Building Statistics Part II
The delivery method used for the New Science Center is Construction Manager At-Risk with a fixed fee and Guaranteed Maximum Price contract. The construction manager is Whiting-Turner Contracting Company. Construction broke ground in May 2010 and is scheduled to be turned over to Georgetown University by July 2011 for move-in. The combined contract amount is approximately $69.5M excluding owner soft costs for Furniture, Fixtures, and Equipment. Special requirements for LEED certification must be met throughout construction. Some of these include a waste management plan to recycle and salvage waste materials, an Erosion & Sediment Control Plan to limit erosion and sedimentation, and recycled content requirements of building materials.
The structure of the New Science Center consists of caissons, grade beams, some concrete foundation walls and structural steel framing. The grade beams are tied into the concrete caissons that extend down as far as 120 feet below grade. 3 to 5 ½ foot diameter caissons are to be embedded a minimum of 4 feet into weathered rock strata. The structural steel framing consists of a large range of wide-flange beams and columns, and uses brace framing at several locations to support lateral loads. The floor system is a 6 ¼” total depth, reinforced LW concrete slab on composite deck.
Four 50,000cfm air handling units (AHUs), located in the penthouse on top of the building, supply 100% outdoor air throughout the building. The AHUs utilize enthalpy wheels to recover heat from exhaust air during appropriate conditions. VAV boxes adjust airflow to each space based on occupancy and load requirements. An active chilled beam system provides heating and cooling for most of the spaces in the building. Steam and chilled water provided by district plants of the university are used for the heating and cooling systems. High pressure steam enters the building and is converted into low pressure steam and medium pressure steam at one of six pressure reducing valve stations. Low pressure steam is used for preheating and humidification at the AHUs, and heating water to the chilled beams. Medium pressure steam is supplied to each floor for glass cleaning stations near the labs. Condensate is returned to the district plant using two condensate pumps. The chilled water is distributed directly to the chilled beams and the cooling coils in the AHUs. The HVAC components are monitored and adjusted by the Building Automation System to optimize energy performance.
Power will tie-in to the existing 15 kV utility distribution in the basement of the Leavey Parking Garage adjacent to the New Science Center. The entering utility power is reduced to 480/277V by two 2000kVA transformers in the main Electrical Room in the first level. Power is then distributed through the building through two 4000A switchgears in the main Electrical Room. Each floor has a separate electrical room containing a 480/277V and a 208/120V distribution panel board. Emergency power is provided by an 800kW diesel powered generator and is supported by two 5 minute UPS’s.
A wide variety of lighting fixtures is used throughout the New Science Center. Fluorescent fixtures are used in nearly all spaces. LEDs can be found in lab spaces, high pressure sodium in the loading dock area, and metal halides around exterior stairs in the terrace area. All ballasts are electronic, including many with dimming capabilities in offices, classrooms, and labs.
The building’s sprinkler system is supplied by a 75hp 1000gmp fire pump and is to be installed in accordance with NFPA 13 and NFPA 14. Manual pull stations, smoke detectors, and heat detectors are used throughout the building.
A long, monumental stairway travels from levels one through four, across the glass curtain wall on the west side of the building. There are two adjacent elevators also included in the building’s design. The smaller of the two travels from level one through five, and the large extends from level one to the penthouse. Two sets of emergency stairs on opposite ends of the building are accessible to all levels.
Lab Support Systems
The laboratories require special systems to support various experiments and activities. Some of these include a compressed air system, a liquid nitrogen storage and distribution system, a water purification and distribution system, a vacuum system, and a natural gas distribution system.