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If my project is using air handlers that supply 100% outside air at a constant volume, do I still need to install an airflow monitoring device?

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CI-2009 IEQc1:Outdoor Air Delivery Monitoring

100% OA VAVs

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Jeremy Kuhre
Sustainable Buildings & Operations Manager
Sustainable Solutions Corporation
LEEDuser Basic Member
33 thumbs up

We are remodeling two floors of a high-rise office tower. A 100% OA VAV introduces OA into the mechanical room for each floor where it is mixed with return air. An AHU in each mechanical room distributes the mixed air to the floor using a VAV system. With this arrangement, I want to confirm that installing an air flow monitor on the two OA VAVs (or simply showing that the fan is "on" per LIR #2099) and installing CO2 sensors in all densely occupied spaces fulfill the monitoring requirements of this credit.

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Ante Vulin
Sustainability Manager
YR&G
LEEDuser Basic Member
55 thumbs up

Mon, 06/03/2013 - 19:17

The system you describe is not a 100% OA CV system as specified in CIR #2099, so a "fan on" sensor or transducer is not appropriate. For the configuration you describe, the ventilation rate can potentially be determined through monitoring of return, outdoor and mixed air temperatures (before the coil) as well as supply air flow.

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