CHPS 2: Dedicated Outdoor Air System

CHPS EQ C1.1.3 DOAS (Dedicated Outdoor Air System)

Traditional HVAC systems recirculate air, which may contain toxins from materials found within the building, as well as carbon dioxide (CO2), potentially affecting student and teacher health and performance. With a DOAS system, outside ventilation air is consistently delivered to each space, providing better indoor air quality. With the addition of an energy recovery system, energy used to condition outdoor air is reduced by at least 50%. This allows the overall system to save money and energy consumption, while improving occupant well-being.

Additional Energy Saving Measure

Another energy saving measure for the DOAS is that as the room population decreases so do the CO2 levels (humans exhale CO2). When the CO2 level decreases, the fan delivering air to the space slows down and the energy needed to drive the fan decreases, saving more energy. Additionally, traditional HVAC systems typically supply and recirculate air at the ceiling level. The DOAS system delivers fresh air lower to a room in the human breathing zone. This means the DOAS  system delivers more usable fresh air than traditional methods.