Mechanical Systems

Mechanical Highlights: Office Floors: Cooling air has been provided from floor compartment style variable air volume air conditioning units located in a core mechanical room on each floor. Each unit has been equipped with fan, chilled water cooling coil, air filters and appropriate sound attenuation. Compartment units are provided with variable speed drives for volume modulation under control of duct static pressure. A two way control valve on the chilled water supply to the compartment unit cooling coil will modulate to maintain the desired air supply temperature. The ceiling cavity form a return plenum with return air vented from the office space through openings in the base building light fixtures and return air grills. A CO2 detector is located in the return air path at the opening to the compartment room to control an outside air constant volume controller located on each compartment room outdoor air damper. Outdoor air is filtered, heated and humidified or cooled and dehumidified to provide tempered air supply to each compartment unit. The total outdoor air supply is variable in volume in order to meet the need of occupied floors only.

Heating and Humidification Systems: A central natural gas fired heating plant is located in the penthouse mechanical room on L45. The plan is used to provide heated water from a primary circuit to typical floor perimeter heating, air handling units, as well as building fan coils and unit heaters. Primary heated water, mixed with return water from the typical floor risers will serve plate and frame  heat exchangers for ventilation  air handler pre-coils. Humidification requirements are supplied by steam dispersing in the ventilation (makeup) air unit supply air stream. Two gas fired low pressure steam boilers are located in the penthouse mechanical room and are complete with water softener, bleed–off and cool-down tanks and accessories.

Ground Floor Lobby: An air conditioning unit located above the Lobby area is able to deliver 100% outside air to the ground floor entrance lobby. The air delivery to the lobby is sufficient to provide required cooling. Space heating is accomplished by perimeter fan coil units as well as by heating in the supply unit.

Ventilation systems: Each floor has been provided with washroom and general exhaust ventilation systems designed to expel air from each floor. Up to 90% of the outdoor air supply quantity is removed to result in a net positive pressurization of each floor during normally occupied periods.

Supplementary Cooling and Heating Requirements: Elevator machine rooms, POP, telephone and communication rooms, and fire control rooms are mechanically cooled with Chilled water. All non-air conditioned interior building spaces are heated with thermostatically controlled hydronic unit heaters, convectors and wallfin radiation.

Plumbing systems: Separate street water supplies serve the domestic water and fire service. A rain water cistern is used to collect storm water from the building. The flow is filtered for use in irrigation of landscaping and for flushing toilets and urinals in the low rise portion of the building. Domestic cold water has been supplied from a booster pump set located in the mechanical room. Distribution has been provided on each floor to washroom fixtures. Domestic hot water has been supplied to each floor lavatories by under-counter mounted instantaneous electric hot water heaters located on each washroom. Plumbing fixtures are provided to meet the low water consumption.

Diesel Generator Fuel Oil system: Four double wall fuel oil storage tanks are provided with a minimum of 24 hours duration of continuous supply to 100% load capacity of the bi-fuel diesel generator. Duplex fuel oil pump sets, on emergency power, are provided to move oil to the generator day tanks sized for two hours of storage. Oil returned from the generators to the day tank will be return to the main oil storage tank. Exhaust stacks complete with a muffler system are provided from generator discharge to the building exterior.

Controls and Monitoring: An automatic electronic building control and monitoring system (BCS) is incorporated as part of the overall strategy of controlling energy consumption, environmental comfort and related costs. The ECMS is an independent LAN based Direct Digital Control ( DDC) system designed open protocol technology. All programming have operator adjustable parameters and is capable of trending to permit fine tuning by building operators based on operational experience.

Process Piping: Systems installed were the following: High & Low pressure steam, Hydronic heating, Glycol Heating & cooling, Chilled Water, Domestic water, Compressed Air, Natural Gas, and Fuel Oil.