Hello,
my project is a campus golf course community project in Qatar. One of the buildings in the master site, the clubhouse, is mixed-use: part hotel, part retail, part restaurants etc. In all areas of this building, except the banquet hall, a constant volume system is used. There will, most probably, be sensors to measure the status of the fans and pressure. Is this sufficient for compliance, at least, in those areas of the building? In the banquet hall, variable air volume is being supplied. Therefore, CO2 sensors will also be installed. Also there will be VAV boxes with a flow grid that measures both the fresh air intake and recirculated air. Is this approach acceptable?
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Andrew Mitchell, P.E.
PrincipalMitchell Gulledge Engineering, Inc.
LEEDuser Expert
126 thumbs up
September 19, 2013 - 11:00 am
Under LEED 2009, there is no provision to monitor only fan status for this credit for CV systems. OA flow needs to be measured on its own.
Kathryn West
LEED AP BD+C, O+M, Green Globes ProfessionalJLL
154 thumbs up
October 1, 2013 - 10:27 am
Have you looked at LEED Interpretation #2099? The CIR is asking if current transducer (CT) monitors are adequate devices to monitor outside air delivery. For a constant volume 100% outside air system similar to the one described by the proponent, the CT approach may satisfy the credit requirement for a direct outdoor airflow measurement device, provided the CT device has been properly calibrated during the installation and commissioning process. Properly calibrated, the CT device would alert the BAS to a change in the fan status, which would indicate a change to the amount of outside air being delivered. In order to satisfy the credit requirements the submittal must show how the CT has been calibrated, and must outline the monitoring sequence. If the system is not 100% outside air, or not constant volume, the CT device would not be adequate.
Andrew Mitchell, P.E.
PrincipalMitchell Gulledge Engineering, Inc.
LEEDuser Expert
126 thumbs up
October 1, 2013 - 2:31 pm
Kathryn, I am aware of that interpretation and I have used it to achieve this point on projects in my office. The original comment did not mention the use of 100% OA units, but does mention recirculated air. The CIR will not apply to CV mixed air units. If there is a 100% OA unit then Mr. Jaffar should clarify. Thanks for adding this though.