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Casino Bets on Rooftop Air Handlers, Centrifugal Chillers for Energy Savings

October 10, 2014 By Karen Henry

slots-energy-manageHollywood Casino in Toledo, Ohio, was built with energy savings in mind. To help the two-story 344,000-square-foot building achieve LEED certification, the building owner and design team brought in Daikin Applied to install rooftop air handlers and centrifugal chillers. An article in HPAC Engineering describes the construction project.

Daikin installed 21 RoofPak variable-air-volume (VAV) air handlers with total-energy-recovery wheels and three Daikin single-compressor centrifugal chillers.

The rotating energy-recovery wheels draw outside air across half of the wheel and exhaust air across the other half. By transferring energy between the ventilation and exhaust air, heat can be recovered during the winter, and cooling is free during the summer.

The water-cooled chillers are located in a separate steel enclosed packaged chiller plant, and cooling towers are located adjacent to the plant. The cooling equipment alone is responsible for 18.4 percent of the facility’s overall energy savings, according to an energy analysis completed by Concord Atlantic Engineers (CAE), which supplied mechanical engineering design for the casino.

The primary HVAC systems use a four-pipe system with the RoofPak units, and 276 VAV boxes within the building’s ductwork control individual thermostat-controlled zones within the building.

The casino contains a total of four boilers housed in two boiler rooms. One boiler room is located on each level.

The air handlers, chillers, cooling towers and pumps were integrated with a Johnson Controls Metasys building-automation system (BAS) using the BACnet open standard protocol. The Daikin equipment features Open Choices controls, which are compliant with all standard BAS communication protocols.

CAE’s energy analysis calculated a 13.02 percent savings in electricity and gas consumption above the ANSI/ASHRAE/IES Standard 90.1-2007, Energy Standard for Buildings Except Low-Rise Residential Buildings, baseline for the entire facility, according to the HPAC Engineering article.

Other energy-saving elements included lighting, domestic water heaters, boilers, insulation and construction materials, the article said.

As a result of energy efficient equipment purchases, the building owner is expected to receive more than $100,000 in rebates from the local utility company.

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