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a.The heating, ventilating and air conditioning (HVAC) design and specified components shall conform to all applicable codes and regulations. Heating and cooling design loads for purposes of sizing HVAC systems shall be determined in accordance with a recognized computation procedure.
| Season | Inside | Outside | |
| Winter | 72 degrees | 41 degrees F (ASHRAE 0.2%) | |
| Summer | 75 degrees | 84 degrees F db, 66 degrees wb | |
| 95 degrees Condensing Temperature |
c. Minimum outside air rates at design conditions shall be based on the following criteria except where local codes and ordinances are more stringent.
| Office Area | 20 CFM per person |
| Conference Rooms | 20 CFM per person |
| Restrooms | 15 air changes per hour |
| Transformer/Electical Rooms | Exhaust at a rate of 3CFM per SF |
Description of Systems
a. Eight rooftop package AC units with direct expansion cooling shall be utilized to supply cooling air to building. The system will be vertically subdivided with two variable air volume systems and shall be used for all areas with VAV modulation accomplished using variable speed drives. VAV air handling system must be capable of stable operation over 30% to 100% of system CFM. Cooling system equipment shall be sized to condition 30% maximum outside air or sized to allow 10% additional capacity over calculated building load, whichever is greater. There will be two packaged units for each of the four quadrants, ducted vertically through a common shaft for each quadrant.
b. Heating shall be provided through rooftop outdoor gas-fired boilers with hot water circulation pumps. The hot water shall be distributed to heating zones through heating hot water pipes in building and mechanical distribution at each floor.
c. Main supply air shall be looped at each floor within each quadrant to allow either unit or both units to serve the space based on actual demand. Air shall be distributed through VAV terminals. Cooling only zones shall utilize single duct terminals. In heating zones, HW reheat coils shall be included in VAV terminals.
d. Exhaust air fans and distribution ductwork including vertical shafts are to be included to serve all areas such as toilet rooms, janitor closets, vending and break areas, electrical rooms and all other rooms as identified in the "Facilities Requirements and Standards."
e. Ductwork Locations: Except where shown on architectural plans, ductwork shall be exposed and shall be aesthetically compatible with architectural and structural design of the interior space. Main trunk duct runs shall be rigid spiral round or oval construction and shall be located as not to conflict with height/finish requirements, lighting fixtures, sprinkler piping and structural members.
f.. The garage is to be a mechanically ventilated garage. The garage exhaust system is to consist of four fans roof-mounted or in fan rooms within the garage utilizing acoustical louvered intakes to exhaust air to the outside of the building through architectural acoustically lined plenums and discharge openings. The exhaust systems can be propeller fan type or centrifugal fan type depending on their location. The fans are to be activated by a carbon monoxide activation system.
g. Auxiliary Air Conditioning System: An independent rooftop closed circuit cooling tower with pump will be used to provide capacity for the auxiliary air conditioning system for future equipment loads and 24-hour cooling requirements during tenant work. Condenser water risers (supply/return) to be provided with pipes capped at each quadrant of each floor for auxiliary loads and 24-hour cooling ability in the building.
h. Motors: All motors serving fans and pumps to be energy efficient and rated for high efficiency. Fan motors and pump motors will utilize electronic motor speed controllers (VFD).
Temperature Controls and Automation Systems
Building Systems: A direct digital system of temperature controls, as well as an automated program and automation monitoring control system will be provided. Automated temperature control systems will include a Building Management System that will provide computerized control and monitoring of the following building functions:
a. Starting and stopping of all mechanical equipment based upon building operational schedules and temperature conditions.
b. Reset of operating discharge temperatures for hot water and fan system to coordinate operating temperatures with space requirements.
c. Monitoring of all air conditioning operating temperatures to alarm for off-normal conditions.
d. To monitor systems operation based on damper position per floor for after hours use.
e. To control building lighting system.
HVAC Zoning
Air distribution shall be zoned based on the following:
a. Interior open office areas shall be a maximum of 2000 square feet per zone.
b. Perimeter open office areas shall be a maximum of 1200 square feet per zone.
c. Closed single occupancy interior offices shall have no more than six offices per zone.
d. Perimeter single occupancy exterior offices shall have no more than five offices per zone on any exposure.
e. Corner offices, large conference rooms and break rooms shall be on individual zones.
Energy Conservation Features
a. Economizer Cycle
Vary the percentage of outside air and return air based on outside air temperature. Outside air will range from a minimum of approximately 30% for ventilation to a maximum of 100% when outdoor condition permit the use of air for cooling. This will lower energy consumption by reducing cooling demand.
b. Supply Air Temperature Reset
The supply air temperature reset would automatically reset the 55° temperature off the cooling coil upward on the zone requiring the most cooling.
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