83
3.8.2 Provide mechanical ventilation that allows the buildings to
conform to sustainable design standards. Assembly Hall, Classrooms,
Reading Rooms, Conference Rooms, Physical Training, etc... will
have widely varying occupancy rates during occupied periods. It also
appears that pollutants in these spaces, and therefore the outside air
requirements in these spaces, will be directly related to the number of
occupants. Controlling the amount of outside air based on CO2
sensors can be very effective in these cases saving significant amounts
of energy while ensuring a healthy environment for the occupants.
Suggest that CO2 sensors be considered by the designer for these
spaces in coordination with the user and maintenance staff. It also
appears that many of the offices and similar spaces will be occupies
only part of the time the building is occupied. The designer, in
coordination with the user and maintenance staff, should consider
occupancy sensors for those spaces to control both the lights and to
reset the terminal units to an unoccupied setting
3.8.3 Provide automatic temperature controls for maintaining
occupied and unoccupied temperature conditions. Use temperature
Figure 3-11
controls with setback and time-of-day provisions that allow building
Janitor's Closet
temperatures to drift during unoccupied hours. Provide protective
shields for sensors and thermostats in exposed areas. Apply DDC
(direct digital controls) to VAV (variable air volume) and other
multiple zone systems used on larger (over 1000 sq m) buildings.
Provide an emergency HVAC shutoff switch accessible to building
occupants that will shut down air handling systems to limit distribution
of airborne contaminants.
3.8.4 Zoning and System Considerations: emphasize the occupancy
profile for various areas of the building when analyzing systems.
Where possible, isolate part-time occupancy areas from full-time
occupancy areas to reduce energy consumption. Allow unoccupied
zones to drift to the unoccupied space temperature limits. Make
provisions to introduce mechanically conditioned ventilation air only
during the occupied hours for each zone. Ventilation requirements
listed in individual space criteria are minimums. Humidification systems
are not required. Dedicated dehumidification systems are required
only in arms storage vaults. Base additional design decisions on the
recommendations stated in the latest editions of the American Society
of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE)
Guide and Data Book.
3.8.5 Provide dedicated mechanical room space for floor-mounted
equipment. Access doors must be lockable. Include adequate space
for the equipment, duct and piping connections, removal and
replacement access, and manufacturer's recommended service
UFC 4-171-05
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