A DOAS brings 100% outdoor air through a dedicated unit, separate from the space conditioning system. Because the outdoor-air fraction is large, an air-to-air exchanger is almost mandatory for efficiency.
Why recovery is essential here
- DOAS airflow is the full ventilation rate, the exact stream an ERV recovers from.
- Without recovery, conditioning that air dominates energy cost.
- With recovery, DOAS delivers excellent IAQ at reasonable cost.
Configuration
Match the ERV to the DOAS design airflow and climate, enthalpy in humid regions, sensible where moisture swing is small. See the ERV guide and code requirements.
Specifying a unit for your project?
EN159 builds plate, rotary, heat-pipe and counterflow air-to-air exchangers for DOAS and AHU duty. Send airflow (m3/h), inlet temperatures and available space and we will size it.
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