Associated Air Products DOAS
What is a DOAS?
A dedicated outdoor air system is an HVAC unit that is installed inside or outside and is often used with other HVAC equipment. DOAS units bring fresh outside air into interior spaces independently from heating or cooling efforts. The unit maintains a constant temperature and humidity of the supplied air. Addressing ventilation and air conditioning separately can save fan energy while improving indoor air quality.
What Equipment is Used with a DOAS?
The type of equipment used with a DOAS may vary depending on brand name and building type. In some instances, a chilled water network is employed to supply the DOAS cooling coils with cold water. 4 Other DOAS models may utilize digital scroll compressors, a microchannel condenser coil, and an electric expansion valve to heat, cool, and dehumidify air. Some will have an integrated ERV section.
Why Use a DOAS Unit?
While dedicated outdoor air systems could help businesses comply with new commercial HVAC energy efficiency standards, there are a host of other benefits as well:
- They improve indoor air quality by removing contaminants from outdoor air before channeling it into a building.
- DOAS units are effective dehumidifiers, and they help prevent moisture-related problems like sick building syndrome and mold growth.
- Decoupling ventilation from air heating and cooling can also lead to energy savings.