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3.8.1.1.1 Variable Air Volume Systems include a central package air
handler which utilizes chilled water, and hot water coils, package
chiller and boilers, and VAV boxes with reheat. If a chilled water
system cannot be justified by life cycle costs, air-cooled condensing
units may be used.
3.8.1.1.2 Split Systems include fuel-fired furnaces with condensing
units or small air 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 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 3-600-01; Design Engineering Construction for weather data.
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. TM-5-805-4 provides design
guidance for controlling noise and vibration.
UFC 4-171-05
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