UFC 4-211-01N
25 October 2004
CHAPTER 6
MECHANICAL REQUIREMENTS
6-1
HEATING. Provide heating in accordance with MIL-HDBK-1003/3 and as
follows:
6-1.1
Infiltration Rate. Design for an infiltration rate of two air changes per
hour in the OH area. This rate is dependent upon the installation of nylon brush
insulation seals on the hangar sliding doors.
6-1.2
Space Thermometer. A switch activated by opening the hangar doors
should override the space thermostat to stop the heating equipment in the OH area.
Provide a minimum temperature thermostat field set at 1C (34F) to override the
heating deactivation switch during door-open periods of subfreezing ambient
temperatures. After the doors are closed, the room thermostat should assume control.
Heating system recovery time should be 60 minutes after the doors are closed.
6-1.3
Snow-Melting System. A snow-melting system at the hangar door
tracks, when sliding hangar doors are used, should be installed when outside design
temperature is -4C (+25F) or lower and historical snow accumulation data supports
the requirement.
6-1.4
Under Floor Heating System. Investigate the use of an under floor
heating system for the OH area when outside design temperature is below 23C
(-10F).
6-1.5
Automatic Thermostatic Control. The automatic thermostatic control
must meet the requirements of MIL-HDBK-1003/3.
6-1.6
Heating Zones. Each module in the OH area should be a separate
heating zone.
6-1.7
Design Conditions. See the facility plates for design conditions.
6-1.8
Cold Jet Destratifiers. Consider the installation of Naval Facilities
Engineering Service Center (NFESC) cold jet destratifiers based on an economic
analysis.
6-2
SYSTEM SELECTION. Give special consideration to the climate of the
geographical region concerned when designing the heating system.
Perform a detailed Life Cycle Cost Analysis and Energy Budget to
determine the most suitable mechanical system alternative. Pay particular attention to
the cost benefits of a steam verses gas supply system, under-floor heating against over-
head radiant heating or unit heaters, and initial, repair and maintenance costs.
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