UFC 4-171-05
1 January 2005
with change 25 October 2006
handlers with condensing unit/heat pumps. These are normally single zone units.
3-8.1.1.3 Fan Coil Units Systems can be used for multizone situations in lieu of VAV
boxes. This system requires central chiller and boilers and piping systems feeding the
fan coil units in each zone.
3-8.1.1.4 Vehicle maintenance bays are normally served by either fuel-fired infrared
heaters or fuel-fired forced air unit heaters. In climates with more than 5000 heating
degree days, in-floor hot water heat with fuel-fired infrared heaters is the standard.
3-8.1.1.5 Kitchens are normally served by a rooftop makeup air unit and cooled by
either a packaged cooling rooftop unit or by a central VAV system.
3-8.1.2 It is standard practice to apply DDC controls to Army Reserve building
projects. The size of the projects are generally such that digital controls are warranted
for energy savings. Off-Post facilities, buildings not intended to be connected to EMCS,
and facilities where the user specifically directs the design, are facilities where DDC is
permitted to be used and must be decided on a case-by-case basis. MDS utilizes a
generic specification which describes performance as well as product requirements.
3-8.1.3 Select and design mechanical systems in accordance with UFC 3-410-01FA.
For weather data use UFC 3-400-02 and other "authoritative sources of weather data
and tapes." Also note that compliance with Executive Order 13123 requires purchase of
products with an energy efficiency of the upper 25% available. Use mechanical
ventilation to meet the building s cooling requirements when practical. Consider the use
of heat recovery equipment in areas with high ventilation requirements. Size pipes and
ducts using industry standard friction rates and velocities. Design ducts and piping with
smooth transitions to reduce friction losses. Specify insulation thickness to meet
applicable energy efficiency standards. \ UFC 3-450-01 /2/ provides design guidance
for controlling noise and vibration.
3-8.2
Provide mechanical ventilation that allows the buildings to conform to
sustainable design standards. This includes applying the latest version of
ASHRAE Standard 62.1. 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
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