CHAPTER 7 HEATING, VENTILATING, AND AIR …

← Back to document page

TM 5-691 7-1 CHAPTER 7 heating , ventilating , and air -CONDITIONING SYSTEMS ________________________________________ __________________________ 7-1. General heating , ventilating , and air -conditioning (HVAC) design The DOD owns and operates many C4ISR facilities across the nation and abroad, ranging from small computer rooms to large radar facilities. C4ISR facilities often house computer and communications equipment, radar systems, printers, disk and tape drive, monitors, and system consoles all of which generate substantial amounts of heat. To optimize performance and ensure continued operation, the environment containing the electronic equipment must be maintained within stringent temperature and humidity levels. In addition, the comfort needs of personnel required to operate the equipment must be met and the airborne particulate matter effectively filtered from entering the C4ISR room airstream.

The free air return system is the most flexible and the least expensive of the return air ... Typically below 200 tons, reciprocating chillers or rotary screw chillers would be used. TM 5-691 7-4 ... where compressors with four or more stages may be needed, two stage

  Compressor, Free, Screw, Rotary, Heating, Ventilating, Rotary screw, And air, Free air