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NC-2009 IEQp1:Minimum IAQ Performance

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Hi All, we are trying to file compliance for both IEQ P1 & C 1,it would be great if someone could help me clarify on the below: 1)if a meeting room is served by a dedicated FCU; Does the meeting room require both the airflow measurement device as well the CO2 sensors or just the CO2 sensor will do? 2) We have CO2 sensors in the return air duct that modulate the airflow based on occupancy. When there is less/no occupancy if modulates the damper to close In order to save energy. Now when we program the airflow device serving the same space to maintain a minimum airflow, it does not complement each other. As airflow devices are programmed to maintain a minimum airflow even with no occupancy. How to resolve this?

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Wed, 05/27/2015 - 20:29

I can hep you with (1): If your meeting room is mechanically ventilated, then you need to install an airflow measurement device in the duct providing outdoor air. If your meeting room is naturally ventilated, then the CO2 sensors will do. For (2) I would say that you can use your demand controlled ventilation instead of the airflow measurement device required by the credit. Since this is out of the credit requirements, I would submit an inquiry through the USGBC web-site for your particular case.

Thu, 05/28/2015 - 09:37

Hi Gustavo, Thanks for the comments. We have a project where some area are served by AHU's and some areas served by constant flow FCU's with individual outdoor air supply fans. Now we are providing airflow measurement device for all AHU's. Since the number of FCU's are quite many & are constant volume, can we just provide CO2 sensors within the rooms for all spaces served by FCU? instead of airflow measurement device (including non-densely occupied zones)so that we are in compliance with both IEQp1 & IEQc1.

Thu, 05/28/2015 - 21:55

Hi Stella, I guess your concern is about the cost associated with installing many measuring devices. We usually drop this credit when there are many outdoor air fans. However, if you read carefully the credit you only need to install this device "for mechanical ventilation systems where 20% or more of the design supply airflow serves nondensely occupied spaces".

Fri, 05/29/2015 - 01:24

Hi, The concern is not the cost rather the use of the Airflow stations; the FCU’s are constant flow and doesn’t have any damper to modulate the airflow, even if there is an alarm by the AFS. Hence I don’t see the point of installing one. To answer your question, the FCU’s servers non densely occupied zones as well. So I would rather put in a CO2 sensor within the room to generate the alarm. Please advice.

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