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Dedicated Outdoor Air System
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Dedicated Outdoor Air System

April 28, 2011


DOAS (Dedicated Outdoor Air System) is as an excellent choice for treating outdoor air. It removes all the latent load being brought in by the outside air at the source and processes the same to a very low dew point thereby enabling it to take care of the rest of internal latent load.

Depending on different geographical reasons & several other considerations various DOAS have been configured, designed & developed. The authors have been continuously studying & developing different configurations for a DOAS by using one or more of the following:-

  • Enthalpy wheel
  • Cooling Coil
  • Active dehumidification wheel
  • Passive dehumidification wheel
  • Sensible Wheel
  • Evaporative Cooling Pads

DRI’s cutting edge R&D has resulted in the development of the ULTIMA DOAS which allows designers to provide ultimate fresh air ventilation as a single source responsibility.

  • DOAS allows designers the DAQ (Divide and Conquer) approach in which DOAS takes care of the fresh air and internal latent load. The parallel system takes care of the internal sensible load.
  • Unitary System – single point responsibility to provide Dry Cool Fresh Air in an energy effi cient manner
  • Constant Supply Air conditions throughout the year
  • Intelligent microprocessor controlled DRISMART EMS (Energy Management System)
  • Applications include chilled beams and parallel systems (which separately cater for internal sensible load)
  • Helps obtain substantial LEED points

How does the ULTIMA work?

The new DOAS is a unitized Fresh Air Management System integrated through a unique configuration of EcoFresh Heat Wheel, a cooling coil and the innovative G3MA “Passive” desiccant dehumidification wheel (patent pending) and a proprietory controlled embedded logic in the DRISMART EMS.

Ultimate for

  • The “Moisture Centric” tropical countries.
  • Achieves both RH control and energy recovery.


Ideal for

  • Office Spaces / IT Offices
  • Hotels / Hospitality
  • Hospitals / Health Care Facilities
  • Commercial Spaces / Malls
  • Substaintial Green Building LEED Points for
    • Energy saving (55%) approx
    • Improved IEQ
    • Innovative new technology

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