Schools 2009 IEQc1: Outdoor Air Delivery Monitoring

  • Outdoor Air Delivery Monitoring requirements diagram for NC, CS, Schools, and CI

  • Fresh air and energy savings

    Outdoor air delivery monitoring ensures that the ventilation system, whether natural or mechanical, provides enough fresh air to occupants. The credit  requires carbon dioxide (CO2) and outdoor airflow monitors that signal when fresh air is needed according to minimum set points defined by ASHRAE 62.1-2007. Typical ventilation design (without monitors) tends to encourage increased ventilation that may result in increased energy use and added cost for conditioning increased amounts of outside air. However, the addition of sensors and monitors allows ventilation to be delivered on demand only when required, potentially saving a lot of energy during unoccupied hours in spaces with varying occupancy.

    Good for buildings with varying occupancy rates

    For...

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2 Comments

Erik Bergstrom Green Building Associate Apr 28 2010

CO2 Monitors in Non-Densly Occupied Spaces

Can Co2Carbon dioxide sensors be used in lieu of airflow monitoring for non-densly occupied spaces?

Post a Reply

Gunnar Hubbard, AIA, LEED AP BD+C replied Apr 29 2010

If the HVAC systems have limited capabilities to provide OA monitoring system then CO2Carbon dioxide differential monitoring is acceptable. There are few conditions that the design has to meet. CO2 sensors should be located in all the spaces and and a CO2 sensor on the OA intake. The CO2 differential between the OA CO2 and the space CO2 cannot exceed 530 PPMParts per million.. If it exceeds then the system should be capable of increasing the ventilation rate in the spaces to bring down the CO2 differential below 530 PPM. If the design can meet the above criteria then CO2 sensors can be used in lieu of air monitoring system.

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