Mechanical Requirements

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Figure 4 Trench Plate Arrangement

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Aircraft Maintenance Facilty Design

Mechanical Equipment Requirements

MECHANICAL REQUIREMENTS

Heating

Heating shall be provided in accordance with MIL-HDBK-1003/3 and as follows:

a) 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.

b) 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 1 degree C (34 degrees F) 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 30 minutes

after the doors are closed.

c) A snow-melting system at the hangar door tracks, when sliding hangar doors are

used, should be installed when outside design temperature is -4 degrees C (+25 degrees F) or

lower and historical snow accumulation data supports the requirement.

d) The use of an under floor heating system should be investigated for the OH area

when outside design temperature is below -23 degrees C (-10 degrees F).

e) The automatic thermostatic control shall meet the requirements of MIL-HDBK-

1003/3.

f) Each module in the OH area should be a separate heating zone.

g) See the facility plates for design conditions.

Consider the installation of Naval Facilities Engineering Service Center

(NFESC) cold jet destratifiers based on an economic analysis.

System Selection

Special consideration shall be given to the climate of the geographical region concerned when

designing the heating system.

A detailed Life Cycle Cost Analysis and Energy Budget shall be performed to determine the

most suitable mechanical system alternative. Particular attention should be paid 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 should also be carefully

considered.