Dedicated Outdoor Air
Select a unit to view specific design options
LASER-PL
LASER-PL-PL (Flat Plate & Flat Plate HX)
LASER-WH-PL (Heat Wheel & Flat Plate HX)
LASER-WH-WH (Heat Wheel & Heat Wheel)
Innovent offers a broad range of ventilation unit options suitable for use in Dedicated Outside Air Systems (DOAS)
What is a Dedicated Outside Air System?
- Decoupling the building latent and sensible loads
- Remove latent loads generated from the ventilation air (and in the space) using 100% OA units
- Remove space sensible loads using parallel mechanical cooling systems independent of the OA equipment
- Control temperature & humidity independently
- A separate unit used to condition ventilation air
Drivers of DOAS
- LEED
- Green building design
- ASHRAE Advanced Energy Design Guides
- ASHRAE 189.1
- ASHRAE 90.1 (energy recovery)
- ASHRAE 62.1 (ventilation)
- Dr. Stanley Mumma (http://doas-radiant.psu.edu/)
Why use DOAS?
- The high ventilation rates required by ASHRAE 62.1 increase the cooling load required for all equipment
- Mixed air systems are not designed to handle high latent loads
- Mixed air systems cannot adequately dehumidify the air in warm & humid climates
- VAV systems make it difficult to guarantee compliance with 62.1 in all zones
- Humidity fluctuates on part load days with non-DOAS systems
DOAS Advantages
- Separately conditioning the outside air avoids imposing loads on local HVAC units which are not designed to handle them
- Improves operating life of all equipment
- Space temperature and humidity are maintained at ALL operating conditions
- Better dehumidification is achieved due to reduced compressor cycling (ventilation coil stays wet)
- A verifiable amount of ventilation air is delivered to all spaces
DOAS Applications
- DOAS should be used to ensure compliance with ASHRAE Standard 62.1
- DOAS should be used to maintain a comfortable & healthy space year round for all building occupants
- DOAS should be used in any high occupancy / ventilated spaces using centralized equipment
