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 MIL-HDBK-1012/1
Shielding. Shielding shall be used as required for the individual
8.10.4.9
case. Where shielding is used, the criteria governing permanent electronic
facilities shall be observed.
8.11
Automatic Data Processing Centers. The automatic data processing
(ADP) center provides computer-oriented information processing and display
systems. The ADP center support all Naval Shore systems and assigned ship
systems in all matters requiring digital, stored-program computers. In
addition to computers, the ADP center contains the peripheral devices required
to form a complete system. Its functions include processing, displaying, and
transmitting data for data collection, data distribution, inquiry processing,
computer time-sharing, and message switching. Details of system needs will be
set forth in a BESEP, or by the user command. For further information, refer
to NAVELEX 0101,111, Digital Computer Systems. Vol I of II.
8.11.1
Architectural and Structural. In addition to the general
requirements of Section 3, data processing facilities shall comply with the
following:
8.11.1.1 Configuration. In addition to the computer room, the data
processing center shall include a data storage room a data base office, a
tape/disk library, keypunch room office space, and a production control room.
The design should provide for future expansion.
Floors.
8.11.1.2
Raised floors shall be used in computer areas.
Mechanical. Basic design criteria are provided in Section 4. The
8.11.2
criteria in this paragraph are directed toward larger computer facilities
classified as data processing centers. Although the criteria primarily apply
to areas housing the computing equipment, ancillary spaces, including storage
areas for magnetic disks and tapes, punch cards, and paper require similar
environmental control. Tolerances for ancillary areas are wider, however, and
environmental control system reliability is not as critical.
8.11.2.1 Design Criteria. Most manufacturers recommend that the computers
use room air for cooling. Normally, a room condition of 72
2 degrees F
(22.2
1 degrees C) and 45
5 percent RH is provided where the
latent/sensible ratio of the load requirement matches that of the coil
performance giving the optimum economic performance. Some manufacturers,
however, require that cooling air be introduced directly to the machine.
Generally, this requires a supply air temperature of about 65 degrees F (18
degrees C) and a relative humidity of 40 to 65 percent to avoid condensation
within the equipment. This will in turn require that reheat tempering of the
supply air is necessary. This can double the required cooling capacity,
unless waste heat is used for the purpose and is not a recommended design.
8.11.2.2 Cooling Loads. Information on the heat release of the computing
equipment must be obtained from the BESEP or from the computer manufacturer.
Because of the relatively low occupancy and the small percentage of outside
air, heat gains in computer rooms are almost entirely sensible. As a result
of this and the low room design conditions, the air circulation rate per ton
of cooling normally must be higher than the circulation rate for comfort
cooling. The high rate of heat release from computer results in a high load
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