HVAC Air System

HVAC Air System

  • Zoning of rooms/space within one group to be served by common air conditioning unit(s) due to similarity in rooms/space thermal load, load profile or inside design conditions shall be permit to minimize number of air conditioning unit(s) as possible.
  • Where  rooms/spaces  require  individual  temperature  control    (thermostat)  air  terminal  unit constant air volume or variable air volume boxes shall be utilized.
  • A complete variable or constant air system equipped with air diffusion devises, air terminal units, volume dampers, fire, smoke or combination fire/smoke dampers, blast dampers, support and hangers, duct warp and acoustic lining thermal insulation shall be design and selected to confirm to international standards.
  • Locating  of  air  diffusion  devices  shall  be  coordinated  with  other  ceiling  systems  (lighting, fire/smoke detections, sprinklers ..etc) and shall be based on minimum code distance clearance. Reflecting ceiling drawing(s) for building/facility shall be submitted to ensure fulfillment of code requirements regarding minimum acceptable clearances.
  • All necessary air balancing dampers shall be shown on the drawings, in addition to any general requirements in the specifications.   Test fittings, access holes, and access doors shall be provided where needed for balancing, as well as provisions for measuring and balancing water flows.
  • Proper study to locate air diffusion devices to provide uniform flow of supply, return and exhaust air to and from all spaces/rooms within the building/facility. Selecting proper locations to avoid dead spots, undesired air  draft short circuit of  air flow.  Reference to  room air distribution equipment chapter of ASHRAE Systems and Equipment handbook on for selection guidelines.
  • Outside  air  intakes  shall  be  designed  and  located  to  minimize  dust  and  sand  intrusion considering exhaust outlets and common wind direction. Outside air intakes shall not be closer than 3.0 m to an appliance vent outlet, a vent opening, a plumbing drainage system, or discharge outlet of an exhaust fan.
  • Utilization of heat recovery units in HVAC systems such as between outside air and return air duct by heat pipe or wheel heat recovery shall be utilized to extract thermal energy associated with exhaust air dumped to atmosphere.
  • The Direct Digital Control (DDC) sensors installed inside the ductwork system such as (smoke detectors, temperature sensors….etc) shall be installed based on code requirements and DDC schematic diagram.

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