Dedicated Outdoor Air Systems (DOAS) use separate equipment to condition all of the outdoor air brought into a building for ventilation and deliver it to each occupied space, either directly or in conjunction with local or central HVAC units serving those same spaces.

A DOAS unit can be simple, with just a few components (e.g., a fan and a cooling coil), or more complex, with several energy recovery devices, cooling coils, heating coils, and one or more fans. Generally, the objective of a DOAS is to condition incoming outdoor air before it mixes (and is diluted) with the remainder of the building so that it is easier to dehumidify and clean, and so that energy in outgoing air can be recovered to precondition incoming outdoor air.

Dedicated Outdoor Air Systems

Where are DOAS systems used?

A DOAS can be effectively incorporated into nearly any commercial, institutional, industrial, or multifamily building. Although all building types can benefit from DOAS, those with strict requirements for indoor air quality, ventilation, humidity, or energy efficiency make particularly good candidates.

Following are the supported systems that have a DOAS unit:

  1. DOAS w/FCU, with ASHP and Air Cooled Chiller

  2. DOAS w/FCU, with ASHP and Water Cooled Chiller

  3. DOAS w/FCU, with ELectric Boiler and Air Cooled Chiller

  4. DOAS w/FCU, with Electric Boiler and Water Cooled Chiller

  5. DOAS w/FCU, with Electric Resistance and Air Cooled Chiller

  6. DOAS w/FCU, with Electric Resistance and Water Cooled Chiller

  7. DOAS w/FCU, with GSHP

  8. DOAS w/FCU, with Gas Boiler and Air Cooled Chiller

  9. DOAS w/FCU, with Gas Boiler and Water Cooled Chiller

  10. DOAS w/Induction, with ASHP and Air Cooled Chiller

  11. DOAS w/Induction, with ASHP and Water Cooled Chiller

  12. DOAS w/Induction, with ELectric Boiler and Air Cooled Chiller

  13. DOAS w/Induction, with Electric Boiler and Water Cooled Chiller

  14. DOAS w/Induction, with Electric Resistance and Air Cooled Chiller

  15. DOAS w/Induction, with Electric Resistance and Water Cooled Chiller

  16. DOAS w/Induction, with GSHP

  17. DOAS w/Induction, with Gas Boiler and Air Cooled Chiller

  18. DOAS w/Induction, with Gas Boiler and Water Cooled Chiller

  19. DOAS w/Radiant, with ASHP and Air Cooled Chiller

  20. DOAS w/Radiant, with ASHP and Water Cooled Chiller

  21. DOAS w/Radiant, with ELectric Boiler and Air Cooled Chiller

  22. DOAS w/Radiant, with Electric Boiler and Water Cooled Chiller

  23. DOAS w/Radiant, with Electric Resistance and Air Cooled Chiller

  24. DOAS w/Radiant, with Electric Resistance and Water Cooled Chiller

  25. DOAS w/Radiant, with GSHP

  26. DOAS w/Radiant, with Gas Boiler and Air Cooled Chiller

  27. DOAS w/Radiant, with Gas Boiler and Water Cooled Chiller

  28. DOAS w/VRF, with Electric Boiler and Cooling Tower

  29. DOAS w/VRF, with Gas Boiler and Cooling Tower

  30. DOAS w/VRF, with Ground Source

  31. DOAS w/WSHP, with Electric Boiler and Cooling Tower

  32. DOAS w/WSHP, with Gas Boiler and Cooling Tower

  33. DOAS with VRF

Related Articles:

  1. Updated system types

  2. Fan Coil System

  3. Induction System

  4. VRF

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