- Client WMATA
- Location New Carrollton
- Size 384,250 sf
- Cost $234 M
As part of a task-order contract, Global Engineering Solutions (GES) is providing mechanical, electrical, plumbing and fire protection engineering services for the design of a new, 13-story, 384,250 sf office building consisting of 370,850 sf of office space, 3,500 sf of retail, a police station, clinic and fitness center.
During the pre-design phase, GES worked with the design team to identify opportunities for energy optimization. Using a “shoebox” energy model and a first-cost analysis, GES evaluated multiple HVAC systems including VAV air handling unit systems with air scrubbers, dedicated outdoor air systems (DOAS) with variable refrigerant flow (VRF) systems, and chilled DOAS terminal unit systems. A chilled DOAS terminal unit system met the needs of the office spaces on 2 – 11 but was not a good fit for first floor or the fitness area in the penthouse. Per WMATA Security requirements, the main entry lobby and main retail area will be served by an independent ventilation system. To maintain consistency on the floor, the police station will also be served by an independent ventilation system. All first floor HVAC systems will be cooled with low-temperature chilled water, and heated by hydronic hot water. The fitness area will be served by a single-zone variable air volume packaged unit with Dx cooling and gas-fired furnace heating.