Located in the heart of Arlington’s Ballston neighborhood, the 183-suite Residence Inn at Liberty Center earned a certification level of Gold under the LEED for New Construction & Major Renovations™ rating system. The design team’s approach to achieving a cost-effective high performance design focused on balancing system selections with budget goals.
GHT designed multiple energy models to inform design and equipment choices, providing data such as hourly usage simulations and anticipated guest versus staff consumption. One of the selected energy-saving features was a Onity/Senercomm system in the guest rooms, which interfaces with remote passive infrared motion detectors, HVAC unit thermostats, and door switches. The Onity system turns off the HVAC unit when the room is empty and restores operation the moment a guest opens the entry door. This strategy helped deliver a building that is 27.5% more efficient than the comparable baseline under LEED version 2.2. The building design also achieved a 20% reduction in potable water use.
A central plant located in the penthouse level provides cooling, heating, and domestic hot water. The cooling plant consists of two low profile cooling towers which generate closed loop condenser water via open loop tower water through plate-frame heat exchangers. The heating plant consists of three boilers that maintain a year-round hot water loop temperature of 150° (adj.), which provides hot water for closed loop condenser water and heating for the indoor pool via a heat exchanger. The domestic hot water is generated via four water heaters – two for kitchen/laundry and two for guest rooms/public areas. Submeters were installed on domestic water and condenser water distribution piping to the retail tenant space.