return-water and supply-water temperatures remains nearly constant.
A 400-ton packaged, air-cooled chiller was used to condition the facility until the completion of the main central chilled/hot-water plant during Phase 2.
Phase 2 included Millionaires Row, the clubhouse, and anything else that had yet to reach the finish line. The permanent, 2,000-ton central plant and two Tower Tech Inc. cooling towers were installed during this phase.
Two built-up, 175,000-cfm air-handling units serving the majority of Phase 2 wagering facility were fitted with two and one-half stories of V-Bank air cleaners for filtration. The IAQ products use electronic polarized media to remove up to 97 percent of particles down to 0.3 microns in size; they also are effective at capturing odors and gas-phase contaminants, the manufacturer said.
The entire system is controlled by a Trane Tracer Summit building automation system, which maintains the desired indoor comfort conditions, as well as controlling energy consumption on a consistent basis. This single, integrated system is accessible over a Churchill Downs internal network.
Publication date: 04/23/2007