Under-floor air supply allows for a reduction in tonnage due to higher supply air temperature and lower supply air volume versus a standard overhead mixed-air system,” said Calahan. “The system brings in 100% outside air though plate-type heat exchangers before being conditioned to a supply temperature of 63☏ (17.2☌). “Circa is the first casino in Las Vegas to use variable volume, under-floor air supply to serve the gaming floor. The most substantial energy efficiency challenge Circa faced was the high ventilation requirements for casino gaming floors, said Calahan, adding that exhaust air energy recovery and variable speed demand control ventilation are the most effective ways to mitigate these challenges. The Circa Resort & Casino, located on Fremont Street, opened in October 2020 and is an adults-only property offering more than 1.2 million ft 2 that includes 777 guest rooms, two levels of casino gaming floor, meeting rooms, restaurants and the world’s largest sportsbook. Managing owner expectations and agreeing on reasonable design conditions is often one of the first steps in the design process,” said Ryan Calahan, P.E., Member ASHRAE, who is the vice president of the ASHRAE Southern Nevada Chapter and was part of the design team that created the first new ground-up casino in downtown Las Vegas in more than 40 years. It’s hard to keep a casino 65☏ (18.3☌) when it’s 110☏ (43.3☌) outside and the owner wants the whole side of the building open to Fremont Street. “Las Vegas is a particularly challenging location when it comes to energy efficiency. Often the guest experience can come at the expense of energy efficiency. LAS VEGAS-The city that never sleeps makes energy efficiency an even greater challenge-especially in the city’s hotels and casinos. Exploring the Design Challenges Behind Las Vegas’ New Circa Casino

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