STRUCTURAL OPTION
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Mechanical Systems:
GUEST SUITE FLOORS/CORRIDORS
The Residence Inn by Marriott must accommodate the individualized heating and cooling needs of its guests. Both heating and cooling is achieved by an all-refrigerant mechanical system. Each of the guest room floors (floors 2-9) has three zones, each of which is supplied refrigerant from a variable refrigerant volume (VRV), variable-speed air-cooled condenser on the roof. These condensers each have a cooling and heating capacity of 96,000 BTU/h and 108,000 BTU/h respectively. Individual guest suites house vertical air handling units (either 400 cfm or 600 cfm, depending on the size of the suite) that then distribute conditioned air to the individual spaces within each suite.
Two rooftop direct expansion (DX) cooling and two-stage gas heat units, located on the roof at either end of the building supply the necessary outdoor air to each guest suite, as well as conditioned air to the corridors. The main tree runs vertically through a mechanical shaft, and branches out to the corridors on each floor. These units are fueled by natural gas and feature backward-inclined plenum blowers for energy efficient delivery of approximately 5,000 cfm of airflow.
GROUND FLOOR
The majority of the first floor and the elevator lobbies on each floor are conditioned by a 35-ton rooftop air conditioning unit located centrally on the roof. Variable air volume (VAV) terminal units or boxes with reheat coils branch off of the main supply and are located throughout the first floor, serving the individual needs of each space.
INDOOR POOL
The indoor pool on the first floor requires a special ventilation unit to remove excess moisture from the air and provide air conditioning to the space as needed. This unit utilizes recycled energy from the moisture removal process to heat the pool water. An outdoor air-cooled condenser with a capacity of 470 BTU/h supplies this ventilation unit with refrigerant to cool the air.
MECHANICAL/SERVICE AREAS
Similarly, there are two identical outdoor air-cooled condensing units (one at grade, another on the roof) that supply refrigerant to the air conditioning units that serve the mechanical areas on the first floor. The emergency generator requires a large exhaust system (8,650 cfm) that exhausts through a louver at the exterior wall along York Street. An additional system, located in the truck service entrance or dump, provides the necessary exhaust of truck exhaust fumes.