MIL-HDBK-1191
normally competitively bid, the designers must assure that space
envelope requirements are provided based on worst-case analyses of
equipment from a minimum of three manufacturers. Plan and elevation
views showing coordinated equipment and space envelopes shall be
included in the required design submissions.
19.3.3
Utility Distribution Considerations. The length and
complexity of utility distribution runs should be reasonably minimized
to avoid unnecessarily high flow resistance with resulting additional
energy consumption, larger duct and feeder sizes, and loss of future
flexibility. When practicable, avoid routing utility feeders through
areas they do not serve in order to minimize the impact and complexity
of future facility modifications. Service isolation and balancing
devices, and terminal equipment, that may require periodic inspection
or maintenance should be located above corridors.
19.3.4
Distribution and Terminal Equipment Space Requirements.
The designers shall assure that distribution and terminal equipment can
be installed in the spaces indicated, including above-ceiling spaces,
distribution spaces, chases, etc. This requires thorough coordination
of all equipment with the architectural and structural features of the
building. To assure that installation is possible, the designers shall
plan distribution space requirements on the basis of sizing
calculations and the worst-case joining, reinforcement and support
conditions permitted by the design. The designers are particularly
cautioned to carefully consider the vertical space requirements of
sloped gravity piping services. The designers must also be aware of,
and provide for, code-mandated dedicated space requirements above, and
adjacent to, electrical panels and equipment.
19.4 IBS Systems Module Design Concepts. IBS Systems Module design
concepts, as discussed below, are normally only economically
practicable for larger or more complex facilities. Systems Module
design locates the majority of utility distribution and terminal
equipment on interstitial walk-on decks, thus permitting convenient
installation and maintenance. A candidate project for Systems Module
design shall be evaluated during initial design by an economic
comparison with conventional design. All costs associated with
acquisition, operation, maintenance and alteration for a period of 25
years, or the designated life of the proposed building, shall be
included in the comparison.
19.4.1
Systems Module. The Systems Module, a designated unit of
space one story in height, is the basic building block of a Systems
Module building, i.e., the building is composed of separately
identifiable Systems Modules each consisting of a utility pod, a
distribution zone, a connection zone and an occupied zone. Each
Systems Module is served by its own utility distribution systems. The
relationship of the various zones is illustrated in Figures 19-1 and
19-2. Systems Modules should range in area from 930 to 2090 m2 (10,000
to 22,500 ft2). Although there is a spatial discipline associated with
the Systems Module, the overall organization and massing of a building
can be varied according to specific project requirements. Repetitive
Systems Modules will allow both expanded forms to accommodate the need
for a day-lighting/solar approach or compact forms to allow a closed
approach that attempts to negate the effect of climate. These forms
are illustrated in Figure 19-3. In multistory buildings the utility
19-2
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